Effects of insecticide spray application on insect pest infestation and yield of cowpea (Vigna unguiculata (L.) Walp.) in the Transkei, South Africa
W. D. Dzemo1, A. S. Niba1* and J. A. N. Asiwe2
¹Department of Zoology, Walter Sisulu University, P/B X1 NMD Mthatha 5117, South Africa.
²Agricultural Research Council (ARC), Small Grain Institute, Private Bag X29, Bethlehem 9700, South Africa.
Email: [email protected]