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Item Losses of tea crops caused by Exobasidium vexans message on tea(Tea Research Institute. Thalawakele, 1972) De Silva, R.L.; Murugiah, S.; Saravanapavan, T.V.Item Factors affecting productivity on tea estates in Sri Lanka -1- the impact of each field on annual crop production(Tea Research Institute. Thalawakele, 1975) De Silva, R.L.; Saravanapavan, T.V.Item Losses of crop caused by exobasidium vexans massee -2- losses on unshaded, high -yielding clonal tea(Tea Research Institute. Thalawakele, 1974) De Silva, R.L.; Saravanapavan, T.V.; Murugiah, S.