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Identification H.
armigera is a large brown moth which is active at night. It lays eggs
usually singly, mostly on the undersides of leaflets. Young
larvae feed by scrapping the surface of leaflets and the older larvae chew
into leaflets, buds, flowers and pods. Fully grown larva green and measures
approximately 25 mm in length. Adults moths are medium-sized with a wing span of 25 mm. Forewings are brownish and hindwings are translucent.
Management
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Plough
deeply, clean cultivation to expose the resting pupae, crop rotation and
avoidance of
ratooning reduce pest population.
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Use tolerant/resistant varieties
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In
case of pigeonpea grow coriander/linseed as trap crop.
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Fix 3 feet sticks in the field @ 10/ha
as bird perches to attract predatory birds.
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Fix
Helicoverpa pheromone traps @ 2-5/ha.
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Broadcast leftover cooked rice in the field to attract birds.
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Physical
shaking of plants to dislodge the larvae in case of pigeonpea helps in
reduction of the population load.
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Spray
of NSKE (Neem Seed Kernal Extract) 5% if population exceeds above
ETL level.
Need
based spray of insecticides effective
against the pest including endosulfan and other fast degrading pesticides.
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