Populations of Diabrotica virgifera virgifera LeConte (WCR) and D. barberi Smith and Lawrence (NCR) were monitored in plots (15 by 15 m) that contained 5 x 5 grids of toxic baits in vial traps. For plots in which baits consisted of only olive oil plus carbaryl, 0.4 WCR and 3.6 NCR per bait were captured. In plots in which a feeding stimulant (cucurbitacin) was added, capture per bait was 12.4 WCR and 22.3 NCR. Addition of plant derived volatile attractants (estragole for WCR and eugenol for NCR) increased capture of the respective species another four times. The racemate of 8R-methyl-2R-decyl propanoate (the apparent sex pheromone of both species) caused an increase in numbers of male WCR captured on unbaited sticky traps within plots, but the amount used (900 µ;g per bait) was apparently too great for optimal attraction of males to point sources. The racemate also repelled NCR of both sexes. Over 6 d, traps that were baited with estragole and eugenol removed more WCR and NCR than were estimated to have been in the plots at the start of the test; because of immigration, however, there were no detectable reductions in numbers of beetles on plants within those plots. Feeding stimulants and plant volatiles show great promise for enhancing the effectiveness of adulticides, but, because of the beetles' vagility, the concept must be tested over much broader acreages.
Document Type: Research Article
Publication date: October 1, 1988
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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.