Consumption of Insect Pests by the Evening Bat (Nycticeius humeralis) in Southeastern Michigan

Diet of a colony of evening bats (Nycticeius humeralis Rafinesque) in Lenawee County, Michigan, was studied during 2006–2007, using standard fecal analysis. Of the 594 fecal pellets examined, the spotted cucumber beetle (Diabrotica undecimpunctata howardi Barber: Coleoptera), green stink bug (Chinavia hilaris Say: Hemiptera), and emerald ash borer (Agrilus planipennis Fairmaire: Coleoptera) were identified and occurred at a frequency of 15, 12, and 0.8%; respectively, over the two years combined. In some weeks, up to 64% of the pellets analyzed contained fragments of spotted cucumber beetles, and up to 43% contained green stink bugs—two of the most injurious pests to corn and soybean. Consumption of spotted cucumber beetle and green stink bug appeared to coincide with the life history of these species. Conservation and management of suitable bat habitat adjacent to agricultural lands would likely benefit farmers and bats alike.