A handbbok on Weed Control in Rice.pdf

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Lowland rice weeds / POACEAE (grass family) Weed name: Echinochloa glabrescens Munro ex Hook.f. Synonyms: None Local names: Country Common name Japan inubie Philippines bayakibok, daua-daua (Tagalog) Life cycle: An annual grass that grows 0.5-1.0 m tall. Propagates by seeds. Habitat: Adapted to wet soils. Distribution extends from the Indian subcontinent through mainland Southeast Asia and China to Korea, southern Japan, and the Philippines (Michael 1983). Weedy nature: Ecologically similar to rice. Agricultural concern: Very competitive with rice. When E. glabrescens seedlings were transplanted with rice, yield losses ranged from 7% when 5% of the rice hills were infested to 87% when 50% of the rice hills were infested (IRRI 1987). 18 Weed control handbook Seedling Seed, magnified Mature plant Inflorescence
Lowland rice weeds/POACEAE (grass family) Weed name: Ischaemurn rugosum Salisb. Synonyms: None Local names: Country Common name Bangladesh moran (Bengali) Brazil capin macho (Portuguese) Colombia trigillo (Spanish) Dominican Republic yerba de papo (Spanish) Fiji comuraina India mararo (Bengali) Indonesia blemben (Javanese) Malaysia rumput ekor jawi (Malay) Myanmar ka-gyi-the-myet Peru mozorquilla (Spanish) Philippines tinitrigo (Tagalog) Sri Lanka kudukedu (Sinhalese) Thailand yah daeng USA saramollagrass Life cycle: An annual grass that grows to 120 cm tall. Propagates by seeds, which may remain dormant. Habitat: Prefers wet soils and swampy areas. Weedy nature: A vigorous, aggressive weed. Seeds shatter easily, so that there is a constant source of infestation. During vegetative growth, resembles the rice plant, making it difficult to recognize as a weed. I. rugosum, however, has deep reddish-brown to purple leaf sheaths, a color only weakly developed in rice. Agricultural concern: Very competitive: 5 plants/m 2 reduced rice yields 15% and 80 plants/m 2 reduced yields 82% in IRRl trials (IRRI 1987). Mature plant Inflorescence Seed, magnified Weeds worldwide 19
Page 1 and 2: 1991 P.O. Box 933, 1099 Manila, Phi
Page 3 and 4: Foreword Farmers everywhere search
Page 5 and 6: Contents FOREWORD PREFACE 1 S IGNIF
Page 7 and 8: Table 1.3. Weeds as secondary hosts
Page 9 and 10: horizontal leaves. Tall plants have
Page 11 and 12: Chapter 2 Rice weeds of worldwide i
Page 13 and 14: Lowland rice weeds ASTERACEAE (Comp
Page 15 and 16: Lowland rice weeds / CYPERACEAE (se
Page 17 and 18: Lowland rice weeds / CYPERACEAE (se
Page 19 and 20: Lowland rice weeds / ONAGRACEAE (ev
Page 21: Mature plant Inflorescence Seed, ma
Page 25 and 26: Lowland rice weeds / POACEAE (grass
Page 27 and 28: Lowland rice weeds / PONTEDERIACEAE
Page 29 and 30: Upland rice weeds AIZOACEAE (carpet
Page 31 and 32: Upland rice weeds / ASTERACEAE (sun
Page 33 and 34: Upland rice weeds / CYPERACEAE (sed
Page 35 and 36: Upland rice weeds / POACEAE (grass
Page 41 and 42: Upland rice weeds / PORTULACACEAE (
Page 43 and 44: Deepwater weeds / CONVOLVULACEAE (m
Page 45 and 46: Wetland tillage is common in most t
Page 47 and 48: leaf size), with the resultant shad
Page 49 and 50: Economics of control The economic b
Page 51 and 52: Chapter 4 Principles of herbicide u
Page 53 and 54: Preemergence herbicide application
Page 55 and 56: and behavior in the crop environmen
Page 57 and 58: Table 4.1. Meanings of signal words
Page 59 and 60: 4.3 Controlled-droplet applicators
Page 61 and 62: amount after spraying is 8 liters,
Page 63 and 64: The decision to spray should be mad
Page 65 and 66: farmers, however, should wear cloth
Page 67 and 68: Table 5.1. Susceptibilitles a of im
Page 69 and 70: Propanil can be used at 3-4 kg ai/h
Page 71 and 72: Thiocarbamates Thiocarbamates are a
Page 73 and 74:
Quinclorac. Quinclorac is a chino-
Page 75 and 76:
Planting method Transplanting into
Page 77 and 78:
Direct seeded on puddled soil In di
Page 79 and 80:
Table 6.2. Herbicides suitable for
Page 81 and 82:
6.4 Rice growth stages when herbici
Page 83 and 84:
Fertilizer Incorporating N and P fe
Page 85 and 86:
Nurseries Seedling nurseries should
Page 87 and 88:
Land preparation Leveling the puddl
Page 89 and 90:
Land preparation Land preparation s
Page 91 and 92:
Chapter 8 Weed control in upland ri
Page 93 and 94:
Hand weeding The weed-free period r
Page 95 and 96:
Chapter 9 Weed control in deepwater
Page 97 and 98:
Hand weeding Hand weeding is the mo
Page 99 and 100:
Chapter 10 Management of some diffi
Page 101 and 102:
Wild rices The important wild rices
Page 103 and 104:
Herbicides For effective control of
Page 105 and 106:
IRRI-International Rice Research In
Page 107 and 108:
B. Conversion table for granular fo
Page 109 and 110:
Index A Absorption of herbicide, 50
Page 111 and 112:
in deepwater and floating rice, 96
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A handbbok on Weed Control in Rice.pdf

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