Abstract
The acaricidal eff ect of 29 commercial agrochemicals on two pest spider mites that in fest citrus trees in Okinawa was examined under laboratory conditions. The citrus red mite, Panonychus citri, was resistant to the majority of tested agrochemicals including organophosphate insecticides, synthetic pyrethroid insecticides, and pyrazole acaricides. Some new specifi c acaricides and spiracle-blocking insecticides were eff ective against this species. The effect of some pesticides such as fenpropathrin and hexythiazox varied between local populations of P. citri. The African red mite, Eutetranychus africanus, showed susceptibility to most of the tested agrochemicals with the exceptions of fl ufenoxuron, bifenazate, and a few spiracle-blocking insecticides. The present results suggest that P. citri would be more diffi cult to control than E. africanus using agrochemicals in citrus orchards in Okinawa.
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