Bioefficacy of some newer insecticides against cabbage butterfly, Pieris brassicae in cabbage
Keywords:Cabbage butterfly, Pieris brassicae, cabbage, insecticides, field efficacy, yield
AbstractNewer insecticides like novaluron 10 EC @ 250, 312.5 and 375 ml ha-1, spinosad 2.5 SC @ 600 ml ha-1,Â indoxacarb 15.8 SC @ 500 ml ha-1 and flubendiamide 480 SC @ 75 ml ha-1 were evaluated for their efficacyÂ against P. brassicae and compared with conventional insecticides like quinalphos 25 EC and endosulfan 35Â EC @ 1000 ml ha-1 and Bt biopesticides, Dipel and Halt. The pre-treatment population of P. brassicae larvaeÂ varied from 6.20 to 7.10 and 6.80 to 7.60 larvae/plant during 2010 and 2011 crop seasons, respectively.Â In 2010, lowest P. brassicae population was observed in novaluron @ 375 ml ha-1 while during 2011, itÂ was lowest in flubendiamide @ 75 ml ha-1 after 3 days of spray. After 7 and 10 days of spray, lowest larvalÂ population was observed in novaluron @ 375 ml ha-1 during both the years. Yield of cabbage heads wasÂ significantly higher in treated plots than in the untreated control. Cabbage head yield during 2010 andÂ 2011 was highest in plots treated with novaluron @ 375 ml ha-1 (171.75 and 210.82 q ha-1, respectively)Â with maximum of 16.05 and 45.39 per cent yield increase over the control, respectively. Overall, the studyÂ revealed that the newer insecticides such as novaluron, spinosad, indoxacarb and flubendiamide can beÂ used for the management of P. brassicae on cabbage.
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