Resistance in the Eye Gnat Hippelates collusor to Soil Insecticides1

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Abstract:

Two strains of Hippelates collusor (Townsend) from two different areas in southern California were compared for tolerance to organochlorine and carbamate insecticides. Treated soil was tested against immature stages; dosage response lines and LD50 and LD90 were determined. Resistance level in the Coachella Valley collusor (C.V.C.) strain was determined by comparing its tolerance level with that of the Orange County collusor (O.C.C.) 1,000-fold resistance to dieldrin and heptachlor, respectively. It indicated 190-, 17-, and 15.5-fold tolerance to aldrin, toxaphene, and endrin, respectively. The two strains indicated similar levels of response to DDT treatments, with the C.V.C. strain only slightly more tolerant to DDT than the O.C.C. strain. After 4 years of large-seale control treatments with DDT, tolerance in the C.V.C. strain increased four- to fivefold compared with the strain which was considered to be highly susceptible to some of the organochlorine insecticides.

At LD90 level the C.V.C. strain exhibited 970- and more than pretreatment level.

At the LD90 level, the C.V.C. strain manifested approximately 2-fold tolerance to Sevin® (l-naphthyl N-methylcarbamate) and to Zectran® (4-dimethylamino-3,5-xylylmethylcarbamate). The C.V.C. strain showed 3.8- and 4-fold tolerance to AC-5727 (m-isopropyl phenyl N-methylcarbamate) at the LD50 and LD90 levels, respectively, when compared with the O.C.C. strain.

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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