Efficacy of Plant Products Against Leafhopper Amrasca Biguttula Biguttula (Ishida) in BT Cotton

Field experiments were conducted on Bt cotton at the RRS Abohar and PAU, Ludhiana to evaluate various plant products viz. castor oil, pongamia oil, crude neem oil, sesame oil, linseed oil, garlic extract along with commercial neem-based biopesticides, Nimbecidine (azadirachtin 1500 ppm) and Ecotin (azadirachtin 5000 ppm) against leafhopper, Amrasca biguttula biguttula (Ishida) in Bt cotton. Three days after application, maximum mortality was in garlic extract @ 30 ml/ l (54.00 and 52.68%) followed by neem oil @ 10 ml/ l (49.17 and 47.83%), Ecotin (azadirachtin 5000 ppm) @ 1.5 ml/ l (45.39 and 44.17%) at Abohar and Ludhiana, respectively. After five and seven days of second application, it was significantly more with Ecotin @ 1.5 ml/ l (44.56, 44.06 and 28.83, 28.17%) followed by neem oil @ 10 ml/ l (40.34, 39.95 and 28.28 and 27.67%) and Nimbecidine @ 10 ml/ l (37.33, 36.83 and 21.56, 21.17%) at both the locations, respectively. Among various plant products, maximum predator counts were obtained with in garlic extract @ 30 ml/ l. Seed cotton yield was also significantly higher in Ecotin @ 1.5 ml/ l treated plots.