1. Department of Civil Engineering, Faculty of Engineering, Universiti Putra Malaysia (UPM), 43400 Serdang, Selangor, Malaysia
2. Citrus Research and Education Center, IFAS, University of Florida, 700 Experiment Station Road, Lake Alfred, FL 33850, USA
3. Department of Plant Protection, Faculty of Agriculture, Universiti Putra Malaysia (UPM), 43400 Serdang, Selangor, Malaysia
4. Department of Biological Systems Engineering, Washington State University, PO Box 646120, Pullman, WA 99164, USA
5. R&D Plantation, Plant Protection, Sime Darby Research Sdn Bhd, 42700 Banting, Selangor, Malaysia