1Present Address: Jitpurkampa, P.O. Vadagam, Taluk Dhansura, District Aravali, 383307
Department of Agricultural Entomology, C.P. College of Agriculture, Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar, 385506, E-mail: senganisumit26@gmail.com
Online published on 3 November, 2015.
Bioefficacy of botanical insecticides evaluated under laboratory conditions on Bt cotton revealed that tobacco leaf extract 5% was the best treatment and it gave 73.45% mortality of the first instar nymph of mealy bug Phenacoccus solenopsis within 48 hours. The datura leaf extract 5% (73.45%), NSKE 5% (69.96%) and ardusa leaf extract 5% (63.37%), respectively were found highly effective against the first instar within 72 hours. In case of the third instar, the tobacco leaf extract 5% was observed with 79.97% mortality within 72 hours. The treatments of NSKE 5% (66.69%) and datura leaf extract 5% (66.72%) were found highly effective against the third instar after 72 hours of application.
Plant leaf extracts, Mealy bug, first, second and third instar, tobacco leaf extract
