COCOS - Journal of the Coconut Research Institute of Sri Lanka
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Item Development of a method for mass rearing of neoseiulus baraki, a mite predatory on the coconut mite, aceria guerreronis(CRI. Lunuwila, 2004) Fernando, L.C.P.; Aratchige, N.S.; Kumari, S.L.M.L.; Appuhamy, P.A.L.D.; Hapuarachchi, S.L.M.L.Item Stem bleeding incidence of coconut in Hambantota district(Coconut Research Institute. Lunuwila, 1998/1999) Wijesekara, H.T.R.; Rajapakse, C.N.K.; Fernando, L.C.P.; Jayasinghe, C.K.; Manoher, S.P.; Perera, K.F.G.A heavy incidence of stem bleeding in coconut palms was reported during 1995 in Hambantota district, Sri Lanka. Palm to palm survey and laboratory investigations were conducted to determine the incidence, distribution, and cause of the epidemic. The durvey revealed that 10% of the palms in the district was affected. The stem-bleeding incidence was higher in palms closer to water bodies and irrigation channels in the area. The investigations were unable to establish the cause of stem bleeding. The distribution pattern of affected palms suggests that irrigation water may cause stem bleeding and predispose palms to the infection by Ganoderma sp. the fungus Ganoderma, which causes bole and root rot disease of coconut was consistently isolated from the palms with fruiting bodies, and authenticity of the pathogen was proved by the international mycological institute, UK,. Further studies are necessary to determine the role of water bodies in predisposing the palms to the disease.Item More evidence on the attraction of males to the female sex phermone of Opisina arenosella walker(Coconut Research Institute of Sri Lanka. Lunuwila, 1997) Fernando, L.C.P.; Chandrasiri, K.A.S.Item New records of some pests of the coconut inflorescence and developing fruit and their natural enemies in Sri Lanka(CRI, 1987) Fernando, L.C.P.; Kanagaratnam, P.Item Some studies on the use of Metarhizium anisopliae (Metsch.) Sor. for the control of Oryctes rhinoceros in Sri Lanka(Coconut Research Institute of Sri Lanka. Lunuwila, 1994-95) Fernando, L.C.P.; Kanagaratnam, P.; Narangoda, N.K.Black beetle, oryctes rhinocers L. larvae and adults were inoculated in the laboratory with three isolates of the fungus Metarhizium anisopliae (Metsch.) Sor, to screen their virulence against black beetle. ALl the isolates caused 100 per cent mortality of larvae and adults when treated with suspensions of 10(7) conidia/ml. Comparatively the local isolate caused a slow death rate in larvae and adults than the other isolates. Fifty grams of the maize inoculum per 0.008 m2 of breeding medium were sufficient to cause 100 per cent death rate of larvae. In the field, the fungus was capable of disseminating at least 10 m and the impregenation boxes (infection foci) were attractive to black beetle. It is suggested that M.anisopilae could be used as an effective bio-control agent in the intergrated management of black beetle.Item Effectiveness of used engine oil in the management of coconut mite, Aceria guerreronis (Acari:Eriophyidae)(CRI. Lunuwila, 2004) Chandrasiri, K.A.S.; Fernando, L.C.P.