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Mosquito larvae were used for the determination of toxicities of stomacl1 poisons. With the formula K = 1/t log 1/conc the following.values of K, a constant concstant for the expression of toxicity, were obtained against Culex quinquefasciatus: Sodium fluosilicate 32.1,sodium arsenite 9.6, sodium arsenate 3.5,and sodium fluoride 3.On grass-hoppers, sodium fluosilicate used at the rate of 1-56 in poison bran baits showed 100 per cent mortality within 48 hours,whereas sodium arsenite gave 89 per cent. With the cutworm,Feltia ducens,sodium arsenite gave a kill of only 57 per cent within 72 hours,while sodium fluosilicate showed. a mortality of 88 per cent. Against mammals the arsenates are nine times more toxic than sodium fluosilicate and thirty times more toxic than sodium fluoride.Since there is evidence that minute amounts of arsenic,ingested daily for prolonged periods of time,may interfere with health,it is advocated that the subject is of such importance as to warrant investigation by a "Referee Board."
Document Type: Research Article
Publication date: February 1, 1928
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.