Vol. 11, Issue 4 (2022)

Author(s):
Seerapu Eswar Narayana Manikanta and Ashwani Kumar

Abstract:
The experiment was conducted at the research plot of the Department of Agricultural Entomology at Central Research Field, Sam Higginbottom University of Agriculture Technology and Sciences, Prayagraj during the Kharif season of 2021, “Efficacy of certain chemicals and essential oil against okra shoot and fruit borer (Earias vittella) Fabricius’’ Seven treatments were evaluated against Earias vittella. The seven treatments are (T₁) Lambda cyhalothrin 5% EC, (T₂) Imidacloprid 17.8% SL, (T₃) Karanjin oil 2% EC, (T₄) Cypermethin 25% EC, (T₅) Neem oil 3%, (T₆) Emamectin benzoate 5% SG and (T₇) Spinosad 45% SC, (T₀) control were tested to the efficacy against Earias vittella and their influences on the yield of okra. Each insecticide was sprayed twice at 15 days interval. The shoot and fruit infestation per plant was taken day before and 3,7, and 14 days after each spray. All the insecticides tested significally reduced the pest infestation compared to control. The lowest percentage infestation of shoot and fruit borer against control was observed in cypermethin 25% EC (11.48). The mean crop yield ranged between 97.52 q/ha to 188.63 q/ha, the highest being cypermethin 25% EC (188.63 q/ha) followed by Emamectin benzoate 5% SG (175.45 q/ha). When cost benefit ratio worked out, interesting result was achieved, among the treatment studied, the best and most economical treatment T₄ Cypermethrin (1:1.49) followed by T₆ Emamectin benzoate (1:4.57).