Evaluation of Dispersible Formulations of Erythrosin B for Field Control of Culex pipiens quinquefasciatus Say (Diptera: Culicidae)

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Eight dispersants were tested in combination with free-acid erythrosin B and fluorescein to determine their toxicity. Solidogen LT-13 and Aquonium C-IV were most effective in combination with erythrosin B. Aquonium C-IV, Emulphor EL-719, Nekal BX-78, and sodium dodecyl sulfate were equally effective in combination with fluorescein. None of the dispersants alone was toxic. Four formulations of erythrosin B (free-acid dispersed with 8% sodium dodecyl sulfate, microencapsulated free-acid, aluminum lake dispersed with 8% sodium dodecyl sulfate, and microencapsulated aluminum lake) were exposed to natural sunlight and environmental conditions for up to 28 days and tested for toxicity to fourth-instar Culex pipiens quinquefasciatus Say. The dispersed free-acid erythrosin B was most toxic of the four formulations tested. The dispersed free-acid was significantly toxic at 0.5 ppm, and all four formulations were toxic at 4.0 ppm. Dispersed and microencapsulated free-acid formulations exhibited residual toxicity up to 7 days. In small-plot field tests, the dispersed free-acid erythrosin B caused significant reductions in larval and adult populations of C. p. quinquefasciatus at concentrations ranging from 0.25 to 8.0 ppm.

Document Type: Research Article

Publication date: February 1, 1985

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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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