Arsenical Residues Found on Apples in the Pacific Northwest Throughout a Season of Typical Spraying with Lead Arsenate

Authors: CARTER, R. H.; NEWCOMER, E. J.

Source: Journal of Economic Entomology, Volume 26, Number 3, June 1933 , pp. 572-580(9)

Publisher: Entomological Society of America

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Samples of apples from trees which had been sprayed throughout the season with lead arsenate were selected before and after each spray and at harvest time and analyzed for arsenical residue. A fairly uniform minimum coating of about .006 mg./sq. cm. was found to have been maintained during the season by spraying about every ten days when growth was rapid, and every two or three weeks later on. This coating was increased to about .012 mg./sq. cm. by each of the various applications, resulting in an average coating of about 0.10 mg./sq. cm. The relationship between the residue results calculated as grains per pound and as milligrams per square centimeter is discussed. The percentages of the total accumulated residue at harvest time put on by each spray is indicated.

Document Type: Research Article

Publication date: June 1, 1933

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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