Recommendations for control of insects in soybeans in Michigan are published annually in the MSU bulletin E-1582 Insect, Nematode, and Disease Control in Michigan Field Crops. This bulletin not only lists insecticide recommendations and rates, but provides a summary of biology, sampling methods, threshold, and IPM practices for each insect. Click on the link below to access the individual chapter for soybeans.
E1582 chapter for soybean insect pests
Brown Marmorated Stink Bug
The Brown Marmorated Stink Bug was discovered in the eastern U.S. ten years ago, and it has now reached Michigan. Like many recent invaders, BMSB is a native to Asia, and likely hitchhiked to North America in shipping containers. BMSB has numerous host plants, and thus may become a pest in many Michigan crops. Within a few years, BMSB numbers could increase and become a problem in field crops. In soybean, BMSB feeds through the developing pod, resulting in aborted or shrunken seeds. Field crops may also build large numbers of BMSB that then move into fruits and vegetables later in the season. In addition, BMSB is a fall home invader and a nuisance for home and business owners.
For information on BMSB ID and damage, see the bulletin BMSB Moves Into the Midwest
Below: BMSB's have white markings on the antennae and white triangles down the abdomen. The front margins of the pronotum (the 'shoulders') are smooth, not toothed.
The garden fleahopper is a tiny insect that resembles a flea beetle. It is small, black and has fat back legs modified for jumping (see picture below). However, garden fleahopper is a true bug, related to other sucking pests such as tarnished plant bug, alfalfa plant bug, leafhoppers, and aphids. Like other true bugs, fleahoppers suck plant juices, damaging individual plant cells and creating yellow feeding spots (stippling - see picture below) that resembles spider mite damage. Garden fleahopper is rarely present in large numbers, although it can build up in alfalfa, then move to a neighboring soybean field when the alfalfa is cut.
For more about fleahopper, see my one-page handout "Garden Fleahopper on Soybeans".