Abstract
Insecticide resistance within mite populations and seasonal shifts of mite infestations from a predominance of Banks grass mite, Oligonychus pratensis (Banks), to a complex which includes the two spotted spider mite, Tetranychus urticae Koch, complicate mite control in corn on the Texas high plains. Field efficacy trials from 1977 to 1987 showed that the registered insecticides did not adequately control Banks grass mite on corn. Monocrotophos was the only chemical evaluated that consistently controlled Banks grass mite for longer than 1wk under field conditions. In laboratory bioassays, we identified a high level of heterogeneity in mite susceptibility to most chemicals and higher tolerance in the twospotted spider mite. Several combinations of insecticides with a synergist and other insecticides were highly toxic to mites and could be important for improving field control. The combinations of bifenthrin + formamidine and dimethoate + pyrethroids were very toxic to mites.
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