Dr. Rohan Rajapakse

Director Operational Technical Secretariat
University Of Ruhuna, Matara, Sri Lanka

Highest Degree
Ph.D. in Entomology from University of Florida, Florida, USA

My URL
https://livedna.org/94.29047

Share this Profile

Area of Interest:

Plant and Soil Sciences
Entomology
Plant Pathology
Insect Behavior
Crop Protection

Selected Publications

  1. Ratnasekara, D. and R. Rohan, 2012. The potential use of indigenous plant materials against Callosobruchus chinensis L. and Callosobruchus maculatus L. (Coleoptera, Bruchidae) in stored legumes in Sri Lanka. J Biopest., 5: 88-94.
    Direct Link  |  

  2. Rajapakse, R., C. Nimal, M. Buddhi and A. Lakshman, 2012. Planning for effective weed management: Lessons from Sri Lanka. Pak. J. Weed. Sci. Res., 18: 843-853.
    Direct Link  |  

  3. Ratnasekera, D. and R.H.S. Rajapakse, 2010. Repellent properties of plant oil vapours on pulse beetle (Callasobruchus maculatus L.) (Coleoptera: Bruchidae) in stored green gram (Vigna radiata Walp.). Trop. Agric. Res. Extension, 12: 13-16.
    CrossRef  |  Direct Link  |  

  4. Rajapakse, R.H.S. and D. Ratnasekera, 2010. Pesticidal potential of some selected tropical plant extracts agains Callosobruchus maculates (F) and Callosobruchus chinensis (L) (Coleoptera: Bruchidae). Trop. Agric. Res. Extension, 11: 69-71.
    CrossRef  |  Direct Link  |  

  5. Ratnasekera, D. and R. Rohan, 2009. Studiess on the distribution and control of galls in cinnamon caused by Trioza cinnamomi Boselli in Sri Lanka. Inter. J. Trop. Agric., 15: 53-56.
    Direct Link  |  

  6. Rajapakse, R.H.S. and K.L. Wasantha, 2007. A review of identification and management of pests and diseases of cinnamon (Cinnamomum zeylanicum blume). Trop Agric. Res. Ext., 10: 1-10.
    Direct Link  |  

  7. Rohan, R., H.D.Z. Rajapakse and D. Ratnasekera, 2002. Effect of botanicals on oviposition, hatchability and mortality of Callosobruchus maculates L. (Coleoptera: Bruchidae). Entomon, India, 27: 93-98.

  8. Kudagamage, C., R.S. Munasinghe, R.H.S. Rajapakse and D. Ratnasekera, 2002. The Potential of Paecilomyces fumosoroseus in control of cabbage caterpillar. Trop. Agric., 151: 59-62.

  9. Kudagamage, C., H.D.Z. Rajapakse, R.H.S Rajapakse and D. Ratnasekera, 2001. The population dynamics and insecticidal control of three leaf hoppers, Amritodus brevistylus, Idioscopus nivesoparus and Idioscopus clypealis (Homoptera: Cicedellidae) in mango. Indian J. Ent. Res., 25: 121-125.
    Direct Link  |  

  10. Ratnasekera, D. and R.H.S. Rajapakse, 1999. Preliminary observations on identification and life biology of some important insect pests of cashew. Cashew Bull., 2: 1-8.

  11. Rajapakse, R.H.S., S. Senanayake and D. Ratnasekera, 1998. The effect of five botanicals on oviposition adult emergence and mortality of Callosobruchus maculates on cowpea. J. Entomol. Res., 22: 117-122.
    Direct Link  |  

  12. Rajapakse, R.H.S., 1998. The integrated management of important cashew insect pests of Sri Lanka: a case study of the tea mosquito, Helopeltis antonii and the root and stem borer, Plocaederus ferrugineus. Cashew Bull., 1: 9-14.
    Direct Link  |  

  13. Rajapakse, R.H.S. and S. Senanayake, 1997. Effectiveness of seven vegetable oils against Callosobruchus chinensis L. in pigeon pea Cajanus cajan L. Entomol., 22: 1-5.
    Direct Link  |  

  14. Rajapakse, R.H.S. and D. Ratnasekera, 1997. Studies on the distribution and control of leaf galls in cinnamon caused by Trioza ciunamomi boselli in Sri Lanka. Inter. J. Trop. Agric. 15: 53-56.

  15. Rajapakse, R. and H.F. van Emden, 1997. Potential of four vegetable oils and ten botanical powders for reducing infestation of cowpeas by Callosobruchus maculatus, C. chinesis and C. rhodesianus. J. Stored Prod. Res., 33: 59-68.
    CrossRef  |  Direct Link  |  

  16. Rajapakse, R.H.S., 1996. The effect of four botanicals on the oviposition and adult emergence of Callosobruchus maculates. Entomol., 21: 211-215.
    Direct Link  |  

  17. Rajapakse, R.H.S., V.H. Waddill and T.R. Ashley, 1992. Effect of host age, parasitoid age and temperature on interspecific competition between Chelonus insularis, Cotesia marginiventris, and Microplitis manilae. Insect Sci. Appli., 12: 87-94.
    CrossRef  |  Direct Link  |  

  18. Rajapakse, R.H.S., T.R. Ashley and V.H. Waddill, 1991. Interspecific competition of fall armyworm parasites Cotesia marginiventris, Microplitis manila, and Chelonus insularis. Insect Sci. Appli., 12: 473-480.

  19. Rajapakse, R.H.S. and K.W. Jayasena, 1991. Plant resistance and a biopesticide from lemon grass for suppressing Spodoptera litura in peanut. Agric. Int., 43: 166-167.

  20. Rajapakse, R.H.S., 1990. The impact of native parasites on rice leaf folder larvae Cnaphalocrocis medinalis in Southern Sri Lanka. Entomol., 15: 207-212.

  21. Rajapakse, R.H.S. and K.W. Jayasena, 1989. Investigations on vectors of leaf curl of chillie pepper and tomato. Inter. J. Trop. Agric. 7: 274-280.

  22. Rajapakse, R.H.S. and K.W. Jayasena, 1989. Field pest problems of mungbean Vigna radiate in Southern Sri Lanka. Entomol., 14: 159-164.

  23. Jayasena, K.W., R.H.S. Rajapakse and D.V.R. Reddy, 1988. First report of tomato spotted wilt virus infecting peanut in Sri Lanka. Plant Dis., 72: 912-914.

  24. Rajapakse, R.H.S., T.R. Ashley and V.H. Waddill, 1985. Biology and host acceptance of Microplitis manila (Hymenoptera: Braconidae) raised on fall armyworm larvae Spodoptera frugiperda (Lepidoptera: Noctuidae). Florida Entomol., 68: 653-657.

  25. Rajapakse, R.H.S., V.L. Kulasekera and S.K. Charles, 1983. Laboratory studies on the rate of development and oviposition of Callosobruchus chinensis L. on different varieties of green gram (Phaseolus aureus Roxb.) DDR, Germany, 21: 347-353.
    Direct Link  |  

  26. Rajapakse, R.H.S. and K. Jeevaratnam, 1983. Seasonal population fluctuation of Helopeltis antonii sign. Agric. Res. J. 21: 38-42.

  27. Rajapakse, R.H.S. and V.L. Kulasekera, 1982. Some observations on the insect pests of cinnamon in Sri Lanka. Entomon, India, 7: 221-223.
    Direct Link  |  

  28. Rajapakse, R.H.S. and K. Jeevaratnam, 1982. Use of a virus against root and stem borer Plocaederus ferrugineus in Cashew. Insect Sci. Appli., 3: 49-51.
    CrossRef  |  Direct Link  |  

  29. Rajapakse, R.H.S. and H.M.W. Herath, 1982. Transmission and host susceptibility of three viruses isolated form Carica papaya in Sri Lanka. Mysore J. Agric. Sci., India, 16: 306-309.

  30. Rajapakse, R.H.S., 1981. Susceptibility of papaya cultivars to papaya mosaic in Sri Lanka. Madras Agric. J. 68: 406-407.
    Direct Link  |  

  31. Rajapakse, R.H.S., 1981. Biochemical analysis of healthy and mosaic virus infected papaya leaves. Madras Agric. J. 68: 458-460.

  32. Rajapakse, R.H.S. and V.L. Kulasekera, 1981. Rhizome rot of cardamom Elettaria cardamomum (Maton). J. Plan Crops. India, 9: 56-58.
    Direct Link  |  

  33. Rajapakse, R.H.S. and H.M.W. Herath, 1981. Vectors of papaya mosaic virus in Sri Lanka. Beitrage zur tropischen landwirscaft und veterinamedicin. DDR, Germany, 19: 359-361.

  34. Rajapakse, R.H.S. and H.M.W. Herath, 1981. Host susceptibility of papaya mosaic virus in Sri Lanka. Beitrage zur tropischen landwirschaft und veterinamedicin. DDR, Germany, 19: 429-432.

  35. Jeevaratnam, K. and R.H.S. Rajapakse, 1981. Studies on chemical control of the mirid bug Helopeltis antonii Sign. Int. J. Trop. Insect Sci., 1: 399-402.
    CrossRef  |  Direct Link  |  

  36. Jeevaratnam, K. and R.H.S. Rajapakse, 1981. Biology of Helopeltis antonii sign. Entomon, India, 6: 247-251.

  37. Rajapakse, R.H.S., 1980. Root rot of cashew seedlings. J. Nat. Agric. Soc., 16: 99-103.
Member since June, 2019