Leaf folder
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Rice, sorghum, maize, and wheat are the main host plants.
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Also occur in wild hosts (wild rice, banana, coconut, oak, barley, tobacco, sugarcane, millet)
Scientific Name - Cnaphalocrocis medinalis
Occurrence Stage - Vegetative Stage
Nature of Damage - Caterpillar folds the leaf and attach the leaf margins together and feed inside the leaf fold.
Damage Symptoms - Vertical leaf folds, transparant and whitish streaks on the leaf blade
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Source: Ento 31 |
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Source: ICAR- CRIDA |
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Figure 23 Life Cycle of Rice Leaf Folder |
Figure 24 Larva Folding the leaf margins |
Figure 25 Rice field damaged by Rice Leaf Folder |
Best Control Measures
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In China, egg parasotiod wasps (Trichogramma japonicum and Apanteles cypris) are used
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Granulosis virus can destroy 30-40 % of caterpillars
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IET 8675/ 8698/ 8710/ 7776 varieties are moderately resistant to leaf folder
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Narrow-leaf blade varieties are more resistant than wide-leaf varieties
Chemical Control
Use the following organophosphate and organothiophosphate insecticides at recommended rate.
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Neem oil
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Diazinon EC 1.0 Kg/ ha
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Dichlorvos EC- 0.3-0.5 Kg/ha
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Dichrotophos EC 0.38 Kg/ha
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Fenitrothion EC 0.6 Lit/ha
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Fenthion EC 0.6 Lt/ha
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Mephosfolan EC 0.5-1.0 Kg/ha
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Phosmet WP
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Phosphamidon EC 0.2-0.3 Kg/ha