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Soybeans
Volume 63 Number 1 Date 05/03/2018 SOYBEAN APHID - Overwintered eggs on buckthorn have likely begun hatching with this week's warm weather and precipitation. After two to three generations on buckthorn, winged females are produced that disperse to soybean fields. Aphids customarily begin colonizing emerging soybeans by the first or second week of June. Although aphid populations declined to a 17-year low last season, there is the potential for the pest to reach or exceed economic levels every year. BROWN MARMORATED STINK BUG - Crop advisors and soybeans growers are asked to remain alert for BMSB in 2018 and send any suspects to the UW Insect Diagnostic Lab for identification. Reproducing populations are now well-established in portions of southern and eastern Wisconsin and crop damage is expected as this invasive pest becomes more abundant and widely distributed in the state. Soybeans and corn are both at high risk of stink bug injury. Feeding by BMSB on soybean pods and seeds results in 'stay green' symptoms, or soybeans that do not produce harvestable yields. -- Krista Hamilton, DATCP Entomologist 
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