author(s)
Auti Nikhil Kumar and Ashwani Kumar

abstract
The present investigation entitled “Comparative efficacy of certain chemicals with biopesticides against diamondback moth, Plutella xylostella on Rabi season cabbage in Prayagraj (U.P.)” cultivar i.e. Golden acre was conducted during December to February at Central Research Farm, SHUATS, Naini, Prayagraj. A Field trial was conducted during Rabi season 2019-2020. To determine the efficacy of some bio-agent (Beauveria bassiana) botanicals (Neem oil, NSKE 5%) and chemicals (Spinosad 45 SC, Fipronil 5 SC, Nisco sixer plus, Novaluron 10EC) along with an untreated control against Plutella xylostella in Cabbage. Each insecticide was sprayed twice at 15 days intervals. The larval count per plant was taken days before and 3, 7 and 14 days after each spray. All the insecticides tested significantly reduced the pest population compared to control. The highest percent population reduction of diamondback moth larvae against control was observed in Spinosad 45 SC (53.84%). The mean crop yield ranged between 25.82 t/ha to 74.53 t/ha in the insecticidal treatment, the highest being Spinosad 45 SC (74.53 t/ha) followed by Fipronil 5 SC (68.18 t/ha). The cost benefit ratio varied from 1:1.0 to 1:3.27 in different insecticidal treatments, the highest in Spinosad 45 SC (1:3.27) followed by Fipronil 5 SC (1:297).