Fruit Borer: Helicoverpa armigera
Symptoms of damage:
- Young larvae feed on tender foliage
- Mature larvae bore circular holes
- Thrust only a part of its body into fruit and eat the inner content.
Identification of pest:
- Eggs: Eggs are sculptured and creamy white in colour, laid 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 band
- Pupa: Brown in colour, occurs in soil, leaf, pod and crop debris
- Adult: Female light pale brownish yellow stout moth, Male – Pale greenish moth V shaped speck.
- Forewing: olive green to pale brown with a dark brown circular spot in the centre
- Hindwing: is pale smoky white with a broad blackish outer margin
Management:
- Collect and destroy the infected fruits and grown up larvae
- Grow simultaneously 40 days old American tall marigold and 25 days old tomato seedling at 1:16 rows
- Setup pheromone trap with Helilure at 12/ha
- Collection and destruction of damaged fruits and grown up caterpillars.
- Release Trichogramma pretiosum @ 1 lakh nos. /ha/release at an interval of 7 days starting from flower initiation stage based on ETL of 10% damage.
- For Helicoverpa armigera: HaNPV 1.5 x 1012 POBs/ha i.e. NPV of H. armigera 0.43% AS @ 3.0 ml/lit or 2 % AS @ 1.0 ml per lit
- For Spodoptera litura: Sl NPV 1.5 x 1012 POBs/ha
- Provide poison bait with carbaryl 50 WP 1.25 kg, rice bran 12.5 kg, jaggery 1.25 kg and water 7.5 lit/ha
- Spray Bacillus thuringiensis 2g/lit or any one of the following insecticide
Source-
- TamilNadu Agritech Portal
