Interaction of Mulch and Bacillus thuringiensis subsp. tenebrionis on Colorado Potato Beetle (Coleoptera: Chrysolllelidae) Populations and Damage in Potato

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The use of straw mulch and no-mulch, a synthetic pyrethroid (esfenvalerate, Asana XL) and a bioinsecticide, Bacillus thuringiensis subsp. tenebrionis, were compared for their main and interactive effects on Colorado potato beetle, Leptinotarsa decemlineata (Say), populations in potato, Solanum tuberosum L. Numbers of Colorado potato beetle adults and egg masses were not significantly different in mulch versus no-mulch plots. There were fewer adults and egg masses in Asana-treated plots than in plots treated with B. thuringiensis (Mtrak) or the control (untreated). Significantly fewer small (1st and 2nd instars) and large (3rd and 4th instars) larvae were recorded in mulch treatments than in no-mulch treatments, and significantly fewer small and large larvae in Asana-treated plots compared with M-trak or untreated plots. However, the M-trak plots had significantly fewer large larvae than the untreated plots. Defoliation levels were significantly greater in no-mulch plots than mulch plots. Defoliation levels were significantly lower in Asana plots compared with M-trak or untreated plots. There was a significant interaction between mulch plus M-trak. This combination had numbers of large larvae, defoliation levels and yields as low as the Asana treatment. M-trak had its greatest effect on 1st instars and neonates, and did not affect natural enemies.

Document Type: Research Article

Publication date: April 1, 1996

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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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