New Acaricides for Control of Citrus Red Mite, 1948–19501

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Abstract
P-chlorophenyl-p-chlorobenzenesulfonate (K-6451) was effective against the egg and newly hatched stages of Paratetranychus citri but was relatively ineffective against adults. Comparatively small quantities of the following materials, added to the spray applications, gave adequate initial kill of adults but did not improve the ultimate control bis-(p-chlorophenoxy)-methane, (K-1875), 2-(p-tert.-butylphenoxy) isopropyl 2-chloroethyl sulfite (88R), parathion, tetraethyl pyrophosphate, and tetraethyl dithiophosphate. More effective control was obtained as the dosage of K-6451 was increased up to 16 lbs./acre. At equivalent dosages, K-6451 gave more effective control than K-1875. Emulsive formulations of K-6451 gave more effective initial kill than wettable powder formulations but there were no measurable differences in residual effectiveness. No injury has been observed on citrus. Compound 88-R was toxic to all stages of the mite, and its residues remained toxic to adults for 32 days under certain field conditions. At equivalent dosages Compound 88-R was generally more effective than Compound K-1875. More consistent control with Compound 88-R was obtained as the dosage was increased from 2-8 lbs./acre. Wettable powder formulations generally gave more effective control than emulsive or emulsion formulations. Injury to citrus was negligible. The following acaricides were less effective than Compound K-1875: 1,1-bis-(p-chlorophenyl)-ethanol; 2,4-dichlorobenzenesulfonate; lorol-2-thiazolinyl sulfide; p-chlorophenyl phenylsulfone; and 4,6-dinitro-2-caprylphenylcrotonate.

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