Bio-efficacy of insecticides and biorationals against the incidence of whitefly, Bemisia tabaci (Genn.) and yellow mosaic virus in mungbean

Whitefly, Bemisia tabaci (Genn.) and yellow mosaic virus disease incidence in mungbean, Vigna radiata (L.) Wilczek is a most serious problem in northern states of India. Bioefficacy of some insecticides and biorational were tested during kharif 2010 to 2011 and 2011 to 2012 at Pulses Research Farm, Department of Genetics and Plant Breeding, CCS Haryana Agricultural University, Hisar. The results revealed that 30 days after sowing minimum whitefly population was recorded in plots, when seeds were treated with dimethoate 5 ml/kg seeds. At three days after spray application lowest whitefly population (1.6 and 6.4 adults/ cage/ plant) was noted in NSKE 5 per cent sprayed plots. At seven days after spray, NSKE 5 per cent and triazophos 0.04% was the most effective in keeping the whitefly incidence and yellow mosaic virus infection low. Triazophos and NSKE did not help in managing the whitefly population at low level up to 10 days after spray application. Spraying of triazophos 0.04% resulted in higher grain yield as well as net profit. Lower dosage of triazophos 40EC at 0.02% enhanced the whitefly population in 2011 to 2012. However, the maximum incremental cost benefit ratio (1:13.41) was obtained in dimethoate 5 ml/kg seed treated plots followed by seed treatment with dimethoate plus spraying of triazophos 0.04% (1:11.93).   Key words: Bioefficacy, biorational, insecticides, whitefly, yellow mosaic virus.