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Item Plant parasitic nematodes - the invisible enemy of cultivated crops(1982) Gnanapragasam, N.C.Item Natural enemies of mite pests of tea and biological control aspects(Tea Research Institute:Thalawakele, 1999) Nagahaulla, S.M.Item The problem of scavenging termites associated with wood-rot in mid country tea plantations(Tea Research Institute:Thalawakele, 1999) Yatawatte, S.T.Item Organic tea cultivation(Tea Research Institute:Thalawakele, 1999) Gaffar, N.M.A.Item Prevention of dissemination of nematodes pathogenic to tea into hitherto uninfested tea areas(Tea Reseaech Institute:Talawakele, 1989) Gnanapragasan, N.C.Item A guide for calculations involved in pesticide usage on plantations(Tea Reseaech Institute:Talawakele, 1988) Vitarana, S.I.Item New pests on tea lands in Sri Lanka black ant, Crematogaster dorhni(Tea Research Institute:Talawakele, 1988) Vitarana, S.I.Item The use of insecticides in tea(Tea Reseaech Institute:Talawakele, 1987) Thirungnanasuntharan, K.Item Tea cultivation in Korea(TRI:Talawakele, 1988) Samarasingham, S.