N. Venugopal Rao ¹, A. S. Reddy ², D. D. R. Reddy ³

Affiliations
1 Regional Agricultural Research Station, Lam, Guntur 522 034, IN
2 Regional Agriculture Research Station, IN
3 Department of Entomology, College of Agriculture, IN

Abstract

The glabrous varieties of cotton favoured higher parasite activity on whitefly, recording more than 40 percent parasitisation, while hairy varieties recorded higher number of predatory mites. The integrated management programme involving natural insecticides of plant and animal origin was significantly superior in conserving the parasite and predatory populations compared to the existing (bollworm based) schedule as well 858 schedule involving some new and highly effective insecticides.

Keywords

Parasites, Predators, Bemisla tabaci, Cotton Varieties, Integrated Management Programme.

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N. Venugopal Rao ¹, A. S. Reddy ², D. D. R. Reddy ³

Affiliations
1 Regional Agricultural Research Station, Lam, Guntur 522034, A.P., IN
2 Regional Agricultural Research Station, Nandyal, IN
3 Department of Entomology, College of Agriculturc, Rajendranagar, Hyderabad 500 030, IN

Abstract

In an evaluation of the effects of different insecticides against the natural enemies of whitefly, Bemisia tabaci Genn., cotton crop treated with synthetic pyrethroids recorded 9.7 per cent parasitism due to aphelinid and it was on par with endosulfan. Pyrethroids were highly detrimental to the predators, recording the lowest number of 2 to 4.3 of early and 0.3 to 1.2 late occurring predators per 10 leaves. The insecticides of natural origin showed 15.8 to 18.1 per cent parasitoid activity and maintained 3.4 to 7.9 predators/l0 leaves. Triazophos and deltaphos recorded the lowest parasitism and predation levels, whereas fenpropethrin recorded a higher level (14.8 per cent) of parasitism.

Keywords

Aphelinid Parasitoid, Predators, Bemisia tabaci, Synthetic Pyrethroids, Natural Insecticides.

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