Rose Guide - Otto and Sons Nursery

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Disease & Pest Control Control Overview The amount of spraying you do will depend on your tolerance of diseases and pests. Prevention is the key to a disease free plant. If you have any questions regarding spray material, check with your local California Certified Nursery Professional or Cooperative Extension Service for your spray program. Please do not hesitate to contact us for suggestions or insights we may have to offer. We have listed some suggestions below. When spraying, please make sure that you spray the roses in the cool early morning so the foliage won’t be wet overnight. It is important that the plant’s soil is well watered and the leaves are dry prior to any application. Some of the “softer” sprays that will control many diseases are Ultra Fine, Rose Defense, and Safer Garden Fungicide. Water can be used effectively to control many diseases. By washing the rose plant with water in the early morning, insects and fungal spores will be dislodged from the plant and may reduce their occurrence. Dormant Spray When your winter pruning is finished, usually in January, a good Dormant Spray should be applied. Volk Oil and Kop-R applied thoroughly will reduce insect eggs and fungal spores that over-winter on your plants. Beneficial insects and mites can also be released to control pests, but you must be willing to put up with some pest damage on your roses. Rose Diseases Powdery Mildew Powdery mildew is first visible as a white powderlike substance on the leaf surfaces or flower buds. New plant growth is the most susceptible to infection. Infection is most likely when humidity is high (but no moisture) and temperatures are cool. Look for it during warm days and cool nights. Recommended products for prevention control are Green Light Fung-Away or Immunox applied as per the label instructions. Rust Rust symptoms generally appear first as orange powdery spots on the under surface of the leaves. Rust can cause leaf drop and reduce growth. Recommended products for prevention control are Immunox, Funginex, or Green Light Fungicide per label instructions. Blackspot Blackspot symptoms are well described by the name. They appear on the upper side of the leaves surrounded by yellow tissue. Chlorosis may extend throughout the leaf before leaf drop occurs. This fungus disease occurs during cool and wet periods. Recommended products for prevention control are Bravado, Funginex, Immunox, and Green light Systemic fungicide. Spray coverage on the underside of the leaf is important for control. Botrytis Blight aka; Grey mold, “Balling”, brown spots on petals and brown cane die-back. The disease occurs during high humidity and cool rainy nights. Recommended product is Bravado. Downy Mildew This can be the most devastating disease for roses. This disease rarely causes mortality, but it can cause severe leaf drop. This can necessitate the restarting of the rose crop with cutting back and re-growing.This delay will mean an additional 6 weeks from cutback for flower production. Symptoms of downy mildew occur on leaves with the development of purplish red to dark brown spots. The leaves may turn yellow and drop. Leaf symptoms may resemble black spots or burns from pesticide toxicity. Under humid conditions lesions appear in large numbers on the surfaces of the leaves. Fungicide application must provide coverage on the bottom of leaves for good control. Spore reproduction and infection slows when the humidity drops below 85%. In ideal conditions, spores can multiply in as little as 3 hours. The ideal condition exists for infection when temperatures are 55-65 degrees with humidity over 85%. Control is achieved by lowering the humidity, raising the temperature and preventative application of fungicide. Since neither the temperature nor humidity can be controlled in an outdoor environment, a regular fungicide application is necessary. A regular application of Agri-Fos per labeled instructions is recommended. A program that alternates material such as Subdue, Agri-Fos and Stature has been effective.
Rose Pests Rose continued…... Pests Spider Mites Thrips – Blooms Leaves appear are shredded, mottled silver distorted on surface with and underside discolored. Light brown having insects, small red very specks, slender webbing and or very long. small They spider-like can be insects moving about. Older leaves will show symptoms first. found easily Hot dry in a weather flower is the bud prime when time for peeled these pests. apart. Control is achieved by using Orthenex. Water is very effective to Using Monterey dislodge Garden the pest from Insect the underside Spray of will the bring leaf. good results. Rose Slug Aphids – Small slug-like insect that eats holes in leaves and stems. A coastal problem. The adult insect is a wasp Green, red, or black bugs about 1/8” long found mostly on relative and new is soft called growth a and Sawfly. flower buds. They can appear in early spring and stay through fall. Very easy to control, but they Spray the keep plant coming with back. Monterey In spring, use Garden Rose Systemic Insect and Spray then to control the “Worms”. change to Orthenex, or Malathion in June. Water sprays are very effective. Cutter Bees – These insects remove a portion of the flower Thrips bud or tender leaf and take it to their nest. Blooms are shredded, distorted and discolored. Light brown These insects insects, are very sporadic slender and and long. difficult They can be to found control. easily in Some people recommend a flower bud when Sevin, peeled but apart. I just Using leave Monterey them Garden alone. Insect Spray will bring good results. Caterpillars Rose – Slug Look for legs on a worm and you have found a caterpillar or looper. Usually found eating the flower petals. Small slug-like insect that eats holes in leaves and stems. A coastal problem. The adult insect is a wasp relative and is Caterpillar called Killer a Sawfly. contains Spray “BT” the plant which with Monterey is a bacterium Garden Insect that is Spray to control the “Worms”. eaten by the looper. The “BT” then consumes the looper from the inside Cutter Bees out which takes a couple of days to kill the looper. These insects remove a portion of the flower bud or tender leaf and take it to their nest. These insects are sporadic and Always difficult to read control. Some the people pesticide recommend Sevin, but label I just leave them alone. and follow those directions! Caterpillars Look for legs on a worm and you have found a caterpillar or looper. Usually found eating the flower petals. Caterpillar Killer contains “BT” which is a bacterium that is eaten by the looper. The “BT” then consumes the looper from the inside out which takes a couple of days to kill the looper. Agri-Fos Bayer Disease Bravado Fung-onil Immunox Disease Kop-R-Spray Rose Pride Bayer 3 way systemic Immunox Plus Disease & Insect Orthenex Rose Defense Caterpillar Killer/BT Malathion Monterey Garden Insect Spray Bayer 2-n-1 Systemic Rust Powdery Mildew Black Spot Botrytis Disease Controls: Combo Control: Insect Control: Downey Mildew Aphids Caterpillars Always read the pesticide label and follow those directions! Thrip Mites Rose Slug
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Rose Guide - Otto and Sons Nursery

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