Bio-efficacy of insecticides against invasive pest of tomato pinworm, Tuta absoluta (Meyrick, 1917).
An attempt was made to evaluate the bio-efficacy of insecticide against Tuta absoluta under laboratory and field conditions. In laboratory bio-assay, 100% mortality was observed in case of chlorantraniliprole 18.5 SC @ 0.5 ml/l, spinosad 45 SC @ 0.4 ml/l and flubendiamide 480 SC @ 0.25 ml/l after 96 hrs of treatment. From the field evaluation of these newer insecticides against T. absoluta, maximum reduction in larval population was recorded in case of chlorantraniliprole 18.5 SC @ 40g a.i./ha (90.35%) followed by spinosad 45 SC @ 73g a.i./ha (87.58%) and flubendiamide 480 SC @ 48g a.i./ha (84.10%). Fruit yield was higher in plots treated with chlorantraniliprole 18.5 SC (22.6 t/ha) followed by spinosad 45 SC (22.2 t/ha) and flubendiamide 480 SC (21.4 t/ha) coupled with cost benefit ratio of 1: 2.10, 1: 1.95 and 1: 1.82, respectively.