oa Journal of the Entomological Society of Southern Africa - Ecology of the citrus red mite, Panonychus citri (McGregor), (Acarina: Tetranychidae) in South Africa. 3. The influence of the predacious mite. Amblyseius (Typhlodromalus) addoensis van der Merwe & Ryke



In laboratory feeding trials, the predacious mite, Amblyseius (Typhlodromalus) addoensis, fed only on the immature and adult stages of the citrus red mite, Panonychus citri. However, all stages of the red spider mite, Tetranychus telarius (L.), including the egg stage, were eaten by A. addoensis. Under field conditions, A. addoensis was found to be an effective predator of the citrus red mite. The variation in the numbers of P. citri observed on individual trees within an orchard could be explained by the variation in the numbers of predator mite on each tree. It is suggested that there is a critical ratio of about 3:1 between the numbers of active stages of P. citri and those of adult A. addoensis. If this ratio is exceeded then large populations of P. citri can be expected to develop.


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