Impact of Fenvalerate and Diflubenzuron on Target and Nontarget Arthropod Species on Bartlett Pears in Northern California
Authors: Riedl, Helmut; Hoying, S. A.
Source: Journal of Economic Entomology, Volume 73, Number 1, February 1980 , pp. 117-122(6)
Publisher: Entomological Society of America
Abstract:The synthetic pyrethroid fenvalerate provided commercial control of the pear psylla, Psylla pyricola Foerster, during the prebloom as well as the foliar period. Two cover sprays at 6.7 and 13.5 g AI/100 liters gave seasonal control. This compound was equally effective against the codling moth, Laspeyresia pomonella (L.), at rates ranging from 3.4 to 13.5 g AI/l00 liters. Even a single well-timed 1st cover spray gave acceptable seasonal protection. All foliar applications of fenvalerate resulted in increased populations of spider mites, primarily the twosponed spider mite, Tetranychus urticae Koch, even though higher dosages were initially somewhat acaricidal. Peak levels of spider mites during the summer were correlated with the amount of foliage present at the time of pyrethroid application. Apparently regulation of spider mites by natural enemies became decreasingly poorer as less pesticide-free leaf surface was available. Fenvalerate at 13.5 g AI/100 liters temporarily suppressed the pear rust mite, Epitrimerus pyri (Nalepa), and did not induce outbreaks of this species. In comparison, diflubenzuron was weaker for codling moth, had no direct effect on pear psylla, but did not induce phytophagous mites.
Document Type: Research Article
Publication date: February 1, 1980
- 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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