Date: 3/30/99

Time: 2:55

Type: Symposium

Number: 153

Influence of semiochemical-based baits on non-target predatory arthropods in Iowa and South Dakota corn fields

*B.W. Fuller, M.A. Boetel, Dept. of Plant Science, South Dakota State University, Brookings, SD 57007; L.D. Chandler, N. Grain Insects Research Lab., USDA-ARS, Brookings, SD 57006 and J.J. Tollefson, Dept. of Entomology, Iowa State University, Ames, IA 50011
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Investigations into the impact of semiochemical-based adult rootworm management on non-target beneficial arthropods are ongoing in South Dakota and Iowa. This work is being carried out under the auspices of the national Area-wide Adult Rootworm Management Program. Sampling was conducted during 1997 and 1998 by using whole-plant dissections (100/field), sticky traps (12/field) and pitfall collections (12/field). Treatment plots (replicated 4 times) consisted of continuous corn fields under one of the following corn rootworm management regimes: 1) conventional control of larvae using planting-time soil insecticide use and 2) application of SLAM® for adult suppression (to prevent egg laying). Experimental design was somewhat dictated by farming practices in the 16 square-mile area. Grower participation was conditional on fields receiving some form of protection from rootworm injury. Therefore, conventionally treated fields served as controls in our experiment. Classification to family has been accomplished for samples from each state and this preliminary review of our findings will be restricted to that taxonomic level. However, placement of an arthropod into a family classification may be insufficient to justify arbitrary assignment as a beneficial. In light of the early stage of our evaluation of these findings, no statistical responses associated with individual species can be provided in this presentation. Numerical and general population changes will be the primary emphasis of our report.

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