Comparative Studies on Four Strains of Typhlodromus occidentalis.1 III. Evaluations of Releases of Insecticide Resistant Strains into an Apple Orchard Ecosystem2

Authors: CROFT, B. A.; BARNES, M. M.

Source: Journal of Economic Entomology, Volume 64, Number 4, August 1971 , pp. 845-850(6)

Publisher: Entomological Society of America

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Abstract:

Insecticide-resistant strains of Typhlodromus occidentalis Nesbitt from Washington and Utah and a native susceptible strain which failed to persist in sprayed orchards were released into a sprayed orchard ecosystem at Oak Glen. neal Yucaipa. California. Density and distributional parameters were followed throughout a summer and evaluations were made on the ability of these strains to withstand chemical treatments, adapt to the local cndronl11ent. and control populations of Tetranychus mcdanieli McGregor at low densities under the conditions specified. Resistant predators from Wash- Intone and Utah numerically increased. persisted ill the sprayed orchards. ami demonstrated an enhanced ability to control populations of the pest species at lower levels when compared to the native susceptible strain. which only numerically responded to the host after insecticide residues had dissipated. Distributional data evidenced the respective numerical increases of each strain in time and confirmed the ability of T. occidentalis as an efficient predator. Trees on which the resistant strains were released (6 replicates/released strain) required no acaricidal treatments. The potential role of a resistant natural enemy was suggested and the prospect of long. term establishment of resistant mites was favorable from evaluations of the 1st year.

Document Type: Research Article

Publication date: August 1, 1971

More about this publication?
  • 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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