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Impact of Intraplot Mixtures of Toxic and Nontoxic Plants on Population Dynamics of Diamondback Moth (Lepidoptera: Plutellidae) and Its Natural Enemies

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Abstract:

Studies were conducted in 1993 and 1994 to investigate the effects of intraplot mixtures of toxic (with Bacillus thuringiensis Berliner) and nontoxic plants on population dynamics of diamondback moth, Plutella xylostella (L.), and its natural enemies. In 1993, diamondback moth densities in all plots (mixed and nonmixed) declined after generation 2, apparently because of poor plant quality. In 1994, mixed plots with 83.3% toxic and 16.7% nontoxic plants caused diamondback moth densities on nontoxic plants to decline after 2 generations, whereas population densities in plots of 100% nontoxic plants continued to rise. Diamondback moth, Plutella xylostella (L.), dynamics in plots with 50% toxic plants were intermediate compared with dynamics in the other treatment plots. Percentage of parasitism by the parasitoid Diadegmo insulare Cresson was not significantly different between mixed and nonmixed plots. Incidence of the 4 most abundant diamondback moth predators was not different in mixed and nonmixed plots, nor was there a difference in numbers of predators on toxic versus nontoxic plants. These data suggest that intrafield mixtures could serve to decrease density of a target pest such as the diamondback moth, while not adversely affecting natural enemies.

Document Type: Research Article

Publication date: April 1, 1997

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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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