Preparations Containing Rotenone for Use as Insecticides. I. Aqueous Suspensions

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Aqueous suspensions of rotenone were prepared by two general methods, namely: the addition of rotenone solutions in water miscible solvents to water and the mixing of powdered preparations of rotenone with water. Numerous solvents and protective colloids were tested. Permanent suspensions containing 0.05 to 0.5 gram of rotenone per liter and having the rotenone in a highly dispersed condition were obtained by the addition of pyridine solutions and acetone solutions containing tannic acid to water. Mixtures of certain dry protective materials with precipitated rotenone also gave satisfactory suspensions, when first made into a paste with water and then diluted to the desired concentration.

Permanent suspensions of rotenone were more readily obtainable in slightly alkaline conditions. It was found difficult to obtain lasting suspensions in hard water. Reference is made to entomological tests previously made with these suspensions.

Document Type: Research Article

Publication date: February 1, 1931

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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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