1. Postgraduate Institute of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka
2. Postgraduate Institute of Science, University of Peradeniya, Peradeniya, Sri Lanka
3. Department of Zoology, Faculty of Science, University of Peradeniya, Peradeniya, Sri Lanka
4. Department of Agricultural Biology, Faculty of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka