1. Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
2. Department of Crop Protection, School of Agriculture and Agricultural Technology, Modibbo Adama University of Technology, P.M.B. 2076 Yola, Adamawa State, Nigeria
3. Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia