oa Journal of the Entomological Society of Southern Africa - Ecology of the citrus red mite, Panonychus citri (McGregor) (Acarina: Tetranychidae) in South Africa. 4. The influence of red-scale sprays on the population density of P. citri
In a field trial to evaluate different insecticidal treatments for the control of Aonidiella aurantii (Mask.) on citrus, the effects of the treatments on populations of Panonychus citri (McG.) and its predator Amblyseius addoensis van der Merwe & Ryke were observed for two seasons in 1966-67. Treatments with parathion in March or August and September (but not October) were generally followed by a reduction of A. addoensis and a subsequent rise of P. citri. It is suggested that the rise of P. citri was due to the temporary suppression of the predator mite by parathion. This provides an explanation for the well-attested view that the injudicious use of parathion is responsible for the appearance of P. citri as a pest of citrus in South Africa.
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