Polymerization as a Means of Prolonging Effectiveness of Orally Administered Systemic Insecticides1

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Three systemically active insecticides, dimethoate, Dipterex® (O,O-dimethyl 2,2,2-trichloro-1-hydroxyethyl phosphonate), and Bayer 37342 (O,O-dimethyl O-(3,5-dimethyl-4-methylthiophenyl) were incorporated into resins prepared from glycerol, gelatin, 40% formalin, and urea, combined at ratios of 5: 5: 5 :4, respectively. The technical materials and resins were administered o1'lllly to Angora goats; systemic activity was determined by the mortality of screw-worms (Callitroga himinivorax (Coquerel) implanted in wounds on the goats, and of stable flies (Stomoxys calcitran0s (L.)) fed on the goats.

Resins containing 25% Dipterex showed little or no apparent increase in duration of effectiveness over technical Dipterex.

With dimethoate, resins containing 25% active ingredient afforded longer systemic activity than the technical material at dosages of 50, 75, and 100 mg./kg., but not at 25 mg./kg. Although variation among individual animals occurred, at 50 mg./kg., on the average, resins containing 50% active ingredient reduced the duration of effectiveness below that of the technical material, but resins containing 25% and 10% active ingredient increased the duration by factors of approximately 11/2and 2, respectively.

With Bayer 3734'l, there was again variation among individual animals, but at 100 mg./kg., on the average, resins containing 25% and 10% active ingredient increased the duration of effectiveness over that of the technical material by factors of approximately 1½ and 1¾,spectively.

Document Type: Research Article

Publication date: February 1, 1962

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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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