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Soybeans
Volume 61 Number 1 Date 04/28/2016 BROWN MARMORATED STINK BUG - Based on the high number of reports originating from the Madison area last year, the brown marmorated stink bug (BMSB) is presumed to be established in Dane County, and possibly in parts of southeastern Wisconsin. Although BMSB poses the largest threat to orchard crops, soybeans and other agronomic crops are also at risk as this invasive pest becomes more widely established in the state. Feeding by BMSB on soybeans results in 'stay green' symptoms, or soybeans that do not produce harvestable yields. Research on BMSB in the Mid-Atlantic States has found that most economic damage occurs in the first 50 feet from the edge of a soybean field, and single well-timed field-edge-only treatment can effectively reduce populations. Crop advisors and soybeans growers should be aware of the possibility of BMSB infestation this season and report any suspects to DATCP. SOYBEAN APHID - Emergence of aphids from overwintered eggs on buckthorn began by April 4 and is likely subsiding. The combination of high multicolored Asian ladybeetle populations and low aphid populations last fall suggest aphid densities could be lower this season compared to 2015. The first aphids customarily begin colonizing emerging soybeans by the first week of June. -- Krista Hamilton, DATCP Entomologist 
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