Gram pod borer: Helicoverpa armigera
Symptoms of damage:
- Larvae feed on the foliage, prefers flowers and buds
- When tender leaf buds are eaten symmetrical holes or cuttings can be seen upon unfolding of leaflets
Identification of the pest:
- Eggs: Spherical in shape and creamy white in colour, present singly
- Larva: Shows colour variation from greenish to brown. It has dark brown-grey lines on the body with lateral white lines and also has dark and pale bands.
- Pupa: Brown in colour, occurs in soil, leaf, pod and crop debris
- Adult: Light pale brownish yellow stout moth. Forewings are olive green to pale brown with a dark brown circular spot in the centre. Hind wings are pale smoky white with a broad blackish outer margin.
- Deep summer ploughing
- Intercrop one rows of red gram for every 5 or 6 rows
- Install pheromone trap @ 5/ha
- Use Trichogramma chilonis @ 1 lakh/ha or Chrysoperla carnea @ 50000/ha at 40 and 50 days after sowing of groundnut can effectively check the pest
- Apply HaNPV @ 250 LE/ha or B.t (Bacillus thuringiensis) 1 kg/ha or 5% NSKE for monitoring eggs and early instar larvae
- Conserve the biocontrol population of spiders, long horned grasshoppers, preying mantids, robber fly, ants, green lacewing, damselflies/dragonflies, flower bugs, shield bugs, lady bird beetles, ground beetle, predatory cricket, braconids, trichogrammatids, NPV, green muscardine fungus
- Spray any one of the following insecticide
- quinolphos 2ml/lit of water
- chloropyriphos 3ml/lit of water
- Imidacloprid 2ml/lit of water.
- TamilNadu Agritech Portal.