American bollworm

Ehtisham Ali Hussain
University College Of Agriculture,
University Of Sargodha, Sargodha
For more Topics Contact..,
[email protected]

1. Insect Pests of Agricultural Crops Insect Pests of Cotton In the name of Allah, the most Merciful and the most Beneficent

2. Ehtisham Hussain BAGF15E258 University College Of Agriculture, University Of Sargodha, Sargodha

3. American Bollworm Technical Name: Helicoverpa armigera (Noctuidae; Lepidoptera) Major pest of Cotton

4. Identification: Moth- yellowish brown in colour with a black kidney shape mark on the underside of the forewings larvae- greenish with dark brown grey lines

5. Larva Adult Egg

6. Life Cycle of American Bollworm: Larva Adult Egg Pupae After hatching young larvae feed in foliage egg hatches in one week Lays eggs singly on tender plants There are 8 generations of this pest in a year Bores into bolls and feed on them, with its body hanging outside Larvae full fed, they come out of the boll and pupate in the soil Pupa is dark brown with sharp spine at the posterior end

7. Damage: Caterpillar are polyhagous Feed on foliage and on the bolls of cotton Reduce yield Show prominent hole Dirty faeces accumulate on the boll surface Damage in patches

8. Control: Avoid the cultivation of okra, arhar, moong, castor and dhaincha in and around the cotton crop Avoid growing of American cotton in the field Ichneumonid wasp, larval parasitoid of American bollworm should be promoted in the field Spray profenofos EC 800 ml/acre

9. Other host: Chickpea Vegetables Distribution: Pakistan as well as many countries of South Asia