Integrated Pest Management of Pod borer, Helicoverpa armigera (Hubner) on Pigeonpea (Cajanus cajan (L.) Millsp) Using NPV and NPV-insecticides Sequential Sprays
R.S. Giraddi, K.S. Panchabavi, L. Krishna Naik, Y.K. Kotikal, S. Lingappa
Abstract
Field trials were conducted at three locations during kharif 1989 to know the effect of nuclear polyhedrosis virus (NPV) and NPV-insecticide sequential sprays on the pod borer complex of pigeonpea crop. Lowest pod damage and highest seed yield were encountered in the treatments receiving three rounds of sequential spray of NPV-pyrethroids-NPV, while NPV or insecticide alone failed to give an appreciable control. Among the sequential sprays of NPV and insecticides, NPV-Fenvalerate-NPV sequence was significantly effective with lower pod damage (from 6.7 to 43,0%) and highest seed yield (from 18.5 to 22.9 q/ ha). The cost: benefit ratios in the spray sequence treatments involving NPV and pyrethroids were moderate and encouraging
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