Ovicidal activity of some plant extracts and insecticides on eggs of Nipaecoccus viridis (Newstead).

摘要

The effect of some plant extracts and insecticides on the eggs and hatched nymphs of the mealybug (Nipaecoccus viridis) was investigated. The treatments comprised alcohol and aqueous extracts of leaves of kurchi (Holarrhena antidysenterica [H. pubescens]) and babchi (Psoralea corylifolia) at 5 and 10%, fosmite 50 EC (ethion 50 EC) and carina 50 EC (profenofos 50 EC) at 0.025 and 0.05%, cilcord (cypermethrin 10 EC) and rocket 44 EC (40% profenofos + 4% cypermethrin) at 0.01 and 0.02%, nemazal F (5%(w/w) azadirachtin) at 0.05 and 0.10%, and water and alcohol as control. Among the treatments, carina 50 EC at 0.05% exhibited the highest ovicidal activity causing 100% egg mortality. Carina 50 EC at 0.025% and rocket 44 EC at 0.02% were the most lethalto the hatched nymphs, followed by rocket 44 EC at 0.01%.