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