Control of Mites on Apple Trees Sprayed with DDT

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Abstract
Tests with new materials used in 1947 and 1948 to control European red mite and Tetrany-chus schoenei are summarized. The following miticides were most effective in the order named: di (4-chlorophenoxy) methane, dioctyl pthalate and parathion. Parathion was also found to be highly toxic to codling moth larvae, whereas the other miticides had little or no effect on this insect. Hexaethyl tetraphosphate and tetraethyl pyrophosphate gave erratic results due to the absence of any residual action; the former was used commercially and proved to be ineffective after 4 successive applications.

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