About Lesson
Spotted bollworm (Earis villa , E.insulana, Noctuidae, Lepidoptera)
Damaging stage: larvae
Symptoms of damaging: damaging tender hoot by boring later instar bores flowers, squares, and bolls.
Identification
a) Earis vitella
- Egg : white
- Larvae: light brown with white patches and ventral aspect green in color and body covered with bristle/setae.
- Pupa: pupation on leaf, fruit and
- Adult: pale white forewings, a broad green band in the middle.
b) Earis insulana
- Egg : white
- Larvae: dull greenish-white in color with no black marking and orange color dot on the prothoracic region.
- Pupa: pupation on sand, leaf, and fruit.
- Adult: The forewings are completely green in color The wings are white.
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E. vitella |
E. insulana. |
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Larva |
Brown, with longitudinal white stripes on the dorsal side as against for |
Cream-coloured body with orange dots on prothorax |
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Adult |
Medium-sized, head and thorax ochreous white |
Adults are smaller than E. villa Head and thorax pea green in color |
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Forewings are pale white with a |
Forewings uniformly pale yell |
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the |
broad wedge-shaped horizontal green patch in the middle. |
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Management
- Crop rotation and clean
- Deep summer
- Intercrop sorghum, green gram, cluster
- Pheromone
- Trichogramma
- Bt cotton
- Release of 1st instar larvae of green lacewing predator Chrysoperla carnea @ 10,000/ha.
- Dust carbaryl 10 % DP @ 25 kg /ha or spray Bacillus thuringiensis @ 2 g/lit.Or spray any one of the following insecticides.
