Further Investigations With Japanese Beetle Repellents

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Abstract
A new composition of tetramethyl-thiuram disulfide which greatly improves the retention of the active agent, is more effective in preventing feeding by the Japanese Beetle than twice the conc. of derris when used in a 3-spray schedule during the beetle season. With the possible exception of zinc or aluminum sulfates and lime, all stickers investigated reduced the efficiency of this thiuram disulfide composition. Tetramethylthiuram disulfide reacts with Cu and should not be used in combination with Bordeaux mixture or before or after Bordeaux or other Cu sprays. It can be safely mixed with Pb arsenate, hydrated lime, wettable sulfur, phenothiazine, or derris. Phenothiazine, while not equal to the thiuram disulfide. remains of interest and might have the added advantage of controlling codling moth in areas where this insect is a serious problem.

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