Title

Horn fly (Diptera: Muscidae) resistance to organophosphate insecticides

Document Type

Article

Publication Date

4-2-2001

Abstract

Insecticidal ear tags impregnated with organophosphate (OP) insecticides were used each year from 1989 to 1998 at Rosepine, LA. Weekly fly counts were conducted to evaluate control efficacy of the treatments, and bioassays were conducted at least twice per year to measure fly susceptibility to OP and pyrethroid insecticides. Between 1989 and 1992, the efficacy of 20% diazinon-impregnated ear tags was reduced from >20 to just 1 week of control. A high risk of control failure was observed when a resistance frequency of approximately 5% was measured in pre-season bioassays. Resistance to diazinon, fenthion, ethion, pirimiphosmethyl, and tetrachlorvinphos was observed. Esterase activity toward α-naphthyl acetate was significantly higher in flies collected at Rosepine in 1997 than in flies from a laboratory colony and from a susceptible field population. © 2001 Elsevier Science B.V.

Publication Source (Journal or Book title)

Veterinary Parasitology

First Page

243

Last Page

256

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