Biorational approaches for management of aphid (Hyadaphis coriandri Das) on fennel

Abstract

A field experiment was conducted for two years on management of aphid (Hydaphis coriandri Das) on fennel through application of biorational products based on entomopathogenic fungi, release of predators, plant products alone and in combination of entomopathogenic fungi and insecticidal check. The maximum protection against aphis on crop and seed yield was recorded in insecticidal check Deltamethrin 0.003%. However, alone application of Verticillium lacanii, applied as aqueous suspension along with Tween 80, 0.02% + 0.2% vegetable oil ( 108 spores/ml), neem oil-2% and sulphur extract of karanj-1% gave good control of aphids and yield of seed fennel at harvest. The application of entomopathogen in combination with neem oil showed reduced impact on aphid control and yield than alone application of either product as treatments. Among the biorational approaches applied, maximum increase in yield (46.5%) over control was recorded in treatment containing 2% neem oil followed by sulphur extract of karanj.