Tolerance to Piper guineense (Schum and Thonn) seed powder by populations of Callosobruchus maculatus (Fab.) obtained from six major towns spread across Ekiti State, Nigeria was investigated at ambient temperature (28±2ºC) and relative humidity (88±5%). The towns were Ado, Emure, Ijero, Ikere, Omuo and Oye Ekiti. Bruchid samples from each location were exposed to seed powder of P. guineense at 0.00, 0.05, 0.10, 0.15, 0.20, 0.25 and 0.30g/20g of cowpea seeds. Mortality was assessed at 24, 48, 72 and 96 hours post-treatment. The effects of location, dose and exposure time on the bruchids response were also analysed. The results revealed that bruchid susceptibility to P. guineense varied across locations. However, there was significant effect (p<0.001) of location, dose and exposure time on bruchid susceptibility to P. guineense while significant interactive effects also exist among these factors. At the highest (0.30g) and lowest (0.05g) experimental doses, bruchids obtained from Emure were the most tolerant (LT50: 1.19 hours and 2.45 hours respectively) while those from Ikere were the most susceptible (LT50: 0.62 hours and 1.24 hours respectively) to this botanical. Though, the response of Ekiti State C. maculatus populations to P. guineense is location dependent, there was no geographical pattern to the tolerance distribution. Keywords: Botanical, Callosobruchus maculatus, mortality, Piper guineense, susceptibility.
PAPER TITLE :TOLERANCE TO PIPER GUINEENSE (SCHUM AND THONN) POWDER AMONG EKITI STATE POPULATIONS OF CALLOSOBRUCHUS MACULATUS (FAB.)
FUTA JOURNAL OF RESEARCH IN SCIENCE | VOLUME 11 NUMBER 2 2015
- Author(s) : O.A. Gbaye., E.A. Oyeniyi and T.D Fatore