Bio-efficacy, phytotoxicity and effect on natural enemies of spinetoram 12% SC w/v (11.7% w/w) SC against lepidopteran insect pests of cabbage

Abstract

Lepidopteran pests of cabbage are one of the important constraints in the production and productivity of cabbage yield. Several insecticides developed resistance and lost efficacy against lepidopteran insects, in this view, a study was undertaken to evaluate the bioefficacy of Spinetoram 12% SC w/v (11.7% w/w) SC against Lepidopteran Insect Pests of Cabbage. Lowest larval population was registered in Spinetoram 12% SC w/v (11.7% w/w) SC @ 54 g a.i/ha with 1.58 and 1.89 larvae per plant 14 days after first and second treatment imposition, respectively. Similarly, significantly lowest larval population was recorded in the treatment Spinetoram 12% SC w/v (11.7% w/w) SC @ 54 g a.i/ha with 0.62 and 0.69 larvae/plant respectively. Paper cent head damage revealed that the test compound Spinetoram 12% SC w/v (11.7% w/w) SC @ 54 g a.i/ha recorded lowest head damage with 1.62% at Spinetoram 12% SC w/v (11.7% w/w) SC @ 54 g a.i/ha. Based on the study, it can be concluded that Spinetoram 12% SC w/v (11.7% w/w) SC @ 54 g a.i/ha recorded highest yield of 21.98 tons per ha and was found to be effective in suppressing the diamondback moth, Plutella xylostella and Leaf eating caterpillar population of cabbage. The predatory populations were statistically on par with all the dosages of Spinetoram 12% SC w/v (11.7% w/w) SC as well as with the standard check treatments. There were no phytotoxicity symptoms on cabbage plants treated with various dosages of Spinetoram 12% SC w/v (11.7% w/w) SC.