U. M. Maina*
Ramat Polytechnic Maiduguri, P.M.B. 1070, Maiduguri, Nigeria.
B. M. Sastawa
Department of Crop Protection, Faculty of Agriculture, University of Maiduguri, P.M.B.1069, Maiduguri, Nigeria.
B. M. Biu
Federal College of Education (Technical), Potiskum, Yobe State, Nigeria.
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