Field evaluation of native nucleopolyhedrovirus for the Management of Sunflower head borer, Helicoverpa armigera (Hubner)
2002
Arora, R. | Padmanaban, N. (Punjab Agricultural Universit, Ludhiana (India). Department of Entomology)
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 replicate 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/10 plants was at par with the standard insecticide (carbaryl 1.0 kg a.i/ha) treatment with 1.16 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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