TOXICITY OF Piper guineense SCHUM AND THONN AND Chlorpyrifos POWDERS FOR THE CONTROL OF Callosobruchus subinnotatus (Pic.) ON STORED Vigna subterranea (L.) Verdcourt IN GOMBE STATE, NIGERIA

A study was conducted with aim of determining toxicity effects Piper guineense and chlorpyrifos powders on adult mortality Callosobruchus subinnotatus, progeny emergence (F1), damage weight loss, germination Bambara nuts. Study carried out at Botany laboratory, Gombe State University, State, Nigeria. P. were mixed 0.0g 0.8g concentration 20g nuts inside 1000ml plastic containers. Experiment in randomized complete block design three replicates. Ten pairs C. subinnotatus unsexed introduced into treatments stored for 7days. Bruchid mortality, emergence, nut assessed. Data obtained subjected to analyses variance, significant differences treatment mean separated using New Duncan’s multiple range test 5% probability level. had comparable effects, causing 100% between 5-7 days treatment. proved effective as lower observed compared control. Progeny under control 93.42% higher than treated chlorpyrifos, respectively. did not cause reduction seed germination. recommends is a reliable organic material that could offer protection against