Efficacy of different pyrethroid alone and in combination with dimethoate against girdle beetle of soybean

Field experiment on efficacy of different pyrethroid alone and in combination with dimethoate against girdle beetle of soybean was conducted during kharif season of 2011–2012 on field of Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. The experiment was planned in Randomized Block Design with gross plot size 4.5 x 3.0 m² and net plot size 3.6 x 2.6 m² with twelve treatments replicated thrice with the object to study the effect of synthetic pyrethroid in combination with dimethoate on the incidence of girdle beetle of soybean. In evaluation study twelve treatments were tested against girdle beetle Obereopsis brevis Gahan on soybean. The result revealed that treatment dimethoate 30 EC @ 0.045% deltametrin 2.8 EC @ 0.0028% and deltametrin 2.8 EC @ 0.0028% + dimethoate 30 EC @ 0.045% were found significantly effective in minimizing the cumulative mean percent infestationof girdle beetle ofsoybean. All insecticide treatments were observed to be safer to lady bird beetle and are non phytotoxic. Hence it is concluded that these combinations found beneficial for the management of girdle beetle.