Symptoms of damage:
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Adults feed on chlorophyll by scraping and causing white parallel streaks.
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Grubs tunnel through leaf tissues and make blisters near leaf tips.
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Whitish and membranous leaves. .
Identification of insect pest:
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Egg: Eggs are laid inside minute slits on the tender leaves generally toward the tip
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Crub: The grub is whitish yellow and flattened. It feeds inside the leaf tissue by mining. It pupates inside
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Adult: The adult beetle is somewhat square shaped about 1/6 to 1/8” in length and width. Dark blue or blackish in colour with spines all over the body.
Management:
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ETL: 2 adults /hill
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Avoid over-fertilizing the rice field. In situations of high hispa incidence, top-dressing of nitrogen fertilizer may be skipped.
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Sustained collection of adults by sweep net and destruction.
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Spray/broadcast/dust any one of the following insecticides per acre based on ETL: carbofuran 3% CG 10 kg; emamectin benzoate 1.9 EC 170 ml; malathion 5 DP 10 kg; malathion 50 EC 460 ml.
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| Leaf with parallel white streaks |
Leaf with blister |
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| Grub |
Adult |
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