Brown Marmorated Stink Bug

BMSB

Halyomorpha halys

Brown marmorated stink bug (BMSB) adults
Brown marmorated stink bug (BMSB) adults. Photo courtesy of Gary Bernon, USDA APHIS. Licensed under CC BY 3.0.
The brown marmorated stink bug (BMSB) is native to Asia but was recently introduced to the east coast of the United States. As a foreign species with few native predators it has steadily spread across the United States and is a significant agricultural pest of fruit, vegetable, and grain crops.
Like all true bugs, the brown marmorated stink bug (BMSB) has a distinct shield-shaped body and is 1/2-3/4" in length. It can be distinguished from other similar bugs by the alternating light and dark bands on its antennae.
Brown marmorated stink bug (BMSB) female on a bean leaf
Brown marmorated stink bug (BMSB) female on a bean leaf. Photo courtesy of Yerpo. Licensed under CC BY-SA 3.0.
Brown marmorated stink bugs feed directly on fruit and vegetables resulting in marring that destroys their fresh market value. In grain crops such as corn and soybeans, they feed on the kernels and pods causing direct yield losses.
Insecticides are available for controlling brown marmorated stink bugs (BMSB). In high value crops, traps should be used to monitor the presence and severity of BMSB before treating. In grain crops, BMSB tend to stay on the edges of the field, so treatment of just the edges may be sufficient to protect the crop. Always read and follow all label instructions.