Browsing by Author "Gunawardena, N.E."
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Item 4-Methyl-5-Nonanol (Ferrugineol) as an aggregation pheromone of the coconut pest, Rhynchophorus ferrugineus F. (Coleoptera: Curculionidae):synthesis and use in a preliminary field assay(Natural Resources Energy Science Authority:Colombo, 1995) Gunawardena, N.E.; Bandarage, U.K.Item Behavioural and electrophysiological responses of the coconut pest, Rhynchophorus ferrugineus (Coleoptera: Curculionidae) to host, nonhost and alternate host plant volatiles(Natural Resources Energy Science Authority:Colombo, 1995) Gunawardena, N.E.; Swarnakanthi, M.N.A.Item Convenient synthesis of (E)11-hexadecenyl acetate; the female sex pheromone of the brinjal moth Leucinodes orbonalis guenee(National Science Council:Colombo, 1992) Gunawardena, N.E.Item Item E-11-hexadecenylacetate the female sex-pheromone of the brinjal shoot and pod borer, Leucinodes orbanalis(1988) Gunawardena, N.E.; Herath, H.M.W.K.B.; Attygale, A.B.Item Effect of (E)-11-hexadecen-1-ol the minor component of the sex pheromone gland on (E)-11-hexadecenyl acetate the sex pheromone of the brinjal pest Leucinodes orbonalis Guenee'in an electroantennogram assay(National Science Council:Colombo, 1993) Gunawardena, N.E.Item Electroantennogram response of the coconut pest, Rhynchophorus ferrugineus (Coleoptera:Curculionidae) to alcohols(1994) Gunawardena, N.E.; Kern, F.Item Enhancement of the activity of ferrugineol by N-pentanol in an attractant baited trap for the coconut pest, Rhynchophorus ferrugineus F. (Coleoptera: Curculionidae)(Natural Resources Energy Science Authority:Colombo, 1995) Gunawardena, N.E.; Herath, H.M.W.K.B.Item Ethyl alocohol:a major chemical attractant of red weevil (Rhynchophorus ferrugineus)(1986) Gunatilaka, R.; Gunawardena, N.E.Item Evaluation of the natural formulations as toxicants:based on the defensive secretions of two hemipterans(1993) Gunawardena, N.E.; Herath, H.M.W.K.B.Item Insect pest control:the semiochemical approach(National science foundation:Colombo, 1996) Gunawardena, N.E.Item Investigations on the field use of natural attractants for Leucinodes orbonalis and Rhynchophorus ferrugineusHerath, H.M.W.K.B.; Gunawardena, N.E.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 Major volatiles of the defence secretion of Coridius janus(1987) Gunawardena, N.E.; Ranatunga, P.R.Item Pheromone baited trap for the management of red palm weevil, Rhynchophours ferrugineus F. (Coleoptera:Curculionide) population in coconut plantation(Coconut Research Institute. Lunuwila, 1998/1999) Rajapakse, C.N.K.; Gunawardena, N.E.; Perea, K.F.G.4-methyl-5-nonanol (ferrugineol), the major component of the aggregation pheromone of rhynchophorus ferrugineus F. was evaluated as a lure for trapping of this pest in coconut plantations in Sri Lanka. Trap design, longevity of ferrugineol in field conditions, and the effect of trapping on damage incidence of R.ferrugineus were studied. N-pentanol, a known compound present in coconut stem volatiles was used in combination of ferrugineol in all tested traps. Trap designs tested were; an open plastic bucket, a funnel trap, and a modified metal trap. The open plastic bucket (5L) baited with ferrugineol -pentanol, which was hung on coconut palm stem at 1.5m, caught significatly more number of adult weevils than ferrugineol pentanol baited funnel and metal traps. An open plastic bucket trap was six times less expensive than the metal trap currently recommended by the Coconut Research Institute, Sri Lanka. Ferrugineol remained effective as a balt for 12 weeks under field conditions. High capture rates of adult R. ferrugineus were obtained in ferrugineol baited open bucket traps in plantations where the initial damage incidence was high. Monthly surveys of individual palms during pheromone trapping revealed that a sharp reduction of the number of coconut palms demaged by R. ferrugineus in 10 hectare experimental blocks. Continuous trapping of weevils with ferrugineol over a period of time significantly lowered the infestation of this pest.