The markings on the abdomen are similar to the markings found on yellow jackets. The European hornet, Vespa crabro germana, is in the order Hymenoptera and family Vespidae. Life History Damage is most extensive in late summer and early fall when large colonies have developed. The hornets build their nests in protected areas such as hollow trees, hollow posts, partitions in sheds, barns, porches, and attics. Mature nests generally consist of 6- 8 horizontal combs, without the papery covering associated with many other hornets' nests.
Nests are annual and die out in winter.
These hornets have a large stinger and large poison sac and the sting can be painful, but they do not appear to be particularly aggressive or vicious. There is no known insecticidal control for use on host plants. Attempt to locate the nest by following the hornet in its flight to and from the nest. Wear protective clothing and destroy the nest at night by placing an insecticidal dust into the nest entrance, although even at night it is still possible to get stung. European hornets fly at night and are attracted to lights and windows.