Development and Evaluation of a Rapid Bioassay for Monitoring Propargite Resistance in Tetranychus Species (Acari: Tetranychidae) on Cotton

Authors: GRAFTON-CARDWELL, ELIZABETH E.; GRANETT, JEFFREY; LEIGH, THOMAS F.; NORMINGTON, SHERIT A M.

Source: Journal of Economic Entomology, Volume 82, Number 3, June 1989 , pp. 706-715(10)

Publisher: Entomological Society of America

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Abstract:

Cotton test plots treated with the selective acaricides propargite, avermectin B1 or left untreated showed that a Tetranychus urticae Koch population can cause loss of efficacy of propargite. In contrast, test plots infested with mixed species and resistance levels of Tetranychus species were maintained closer to economic thresholds by propargite. A rapid bioassay for detection of T. urticae and T. pacificus McGregor populations resistant to propargite was developed. Comparison of the rapid with the standard leaf bioassay method using discriminating concentrations of 1,000 and 3,162 ppm resulted in the same prediction of significant levels or frequencies of propargite resistance in 86.7 and 88.7% of the replications tested. A threshold of <70% mortality with a discriminating concentration of 1,000 ppm propargite was chosen for the rapid test to identify spider mite populations that are most likely to cause field efficacy problems. The rapid propargite bioassay was used in combination with sampling of cotton leaves to show that it can be used commercially to evaluate the severity of propargite resistance in individual fields.

Document Type: Research Article

Publication date: June 1, 1989

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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