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Field efficacy of different new insecticide molecules was evaluated against whiteflies and Yellow
mosaic virus disease in urdbean at RARS, Lam, Guntur, Andhra Pradesh for two consecutive
seasons i.e. during Rabi 2010-11 and 2011-12. Among the test insecticides, spiromesifen 240 SC @
0.4 ml/lt followed by buprofezin 10 EC @ 1.0 ml/lt werefound as the most effective treatments with
more than 75 per cent mean reduction in nymphal population of whiteflies and with below 20 per
cent incidence of YMV.Among the four neonicotinoid molecules, acetamiprid 20 SP @ 0.2 g/ltwas
found promising against whiteflies. Triazophos 40 EC @ 1.25 ml/lt was found onpar with the
neonicotiniods such as imidacloprid 200 SL @ 0.3 ml/lt, thiamethoxam 25 WG @ 0.2 g/lt and
thiacloprid 21.7 SC @ 1.25 ml/lt. All the treatments were found significantly superior over the
untreated control in reducing the incidence of YMV in blackgram. However,upto 20 to 40 per cent
incidence of YMV was observed in treated plots also, hence adoption of integrated approach is
essential for the management of YMV, rather than relying upon chemical insecticides alone.
Key words: Whitefly, YMV, spiromesifen, buprofezin, neonicotinoids, Urdbean