Management of tobacco whitefly, Bemisia tabaci in Virginia tobacco
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Keywords:Tobacco, insecticides, tobacco leaf curl virus, Bemisia tabaci, Coccinella repanda, Nesidiocoris tenuis, Nicotiana tabacum
AbstractTobacco whitefly, Bemisia tabaci Gennadius is an important pest of tobacco in India and it transmits theÂ dreaded tobacco leaf curl virus (TLCV) disease. A replicated field experiment was conducted for twoÂ seasons during2012-13 and 2013-14 in Virginia (FCV) tobacco (Nicotiana tabacum) cv. Siri to evaluateÂ certain new insecticides for the management of thewhitefly by carrying out field experiments on efficacyÂ against the pest, incidence of TLCV, effect on the natural enemies of the whitefly and persistent toxicityÂ studies. The white fly population and the incidence of TLCV were least in the treatment of diafenthiuron 50Â WP @ 0.05%. Among others, pymetrozine 50 WG @ 0.02%, spiromesifen 240 SC @ 0.02% and flonicamidÂ 50 WG @0.02% recorded lower whitefly population, whereas pymetrozine and flonicamid showed theÂ lowest leaf curl virus disease incidence. Among the effective insecticides against whitefly, pymetrozine,Â flonicamid, spiromesifen and thiamethoxam were found to be relatively safe to the native insect predators,Â Coccinella repanda and Nesidiocoris tenuis. The insecticides pymetrozine and flonicamid recorded higherÂ cured leaf, bright leaf and better grade index than others and can be used for management of the TLCVÂ vector in Virginia tobacco.
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