ACTION OF INSECTICIDES TO SPIDER-MITES (ACARI, TETRANYCHIDAE) ON CORN IN THE TEXAS HIGH-PLAINS - TOXICITY, RESISTANCE, AND SYNERGISTIC COMBINATIONS
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Insecticide resistance within mite populations and seasonal shifts of mite infestations from a predominance of Banks grass mite Oligonychus pratensis to a complex which includes the two-spotted spider mite, Tetranychus urticae, complicate mite control in corn. Monocrotophos was the only chemical evaluated that consistently controlled Banks grass mite for >1 wk under field conditions. There was a high level of heterogeneity in mite susceptibility to most chemicals and higher tolerance in the two-spotted 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. -from Authors
