Efficacy of insecticides against grapevine mealybugMaconellicoccus hirsutus(Green)

Abstract

Grapevine mealy bug, Maconellicoccus hirsutus (Green) is one of the destructive pests and seven insecticides were evaluated against this under field conditions. It was observed that acetamiprid 20 SP @ 0.3 g/l was significantly superior but at par with thiamethoxam 25 WG @ 0.6g/l. Remaining treatments in their descending order of efficacies were lambda cyhalothrin 5 EC 1ml/l, buprofezin 25 SC @ 1.5ml/l, triazophos 40 EC @ 2ml/l, diafenthiuron 50 WP @ 2g/l and fipronil 5 SC @ 2ml/l. Also, acetamiprid 20 SP @ 0.3 g/l gave significantly highest fruit yield (25.10 t/ha) followed by thiamethoxam 25 WG @ 0.6 g/l (24.23 t/ha). Acetamiprid 20 SP @ 0.3 g/l and lambda cyhalothrin 5 EC @ 1ml/l recorded the higher incremental cost benefit ratio of 1:40.9 and 1:36.4, respectively.