Toxicity of Various Sulphur and Phosphorus Compounds Applied as Sprays on Spider Mites and Aphids1

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Abstract
In laboratory tests against Tet-ranychus opuntiae and Aphis gossypii the following compounds are listed in order of their effectiveness. Tetraethyl pyrophos-phate, parathion, diethoxy thiophosphoric ester of 4-methyl 7-hydroxy coumarin, dialkyl nitroaryl thiophosphates, tetraethyl dithionopyrophosphate, mercurted pentaethyl triphosphate and octamethyl pyrophosphoramide. S compounds tested were not effective for aphid control. The following S compounds are listed in order of their effectiveness on the mite: 2-(p-tert-butylphenoxy)-l-methyl-ethyl 2-chloroethyl sulfite), p-chloro-phenl phenyl sulfone, p-chlorophenyl p-chlorobenzene sulfonate, 2, 4 dichlorophenyl ester benzene sulfonic acid and the polysul-fide compounds. The 1, 1-bis p-chlorophenyl ethanol was not as toxic to spider mites as 2-(p-tert-butylphenoxy)-l-methyl-ethyl 2-chloroethyl sulfite, but was more toxic than the sulfone or sulfonic acid compounds. Octamethyl pyrophosphoramid remained highly toxic during the 14-day period, an indication of either residual or systemic action. The residual toxicity of the other phosphorus compounds decreased within a 10-day period. The sulfite, sulfone, sulfonic acid compounds and diethoxy thiophosphoric ester of coumarin remained toxic during the 14-day period.

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