C.S. Oaya1*, A.M. Malgwi2, M.M. Degri1, A.E. Samaila1 1Department of Agronomy, Federal University of Kashere, P.M.B. 0182 Gombe State, Nigeria 2Department of Crop Protection, Modibbo Adama University of Technology, P.M.B. 2070 Yola, Adamawa State, Nigeria (Manuscript received 12 Septe