Abstract
A battery of tests employing Tetranychus telarius (L.) as the test animal, Phaseolus vulgaris L. as the host plant, and a spray technique were designed to assess the immediate and residual adulticidal, nymphicidal and ovicidal effectiveness of acaricidal chemicals. Twenty commercial formulations and eighteen other organic molecules were tested. Kelthane® was the most generally effective. Chlorobenzilate®, Karathane®, Trithion® and ethion were to a greater or lesser degree effective against all stages of the mite. Tedion®, ovex and chlorbenside were effective against the immature and egg stages only. Aramite®, Dimite®, Dibrom® and malathion killed the motile stages but had little ovicidal effect. Thiodan® was among the least effective materials. The systemics, Ekatin-®, dimethoate, demeton, phosphamidon, Experimental Insecticide 18706, and Di-Syston® were primarily adulticides. Of the other organics tested only p-chlorobenzyl 2-chloroethyl sulfide and bis (p-chlorophenyl mercapto) propane gave any appreciable kill.
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