Ethion, A Promising New Acaricide and Insecticide

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Abstract
Ethion is identified chemically as 0,0,0'' ,0''-tetraethyl S,S''-methylene diphosphorodithioate and has been known under the name of Niagara 1240. Results from 2 years of field tests demonstrated that the compound was effective against two species of aphids on apples, two species of foliage mites and the codling moth. On apples 2 lbs. of 25% wettable powder per 100 gallons, applied when trees were either in dormant or delayed-dormant stage of development gave good control of the apple grain aphid, Rhopalosiphum fitchii and the rosy apple aphid, Anuraphis roseus. One pound of ethion wettable powder per 100 gallons applied in pre-pink or in the early post-bloom period provided control of the European red mite, Panonychus ulmi. When applied in mid-season ethion at the rate of 1 lb. of 25% wettable powder was also effective for the control of the two-spotted spider mite, Tetranychus telarius. The use of ethion at the 2 lb. rate in all post-bloom sprays resulted in control of the codling moth, Carpocapsa pomonella, equal to such standard control chemicals as lead arsenate, DDT and parathion. Lower concentrations were not commercially effective.

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