Evaluation of neem seed oil as tuber protectant against Phthorimaea operculella Zell. (Lepidoptera, Gelechiidae).
Neem seed extract at 20, 40, 60, 80 and 100 p.p.m. was compared with Sevin 10% [carbaryl] (at 1.0 kg/ton potatoes) for control of Phthorimaea operculella on potatoes stored covered with a rice hill in a store in Menoufiya, Egypt, in summer 1990. Storage losses after 6 months in potatoes treated with 100 p.p.m. neem oil and carbaryl were 25 and 10%, resp. In laboratory experiments, 100 p.p.m. neem oil and carbaryl caused 78.57 and 88.1% mortality of larvae, resp., and both allowed only 10% successful pupation. All adults emerging from pupae of larvae treated with 100 p.p.m. neem oil were deformed.