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The effect of three organo‐phosphorus insecticides on certain arthropods which infest livestock
Author(s) -
BEESLEY W. N.
Publication year - 1963
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1963.tb03751.x
Subject(s) - biology , phosphorus , livestock , toxicology , agronomy , ecology , metallurgy , materials science
SUMMARY The organo‐phosphorus compounds fenchlorphos, trichlorphon and coumaphos, used at 0·25%, killed Dermanyssus gallinne on poultry and perches, and Leiognathus (Liponyssus) sylziarum on poultry: both showed persistent acaricidal value without avian toxicity. Fenchlorphos at 100 mg./kg. and trichlorphon at 20–100 mg./kg. were systemically effective against larvae of Lucilia sericata on sheep. Coumaphos was non‐insecticidal, but toxic to sheep, when given orally at 15–20 mg./kg. Sprzying with 0·25% coumaphos protected sheep against L. sericata larvae for 8–10 weeks. Fenchlorphos administered orally at 110 nig./kg. killed larvae of Hypoderma boris which had been implanted into calves. Trichlorphon (2·0%) applied externally killed all larvae within 28 days: coumaphos (2·0%) similarly applied was larvicidal within about 15 days. The toxic dose of fenchlorphos for calves was 500 mg./kg.; trichlorphon at 300 mg./ kg. and coumaphos at 20 mg./kg. were toxic to sheep.