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Item Chemical and biological control of insects in perennial crops. a review(Tea Research Institute. Thalawakele, 1952) Webster, B.N.Item Chemical control of the root-lesion nematode, Pratylenchus loosi, in new tea plantings(Tea Research Institute. Thalawakele, 1980) Sivapalan, P.; Gnanapragasam, N.C.; Jebamalai, A.S.