Lethal effects of Anarcadium occidentale (L.), Carica papaya (L.)and Azadirachta indica (A. Juss) leaf powders on Sitophilus oryzae (L.) in rice grains
Akunne C.E., Obiefuna O.I. and Ononye B.U
Bioinsecticides prepared from three plant species, Anarcadium occidentale (cashew), Carica papaya (pawpaw)and Azadirachta indica (neem) were used against adult rice weevil, Sitophilus oryzae on rice grains respectively. The leaf powders were applied separately on rice grains in the concentrations of 0 g (Control), 5 g, and 10 g respectively. They were evaluated under ambient laboratory conditions Mortality of adult S. oryzae were taken daily for a period of 21 days and compared with the control. All concentrations recorded higher mortality than the control. The leaf powders of A. indica and A. occidentale caused the highest mortality at 10g concentration in treated rice grains. The analysis of variance result showed that there was significant difference between mortality caused by A. indica and the control (P<0.05).