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Symmetrieally disubstituted fatty diamines were synthesized by the reaction of alkyl bromides, H3C-(CH2)7-11-Br, with alkylenediamines, H2N-(CH2)2-6-NH2 or 1,3-diamino-2-propanol. Various formulations of these compounds and commercial compounds were tested against 4th-stage larvae of mosquitoes. In each series of homologues tested activity generally reached a peak with the N,N'- didecyl homologue and diminished as the alkyl chains were lengthened or shortened. The 48-hr LD50 values for A nopheles albimanus Weidemann, Culex pipiens quinquefasciatus Say,and Aedes aegypti (L.) were 0.1, 0.14, and 0.31 ppm when 1.9, 2.5, and 5.6 µl. respectively, of Richfield Larvicide oil containing 5.5% N.N'-didecylputrescine and 4% oleic acid were applied to the o.5ft2 surface of 1 liter of water containing larvae, The oil plus oleic acid control gave LD50 values of 34, 26, and 34 µl, respectively. The dialkyldiamines showed high activity when dispersed in water by a procedure involving heating and shaking to provide, on cooling, floating needles or fibers of minute size. Against A. albimanus and C. p. quinquejasciatus, , best results were obtained with a dispersion of N, N'- didecylputreseine which gave 48-hr LC50 values of 0.041 and 0.014 ppm, respectively, 22 and 35 times that given by Abate® O, O'-(thiodi-p-phenylene) O,O,O',O'-tetramethyl phosphorothioate dispersed in water. Against A. aegypti N, N'-dinonylpropylenediamine was most effective and gave an LC50 of 0.05 ppm, 28 times that given by Abate.
Document Type: Research Article
Publication date: June 1, 1973
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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.