Studies of Some Adsorbed Insecticides

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Preliminary tests at the South Carolina Experiment Station by the writer show that chewing insects like the potato beetle (Leptinotarsa decemlineata Say) and the Mexican bean beetle (Epilachna corrupta Muls.) can be killed and controlled by adsorbed insecticides. Soluble arsenicals, sodium arsenate, sodium arsenite, potassium arsenate, and potassium arsenite carried by dusts of kaolin, diatomaceous earth, Fuller's earth, talc and tripoli were used.

Chemical analyses showed that when these carriers are mixed with quantities of aqueous solutions containing a water soluble arsenical that will just thoroughly wet the carrier and then dried, that they will retain only a very small portion of the arsenical (less than 1%) arsenic As. in a way to prevent it from being water soluble when the dust is analyzed for total and water soluble arsenic. The amount of arsenic adsorbed is variable and in this case seems to depend chiefly on the carrier and to a less extent on the arsenical. When sodium hydroxide was used with the toxins the .adsorbed arsenic was decreased.

When the carriers were mixed with a large excess of the soluble arsenical solutions and then washed, filtered, and dried, the quantity of arsenic carried from the solutions averaged larger than that adsorbed in the previous experiment. The amount of arsenic carried from the solutions depended chiefly on the carrier used and to a less extent on the arsenical. The order of the carriers when arranged according to the relative amount of arsenic carried out of the solutions is different from that of the first experiment when arranged according to the quantity of arsenic adsorbed.

Document Type: Research Article

Publication date: February 1, 1926

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  • 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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