Annals of Plant Protection Sciences
Year : 2002, Volume : 10, Issue : 2
First page : ( 184) Last page : ( 187)
Print ISSN : 0971-3573.

Field Evaluation of Native Nucleopolyhedrovirus for the Management of Sunflower Head borer, Helicoverpa armigera (Hiibner)

Arora Ramesh, Padmanaban N.

Department of Entomology, Punjab Agricultural Univesity, Ludhiana 141 004, India.

Abstract

The efficacy of two weekly sprays of a native isolate (PAUI) of HaNPV against the sunflower head borer, Helicoverpa armigera was assessed at two dosages viz., 250 LE/ha and 375 LE/ha in a replicated field trial. The lower dosage was ineffective in reducing the larval population and % head damage by the pest. The higher dosage of HaNPV with a larval population of 1.0 larva/l0 plants was at par with the standard insecticide (carbaryl 1.0 kg a.i./ha) treatment with 1.l6 larva/10 plants. The highest yield of 13.5 q/ha was recorded with the higher dosage of HaNPV which was, however, at par with carbaryl (12.4 q/ha). On the otherhand, lower dosage of HaNPV with a yield of 8.8 q/ha was at par with control (6.3 q/ha).

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Key words

Helicoverpa armigera, Nucleopolyhedrovirus, Sunflower.

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