Rainfed rice - IRRI books - International Rice Research Institute

Insect Pest Management
P
ests are one of the major constraints to growing a healthy rice crop in
rainfed areas in eastern India. With the evolution of modern
varieties, pests in the fields are increasing. Losses in grain yield from
insect pests vary from 5% to 15%, depending on the location and moisture
regime. The appearance of pests and the resulting damage and loss depend
on components such as variety, environment (macro- and micro-climate),
soil type, temperature, moisture and agronomic and water management
practices.
Managing major pests
All pests do not occur at the same time
in the same ago-climatic condition.
These methods may be adopted where
these pests appear year after year.
Control measures for insect pests
Yellow stem borer
Summer ploughing and destroying
stubble.
Apply granular insecticides such as:
• Lindane 6G at 20 kg/ha;
• Carbofuran 3G in soil in nurseries
at 2.5 g/sq m or 25 kg/ha;
• Phorate 10G at l0kg/ha:
•
Phosphamidon 85EC at 300 ml/
ha;
• Dimethoate 30EC at 1.0l/ha;
• Monocrotophos 36EC at 1.0l/ha;
• Quinolphos 25EC at 1.0-1.25l/ha;
or
• Fenitrothion 50EC at 1.0l/ha at
economic threshold level (ETL) of
5% deadheart; or one egg mass/
one adult/sq m crop area.
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Integrated rice-pest management
This is managing insects, weeds and
rodents at populations below the
economic injury level by using a
combination of two or more control
methods such as biological and
chemical control.
Yellow stem borer