Abstract
The effects of scarlet mite infestation on symptom development and yield of tea were studied in the laboratory and the fields of the Research Institute for Tea and Cinchona, West Java, Indonesia. The relations of the mite density with the presence of a necrotic leaf base and with leaf duration were determined. A field trial over one year duration where the mite densities were diversified experimentally by spraying either dicofol or copper oxychloride did not show effects on yield with average densities up to 30 eggs and mites per leaf. This density is proposed as a preliminary minimum threshold for control.
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