1. Department of Botany, Faculty of Science, University of Ruhuna, Matara, Sri Lanka
2. Department of Zoology, Faculty of Science, University of Colombo, Colombo 03, Sri Lanka
3. Plant Virology Section, Department of Agriculture, Chatuchak, Bangkok, 10900, Thailand
4. School of Biosciences, Sutton Bonington Campus, University of Nottingham, LE12 5RD, UK