oa Journal of the Entomological Society of Southern Africa - Organophosphate resistance in California red scale (Homoptera: Diaspididae) on citrus in the eastern Cape and the effect of oil as an organophosphate synergist
Populations of California red scale, Aonidiella aurantii (Maskell), in the eastern Cape Province of South Africa acquired operational resistance to organophosphates in 1984, nine years after resistance occurred in the Transvaal. A bio-assay comparing the efficacies of chlorpyrifos, methidathion, prothiofos, parathion and phenthoate at 0,053 of their field dosages was conducted using resistant red scale crawlers. The results showed that the crawlers were resistant to all these organophosphates as had been found in the Transvaal in 1976.
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