Author(s):

VK Bhamare, GR Wahekar, DR Bankar, PB Hajare, RS Mahajan, BA Thakre and AS More

Abstract: An investigation was undertaken to study the bio-efficacy, persistence and residual toxicity of different insecticides viz., chlorantraniliprole 0.004 per cent, ethion 0.100 per cent, triazophos 0.050 per cent, indoxacarb 0.010 per cent, emamectin benzoate 0.001 per cent, quinalphos 0.050 per cent and profenophos 0.100 per cent against Empoasca kerri (Pruthi) infesting soybean at the Research Farm of Department of Agril. Entomology, College of Agriculture, Latur (MS). The overall results concluded that all the insecticides under investigation were significantly superior over untreated control in minimizing the population of E. kerri. Among the treatments, profenophos 0.100 per cent was found to be the most effective insecticide in minimizing the population of E. kerri on soybean (3.83 and 2.60 jassids per three leaves) followed by quinalphos 0.050 per cent (4.03 and 2.90 jassids per three leaves), triazophos 0.050 per cent (4.47 and 3.50 jassids per three leaves), chlorantraniliprole 0.004 per cent (5.03 and 3.60 jassids per three leaves), indoxacarb 0.010 per cent (7.20 and 5.00 jassids per three leaves), emamectin benzoate 0.001 per cent (7.40 and 5.40 jassids per three leaves) and ethion 0.100 per cent (7.67 and 5.50 jassids per three leaves) after first and second sprays, respectively. The highest grain yield was achieved by chlorantraniliprole 0.004 per cent (34.87 q per ha) while quinalphos 0.050 per cent (1:19.72) exhibited highest incremental cost benefit ratio. The results on residual toxicity of different insecticides against E. kerri infesting soybean indicated that profenophos 0.100 per cent and quinalphos 0.050 per cent illustrated highest persistent toxicity index (PT) (864.67 and 873.18 and; 815.74 and 822.85, respectively) and LT₅₀ values (6.80 and 7.02 and; 5.91 and 6.11 days, respectively) against E. kerri after first and second sprays as compared to other insecticides.

DOI: 10.22271/phyto.2021.v10.i1e.13331

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