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Item Deficiency diseases and the symptoms of magnesium deficiency(Tea Research Institute. Thalawakele, 1959) Mulder, D.; De Silva, R.L.Item Planting on poria-infected areas(Tea Research Institute. Thalawakele, 1960) Mulder, D.Item Black blight. a leaf-spot disease of tea in the low country caused by Rhizoctonia solani kuhn(TRI. Talawakele, 1962) Mulder, D.; Redlich, W.W.; Sabanayagam, J.V.Item Black Blight: a leaf-spot disease of tea in the low country caused by hizoctonia solani Kiihn(1962) Mulder, D.; Redlich, W.W.; Sabanayagam, J.V.Item Further observations on the oil spot disease of tea(The Tea Research Institute. Talawakele, 1963) Shanmuganathan, N.; Mulder, D.Item Review of thirty years study of tea diseases in Ceylon(Tea Research Institute. Thalawakele, 1959) Mulder, D.