Abstract
This is a report on an investigation initiated in 1934 to provide information on substitutes for lead arsenate in codling moth control. Major emphasis has been placed on commercial calcium arsenate because that arsenical seemed to offer considerable promise of effectiveness under Iowa conditions. Its residues contain no lead and they are easily removed; besides the price of calcium arsenate is somewhat lower than that of lead arsenate. Soybean flour was brought into the investigation as a sticker and spreader in 1937. This paper describes the results obtained in the season of 1939.
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