DECTES STEM BORER CONTROL IN SOYBEANS
Applied Research
Blair Griffin
CEA-STAFF CHAIR
CLARKSVILLE
Abstract
\r\n Dectes stem borer Dectes texanus is a long horned beetle that is considered a minor pest in soybeans Glycine max and other host plants. Dectes overwinters as larvae within the plant stem and adult beetles emerge in late June and early July. Eggs are laid on the plant and after hatching the larvae tunnels in the main stem causing yield loss in heavily infested fields. Studies were conducted over a 3 year period in Johnson County to determine levels of infestation, soybean varietal resistance, and the affect of soil, seed and foliar insecticide treatments. A field survey was conducted in the fall to determine the presence and infestation level of dectes. All of the fields surveyed had some level of infestation. Infestation levels ranged from 55 – 71% of the plants that had larvae tunnels larvae. Variety trials did not reveal any level of resistance by variety. Soil applied and seed treatments have been very effective in controlling soybean insects, but were ineffective in controlling dectes. Foliar insecticide tests based on the emergence of adult beetles were conducted and no statistical differences were noted in the treatments versus the untreated check. All trials were harvested with no significant differences in yield by variety or insecticide treatment. These studies have shown that dectes is found throughout soybean fields in Johnson County and is difficult to control. The larvae tunnels should have a negative impact on plant growth and yields, but it is not enough to causes significant economic yield loss.
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Poster has NOT been presented at any previous NACAA AM/PIC
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Authors: B. Griffin, G.M. Lorenz
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Griffin, B. County Extension Agent, University of Arkansas Cooperative Extension Service, Arkansas, 72830
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Lorenz, G. Extension Speacilist, University of Arkansas Cooperative Extension Service, Arkansas, 72203