Vol. 7, Issue 3 (2019)

An investigation was undertaken to study the bio-efficacy, persistence and residual toxicity of different newer insecticides against aphids on sunflower at research farm of department of Agril. Entomology College of agriculture Latur. The observations on total number of aphids were recorded on top, middle and bottom leaves of five randomly selected plants from each treatment at one day before and 1, 3, 7 and 14 days after first and second application of insecticides. All insecticide treatments were found significantly superior over untreated control in minimizing the incidence of aphids. On 14th DAS, the population of aphids was ranged 4.20 to 7.60 aphids/leaf and 3.40 to 6.80 aphids/leaf after first and second spray respectively. Imidacloprid 17.8 SL0.003 per cent was exhibited most effective insecticide in minimizing the aphids population (4.20 and 3.40 aphids/leaf) followed by spinosad 0.007 per cent (5.40 and 4.60 aphids/leaf), indoxacarb 0.05 per cent (5.80 and 5.00 aphids/leaf), chlorantraniliprole 0.005 per cent (6.60 and 5.80 aphids/leaf) emamectin benzoate 0.002 per cent (7.20 and 6.40 aphids/leaf), fenpropathrin 0.01 per cent (7.40 and 6.60 aphids/leaf) and flubendiamide 0.007 per cent (7.60 and 6.80 aphids/leaf) 14 days after first and second spray, respectively. Among different insecticides, imidacloprid, spinosad and indoxacarb exhibited highest efficacy against sunflower aphids. The residual toxicity of seven label recommended insecticides viz., Imidacloprid 0.003 per cent, spinosad 0.007 per cent, indoxacarb 0.05 per cent, chlorantraniliprole 0.005 per cent, emamectin benzoate 0.002 per cent, fenpropathrin 0.01 per cent and flubendiamide 0.007 per cen was evaluated against aphids Aphis gossipy (Glover) infesting sunflower. Imidacloprid 0.003 per cent revealed the highest persistent toxicity index (PT) value of (889.63 and 877.80) and LT50 values 6.62 and 6.44 days against aphids Aphis gossipy (Glover) after first and second spray, respectively as compared to the other insecticides.