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Soybeans
Volume 65 Number 1 Date 04/30/2020 BROWN MARMORATED STINK BUG - Crop advisors and soybean growers are reminded to be alert for this invasive pest this season and send a photo of any suspects to the UW Insect Diagnostic Lab for official confirmation. Brown marmorated stink bug (BMSB) is now firmly established throughout the southern half of the state, and its range has also expanded into western Wisconsin in the last 2-3 years. Soybeans and corn are both at high risk of infestation and crop damage is anticipated in 2020. In addition, the milder-than-average winter of 2019-2020 could contribute to higher BMSB populations this summer. A map showing confirmed BMSB county records since the first Wisconsin detection 10 years ago is provided below. SOYBEAN APHID - Overwintered eggs on buckthorn have begun hatching with the warmer weather of late April. After 2-3 generations on buckthorn, winged females are produced that will disperse to soybean fields in early June. Although DATCP surveys last season found the lowest aphid populations in 18 years, there is the potential for the pest to reach or exceed economic levels every year. As is the case with BMSB, mild winter temperatures are likely to have favored survival of soybean aphid eggs on buckthorn and may lead to higher aphid pressure on the 2020 soybean crop. -- Krista Hamilton, DATCP Entomologist 
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