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Item Investigations on toxic, antifeedant and repellent properties of the defensive secretion of Coridius janus (Hemiptera; Pentatomidae) and a synthetic mixture of its major volatile constituents(National Science Counicl:Colombo, 1991) Pathiratne, A.; Gunawardena, N.E.; Liyanage, S.K.J.Item Trans-2-hexenal/n-tridencane combination:a natural fumigant of the defensive secretion of Coridius janus (Hemiptera: pentatomidae)(National Science Council:Colombo, 1992) Gunawardena, N.E.