Horticulture Principles and Practices

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8.11.9 LANDSCAPE PESTS AND THEIR CONTROL A selected number of landscape pests and their means of control are presented in Table 8–6. TABLE 8–6 Pest Common Landscape Pests and Control Description and Suggested Control Lawn Pests Ants Chigger Billbug Armyworm Sod webworm Japanese beetle Leaf bug Inhabit the soil in nests and destroy vegetation, leaving denuded spots in the lawn; their mounds are unsightly Control: Drench nests with pesticides (e.g., diazinon, Sevin, and malathion) Also called red bug, it is the larval stage of a small mite; it sucks sap from stems and causes stunted growth Control: Apply insecticide dusts and sprays (e.g., durban, Sevin, and diazinon) Also called a snout beetle, it damages the roots and crowns of grasses Control: Apply diazinon or carbaryl Feeds on stems and leaves Control: Apply diazinon or carbaryl Also called a grass moth; as it feeds, it spins threads that bind soil and leaves into tubelike structures on the soil surface Control: Spray carbaryl, aspon, or diazinon Destructive in both larval and adult stages; destructive also to trees, fruits, and other ornamentals Control: Apply diazinon Damaged leaf shows yellow dots initially and eventually yellows and dies Control: Apply malathion or diazinon General Landscape Pests (Annuals, Perennials, Trees, and Shrubs) Aphid Caterpillar Borer Beetle Mite Gall Scale Sucking insect found on the underside of leaves; causes puckering or curling of leaves; it secretes honeydew that attracts other pests (e.g., flies, mites, and ants) Control: Apply orthene, diazinon, or malathion Larva of many insect pests (e.g., cankerworm, gypsy moth, eastern tent caterpillar, webworm, California orange dog, and sawfly) feed on the foliage of landscape plants Control: Use diazinon, Sevin, or orthene Larvae of certain insects (e.g., peach twig borer and other wood borers) damage flowering fruit trees and other ornamental trees Control: Apply dimethoate, bendiocarb, or lindane Adult and larva may inflict damage to plant foliage Control: Apply methoxychlor or carbaryl Presence characterized by discolored patches on leaf as a result of feeding (sucking) from underneath the leaf; affected plants are less vigorous and may eventually brown and die Control: Apply dicofol, malathion, or kelthane May occur on stems, branches, twigs, or leaves; leaf galls usually cause less damage, being primarily unsightly and reducing aesthetic value Control: Apply carbaryl, diazinon, or malathion Scale insects overwinter as eggs or young. They may be armored or unarmored according to scale characteristics. They suck plant juice by using their piercing mouthparts. Control: Apply dormant oil, acephate, or carbaryl 8.11 Insecticides and Their Use 269
SUMMARY Chemicals used to control insect pests are called insecticides. On the basis of killing action, they are classified as contact poisons, stomach poisons, systemic insecticides, fumigants, repellents, attractants, and those that kill by suffocation. Active ingredients of insecticides may be organic or inorganic. Organic insecticides may be created from natural or synthetic compounds. Synthetic organic compounds have several classes: chlorinated hydrocarbons (e.g., DDT), organophosphates (e.g., malathion), carbamates (e.g., Sevin), pyrethroids (synthetic pyrethrins), and others. Insecticides may be formulated as dusts, wettable powders, emulsifiable concentrates, granules, or aerosols. Insecticide applicators vary in size from handheld to aerial sprayers. MODULE 4 CHEMICAL CONTROL OF PLANT PESTS: HERBICIDES OVERVIEW Herbicides are chemicals used to control weeds. Chemicals are the method of choice in killing weeds in large-scale plant production operations. Although their use facilitates plant production, the collateral damage to the environment and health hazard they pose to humans often detract from their role in agricultural production. Herbicides are also convenient for controlling weeds in the landscape and along railroads and highways. They work by interfering with the metabolic processes of the plant. The challenge in their design and application is to minimize damage to cultivated plants while killing unwanted plants. Indiscriminate use of herbicides should be avoided. Certain chemicals are restricted for use by professionals (licensed or certified applicators). As with all toxic chemicals, strict adherence to the directions for their safe use minimizes the danger to the health of humans and cultivated plants. 8.12 CLASSIFICATION OF HERBICIDES Herbicides may be grouped in one of several ways—by selectivity, how they kill (mode of action—by contact or systemic [translocation]), timing of application, and chemistry. 8.12.1 SELECTIVITY On the basis of selectivity, there are two types of herbicides: selective and nonselective. Selectivity The ability of a pesticide to kill some pests and not others without injuring related plants or animals. Selective Herbicides True selectivity is achieved when an herbicide applied at the proper dose and timing is effective against only certain species of plants but not against others. Selective herbicides are designed to kill only certain plants without harming others. Generally, they are designed to discriminate between broadleaf and narrowleaf (grasses) morphologies. Selective herbicides are the most widely used because most situations require only certain plants to be killed but not others. For example, in lawn (grass), broadleaves of any kind are not desired. Broadleaf weeds such as dandelions and wild mustards can be safely eliminated by spraying the lawn with a selective herbicide such as (2,4-dichlorophenoxy acetic acid), which kills only broadleaf plants. Certain chemicals can be manipulated to be selective by changing the concentration at which they are applied. At a high rate of 270 Chapter 8 Principles and Methods of Disease and Pest Control
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HORTICULTURE Principles and Practic
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HORTICULTURE Principles and Practic
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With love to Theresa, quarterback;
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Brief Contents Preface xxi PART 1 T
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Contents Preface xxi PART 1 THE UND
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5.3 PLANT GROWTH PROCESSES 160 5.4
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8.20 COMMON GREENHOUSE DISEASES 276
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12.3 INTERNAL ENVIRONMENTAL CONTROL
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PART 6 Summary 541 References and S
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22.18 INDOOR COMPOSTING SYSTEMS 668
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Preface Horticulture is the area of
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ACKNOWLEDGMENTS I am very grateful
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PART 1 THE UNDERLYING SCIENCE CHAPT
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1 What Is Horticulture? PURPOSE AND
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(a) (c) (b) (d) FIGURE 1-1 The many
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FIGURE 1 Bridge. The plaza view of
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CYCADS Many people mistake these pr
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FIGURE 2 The world's largest unbran
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FIGURE 2 Sold flowers are loaded on
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FIGURE 1-4 Formal landscaping featu
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1.4 ROLEOFTHENURSERY AND SEED INDUS
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1.5 HORTICULTURE AND SOCIETY Hortic
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TABLE 1-3 U.S. Horticultural Export
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Turfgrass Operation 1. Landscape te
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What Is Horticulture? This site pro
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Examples of botanical gardens http:
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2 Classifying and Naming Horticultu
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Eight major taxa are commonly used
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TABLE 2-3 The Divisions of the King
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HISTORY OF PLANT TAXONOMY PAUL R. F
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AGE OF HERBALISTS Two major events
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possible system of nomenclature. Ho
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TABLE 1 Type Categories for Plant N
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2.3 OTHER CLASSIFICATION SYSTEMS (O
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2. Shrubs. A shrub has no main trun
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Simple Fruits Fleshy Fruits Drupe B
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FIGURE 2-14 A pome, represented by
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2.3.5 CLASSIFICATION OF VEGETABLES
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(a) (b) FIGURE 2-22 (Source: George
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FIGURE 2-25 A narrowleaf plant. (So
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FIGURE 2-29 Parts of a typical gras
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such as rosemary, sage, thyme, marj
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c. Leaves d. Bulbs 2. Cut across (t
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Whole plant Organs FIGURE 3-1 Level
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ibonucleic acid (RNA), proteins, an
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called cristae; this extreme foldin
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By virtue of its position, the prim
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Phloem Tissue Structurally, phloem
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(a) Stalk (b) Culm FIGURE 3-5 Cross
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Scale Compressed stem (a) Whole bul
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Upper epidermis Palisade layer FIGU
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usually occur in xerophytes. In cer
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FIGURE 3-22 Selected common leaf ma
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FIGURE 3-25 Selected common leaf ti
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absorption of water and minerals fr
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Outer bark Inner bark FIGURE 3-37 T
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Anther Filament Stamen FIGURE 3-41
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Exocarp Parts of a typi- FIGURE 3-4
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PRACTICAL EXPERIENCE LABORATORY 1.
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4.1 CLIMATE, WEATHER, AND HORTICULT
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concentration in the atmosphere.A c
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TABLE 4-1 Climatic Adaptation of Se
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and upward. Another important gener
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Rate of photosynthesis mg/sq. dm/hr
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and plants that flower under only c
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times of the year. Growers start th
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content. This section is sometimes
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TABLE 4-7 Soil Mineral Nutrients Es
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Micronutrients (Trace Elements) Mic
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Neutral FIGURE 4-11 A representatio
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4.4 FERTILIZERS Fertilizer sources
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One of the most commonly used contr
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Chlorosis (the yellowing of green l
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Fertilizers may be applied before p
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It is neither practical nor safe to
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Solution: How much of ammonium nitr
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1°C (34°F), the optimum temperatu
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Cellulose sponge Perched water tabl
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Overhead Sprinkler Irrigation Water
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FIGURE 4-19 Furrow irrigation of le
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can self-install an underground irr
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1. Surface drainage. Surface draina
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Secondary Tillage Primary tillage i
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(a) (b) (c) (d) FIGURE 4-20 (Source
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texture. The most commonly used gra
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TABLE 4-11 Selected Standard Mixes
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Steam Pasteurization Steam pasteuri
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Maracher, H. 1986. Mineral nutritio
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5 Plant Physiology PURPOSE AND EXPE
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Growth in an organism follows a cer
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5.1.2 THE ROLE OF SIGNALS IN GROWTH
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waxes are embedded. Waxes consist o
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5.3.1 PHOTOSYNTHESIS Photosynthesis
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CO 2 FIGURE 5-6 The C 4 pathway of
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Growth and Development The general
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TABLE 5-2 Energy Produced from Aero
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Certain plants are adapted to dry e
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conditions exist to sustain growth
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Shoot Elongation In certain plants,
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for success, since high temperature
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FIGURE 5-13 Ripening of plantain sh
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Terminal bud removed Unbranched pla
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conditions—pertaining to light, m
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them to maturity. The major process
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6 Breeding Horticultural Plants PUR
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Similarly, there can be no plant br
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APPLICATION, CHALLENGES, AND PROSPE
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hit with target DNA. Therefore, it
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Generally, within ten days of exper
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Aziz A.N., Sauve R.J., Zhou S., 200
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(b) F 1 Rr Rr round round F 2 RR R
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e.g., Aa × Aa), the lethal allele
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eeder’s equation. Simply stated,
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Before the seed or product becomes
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6.18.2 THE GENERAL STEPS OF RDNA TE
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2. Political disagreement. There ar
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REFERENCES AND SUGGESTED READING Ac
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PART 2 PROTECTING HORTICULTURAL PLA
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7 Biological Enemies of Horticultur
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8. Weeds may clog drains, waterways
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is also a root parasite that obtain
Page 244 and 245: LEGISLATIVE Both state and federal
Page 246 and 247: Example Integrated cultural, physic
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Page 254 and 255: FIGURE 7-12 Corn earworm damage. (S
Page 256 and 257: TABLE 7-1 Selected Fungal Diseases
Page 258 and 259: 7.6.1 SMALL ANIMALS Rabbits, mice,
Page 260 and 261: FIGURE 7-16 The disease triangle. P
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Page 264 and 265: SUMMARY Insects are a major class o
Page 266 and 267: For the home growers or those who c
Page 268 and 269: for consumers and the environment).
Page 270 and 271: TABLE 8-1 Strategy 4: Strategies an
Page 272 and 273: gibberellic acid spray overcomes st
Page 274 and 275: In a competitive industry, a variet
Page 276 and 277: Chemicals gain access to humans thr
Page 278 and 279: 2. Pesticide management. Controllin
Page 280 and 281: Every organism has its natural enem
Page 282 and 283: TABLE 8-3 Selected Examples of Biol
Page 284 and 285: 1 2 YEAR 3 4 FIGURE 8-5 cycle. A cr
Page 286 and 287: 6. Heat treatment. In the greenhous
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Page 290 and 291: under enclosed conditions (e.g., wa
Page 292 and 293: FIGURE 8-9 A tractor-mounted spraye
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Page 302 and 303: Sulfur may be applied for both prev
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Page 306 and 307: PART 3 PROPAGATING HORTICULTURAL PL
Page 308 and 309: 9 Sexual Propagation PURPOSE AND EX
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Page 312 and 313: Lettuce seeds Red light Darkness Fa
Page 314 and 315: FEDERAL AND STATE SEED LAWS Federal
Page 316 and 317: Germination Test In laboratory prac
Page 318 and 319: FIGURE 15 The essential structures
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Page 332 and 333: (a) (b) FIGURE 9-12 (a) Sowing seed
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This practice is especially importa
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10.6.4 STICKING THE CUTTING Cutting
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(a) Indexing by budding Diseased pl
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10.11 M ETHODS OF GRAFTING Grafting
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Scion Wax FIGURE 10-17 Steps in bar
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MODULE 3 BUDDING 10.12 TYPES OF BUD
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MODULE 4 LAYERING 10.13 TYPES OF LA
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Buried part of shoot is nicked FIGU
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variety of ways. In air layering, a
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FIGURE 10-34 by using cormels. Prop
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Psuedobulbs In the Dendrobium orchi
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The technique is used widely in cro
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PART 4 GROWING PLANTS INDOORS CHAPT
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11 Growing Houseplants PURPOSE AND
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TABLE 11-1 Common houseplants Commo
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Saddle leaf Philodendron selloum To
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Window Displays Plants in windows e
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CONTAINER GARDENS DR. TERRI W. STAR
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annuals and hardy perennial species
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of the large container filled with
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perfection about four to six weeks
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FIGURE 11-6 Flowers displayed on th
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TABLE 11-5 Plant Selected Plants fo
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The lighting condition near these w
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Fluorescent Lights Fluorescent ligh
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may be used for one pot or a group
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garden rooms, atriums, or a large c
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The photoperiod affects when the ho
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patted firm to keep the plant erect
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Other Materials Apart from clay and
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(a) ( FIGURE 11-25 Support for plan
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TABLE 11-7 Common Problems of House
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• Keep soil moist all the time
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• Prefers high temperatures • P
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amount and quality of light. If sup
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12 Controlled-Environment Horticult
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6. Curvilinear 7. Curved eave 8. Do
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Detached greenhouses have several a
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12.2.3 FRAME DESIGN There are two b
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horticultural business a less-expen
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Texas, Hawaii, and California. The
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source of heat for times when the t
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FIGURE 12-17 Greenhouse production
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FIGURE 12-21 Moving tables allowing
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Research program on greenhouse engi
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greenhouses equipped with a variety
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FIGURE 1 Annual energy required per
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This system was demonstrated in a 5
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FIGURE 6 Amounts of waste energy ut
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Ekholt, B.A., D.R. Mears, M.S. Gini
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or object to be warmed. Failure to
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objects in its path (e.g., the floo
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FIGURE 12-27 Motorized ventilation
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FIGURE 12-30 Movable internal shade
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FIGURE 12-33 A high pressure sodium
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Source of Water The quality of loca
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FIGURE 12-37 Overhead sprinkler irr
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Intermittent Feed Greenhouse plants
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However, in winter, greenhouse vent
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OUTCOMES ASSESSMENT 1. Explain the
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. Foliage or green plants. Foliage
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2. Labor. The size of the labor for
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FIGURE 13-1 Greenhouse production o
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FIGURE 13-2 Lettuce plug is inserte
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13.8.4 AGGREGATE HYDROPONIC SYSTEMS
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(a) (b) (c) FIGURE 13-6 Plug produc
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14 Growing Succulents PURPOSE AND E
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FIGURE 14-3 Leaf succulent represen
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frost-hardy. Their rosettes are usu
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TABLE 14-1 Plant Selected Popular S
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(a) (b) FIGURE 14-12 Typical bromel
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14.7.1 WHAT ARE CACTI? 14.7 CACTI C
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FIGURE 14-16 Opuntia. (Source: Crai
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FIGURE 14-23 Mammillaria. (Source:
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FIGURE 14-28 Both desert and jungle
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Growing mix Gravel Cacti (a) (b) FI
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PART5 GROWING PLANTS OUTDOORS: ORNA
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15 Principles of Landscaping PURPOS
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8. Create recreational grounds. Suc
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knowledge, with concern for resourc
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(a) (b) (c) FIGURE 15-2 The occurre
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GUIDELINES FOR LANDSCAPE DESIGN DAV
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the landscape. Some very successful
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Rhythm and Line Panoramic view of a
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FIGURE 15-10 A formal garden. The e
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How frequently do they entertain? A
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the patio should be located on the
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15.7.1 SELECTING PLANTS A homeowner
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Plant Arrangement in the Landscape
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Shadow FIGURE 15-15 Planting a tree
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SUMMARY Landscaping enhances the su
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3. Supply materials on a timely bas
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such as preparation rooms (for mixi
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of environmental fluctuations. Furt
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FIGURE 16-4 A bare-root tree seedli
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17 Installation of the Landscape PU
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for walks, driveways, and patios (F
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Planting may be limited to accentin
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17.3.3 PREPARING THE BED The soil s
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FIGURE 17-4 Bedding plants raised i
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SUMMARY Bedding plants are largely
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TABLE 17-6 Selected Ground Covers T
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TABLE 17-7 Selected Ornamental Gras
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they determine the success and surv
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12. Wildlife attraction. Trees in t
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pennsylvanica), hackberry (Celtis s
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y winds. A stake, which is often a
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TABLE 17-8 Selected Narrowleaf Ever
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TABLE 17-11 Selected Deciduous Shru
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Blooming bushes 1. Blue mist shrub
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Planting Bulblets and Bulbils Speci
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may be divided such that each secti
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FIGURE 18-1 (Source: George Acquaah
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Cool-Season (Temperate) Grasses In
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Growth Habit Turfgrasses are the mo
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Heavy Use Lawns on playgrounds and
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The seed should be free from weeds
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Source of Sod As with seed, sod sup
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A plug of sod FIGURE 18-7 Plugging
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way, plants are able to adapt to th
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form of a can placed on the lawn wi
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TABLE 18-3 Some Common Lawn and Tur
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even surface soil surface for layin
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MacCaskey, M. 1987. All about lawns
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Pruning is sometimes done in conjun
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4. Pruning may be done to reduce th
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19.4.2 SAWS A saw may be designed t
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defeat the purpose of pruning. The
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Bud withers as cut end dries back d
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19.6 STRATEGIES FOR PRUNING ABOVEGR
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Rejuvenation Pruning Cut canes to a
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3. In the third and subsequent year
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(a) Cut Prune (b) FIGURE 19-16 Step
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Eucalyptus and Paulownia are amenab
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TRAINING & PRUNING DECIDUOUS FRUIT
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Summer pruning eliminates an energy
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a) b) FIGURE 2 Newly planted apple
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FIGURE 6 Wooden limb spreaders can
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FIGURE 9. An apple tree trained to
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years to promote continued lateral
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Horizontal Espalier The horizontal
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19.16.1 CANE FRUITS Cane fruits are
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FIGURE 19-26 Shearing of Christmas
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pyramid-like form that is wider at
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After selecting the appropriate spe
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PART 6 GROWING PLANTS OUTDOORS: VEG
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20 Growing Vegetables Outdoors PURP
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The National Agricultural Statistic
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(This item omitted from WebBook edi
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growers should take to determine an
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pests and reduce/ eliminate hail da
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square yard (10 to 68 grams per squ
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High tunnels help increase the prof
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(This item omitted from WebBook edi
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20.4 VEGETABLE MARKET TYPES Fresh V
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Establishing the Crop Planting into
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home water supply from the tap. Thi
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Cole crop Cabbage Root Potato Bean
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6. Adequate nutrition. While overfe
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variable, ranging from creamy yello
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There are two general production pr
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This toxin is heat resistant and no
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large, or jumbo. The bulb may be sw
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REFERENCES Growing selected vegetab
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TABLE 21-1 Popular Herbs and Their
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(a) (b) (c) (d) (e) (f) FIGURE 21-1
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22 Organic Farming PURPOSE AND EXPE
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22.3 PRINCIPLES OF ORGANIC FARMING
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and the specific materials to be us
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22.8 MANAGING SOIL PHYSICAL QUALITY
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preemergent or early postemergent o
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Composting is a deliberate activity
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22.14.5 THE CARBON-TO-NITROGEN RATI
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Moisture Supply Water is required b
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Compost materials FIGURE 22-4 a wir
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As microbial decomposition proceeds
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Establishment and Management of an
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night, freezing can occur in spring
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accomplished by stratification. It
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transmitted by the dagger nematode
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PART 7 SPECIAL TECHNIQUES AND HANDL
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24 Cut Flowers and Floral Design PU
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to more than four-fold in standard
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Temperature and Humidity Wilting re
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FLORAL DESIGN: AN OVERVIEW BY WM. J
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Principle Definition Types (or Uses
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pH value-a measure of the acidity o
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FIGURE 6 Parallel Design-Parallel d
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24.3.2 TOOLS AND MATERIALS The tool
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3. Establish the focal point. 4. Ad
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Natural Drying To dry naturally, fl
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24.4.3 DRIED FLOWER ARRANGEMENTS Dr
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25 Terrarium Culture PURPOSE AND EX
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FIGURE 25-3 Terrarium containers ar
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FIGURE 25-5 Assortment of tools use
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25.6.7 ENHANCING THE DISPLAY Certai
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(a) (b) FIGURE 26-1 Bonsai can be c
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TABLE 26-3 Plant A Selection of Pop
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26.3.1 COLLECTING BONSAI PLANTS FRO
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Strip bark Bare branch FIGURE 26-9
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26.5.2 SANITATION It is critical to
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27 Postharvest Handling and Marketi
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whereas oranges are picked (they ha
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(b) (a) (c) (d) (e1) (e2) (f) FIGUR
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To reduce packaging injury, contain
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is replaced by the by-product of re
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Stored produce may lose some color,
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with pricing. When selling by volum
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(a) (b) FIGURE 27-5 Horticultural p
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APPENDIX A Temperature: Converting
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APPENDIX B Metric Conversion Chart
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APPENDIX D Common and Scientific Na
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Pecan (Carya illinoensis) Peony (Pa
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GLOSSARY A Abaxial Turned away from
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Cellulose A complex carbohydrate th
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Floriculture The science and practi
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M Macronutrient An essential elemen
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Root cap A mass of hard cells cover
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INDEX A-frame, 395 A-horizon, 108 A
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defined, 390 fertilization, 432-434
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Radiant heaters, 378 Radicle, 90 Re
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color plate 1 (a) (b) (c) (d) (e) M
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color plate 3 (b) (a) (c) (d) (e) (
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color plate 5 (a) (b) (d) (c) (e) (
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color plate 7 (b) (c) (d) (a) (e) (
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color plate 9 (a) (b) (c) (d) (e) (
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color plate 11 (a) (c) (b) (d) Grow
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color plate 13 (a) (b) (c) (d) (e)
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color plate 21 (a) (b) (c) (e) (d)
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color plate 23 (c) (b) (a) (d) (e)
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color plate 25 (c) (a) (b) (d) (e)
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color plate 27 (a1) (a2) (b2) (b1)
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color plate 31 (a) (b) (c) Floral d
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Horticulture Principles and Practices

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