Lethal Effects of Aqueous Formulations Containing Fatty Amines or Acids Against Eggs and Larvae of Aedes aegypti1,2,3

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Abstract:

Various aqueous ovicidal formulations, some of which pose minimum hazards for higher organisms, are described for use against Aedes aegypti (L.). These ovicides appear to attack mainly layers of the eggshell which resist water permeability, an attack which causes the egg to dehydrate and collapse under ambient conditions. Humidity effects were studied before and after treatment. Basic and acidic formulations containing both nonpolar and polar compounds were found effective against either dry or moist eggs exposed to ambient conditions after treatment. The basic mixture contained a nonpolar long-chain aliphatic amine such as octylamine emulsified in an aqueous solution of a polar compound such as ethanolamine or urea, and the acidic mixture contained a nonpolar fatty acid such as octanoic acid in aqueous polar mer-capto acid. Nonpolar compounds alone in water were ovicidal under special conditions. An emulsion of fatty acid in water was effective against eggs exposed to high humidity before or after treatment, and aqueous fatty amines were ovicidal for eggs exposed to high humidity after treatment.

Fatty amines, ranging widely in chain length and polarity, were evaluated against both larvae and eggs, Relative larvicidal activities correlated roughly with ovicidal activities, The least larvicidal of these amines, 6-amino-l-hexanol, used at 0,6% in water with 0.1 % decyl alcohol and 6% urea, provided a good ovicide, Of all the ovicides tested, it is presumably the least hazardous to higher organisms.

Document Type: Research Article

Publication date: February 1, 1972

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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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