Yellow Jacket (Wasp)

Description:

The subfamily Vespinae contains the largest and best-known eusocial wasps, including true hornets (the genus Vespa), and the "yellowjackets" (genera Dolichovespula and Vespula). The remaining genus, Provespa is a small, poorly-known group of nocturnal wasps from Southeast Asia. One genus, Palaeovespa, has been described from the Eocene fossil record, from Colorado. Collectively, the group can be found on all continents except Antarctica, and several of these wasps are invasive species, introduced beyond their native range, and can be major pests.

Habitat:

Dolichovespula species (for example, the aerial yellowjacket, Dolichovespula arenaria, and the bald-faced hornet, Dolichovespula maculata) tend to create exposed aerial nests (a feature shared with true hornets, which has led to some confusion as to the use of the name "hornet"). Vespula species, in contrast, build concealed nests, usually underground. Yellowjacket nests usually last for only one season, dying off in winter. The nest is started by a single queen, called the "foundress". Typically, a nest can reach the size of a basketball by the end of a season. In parts of Australia, New Zealand, the Pacific Islands, and southwestern coastal areas of the United States, the winters are mild enough to allow nest overwintering. Nests that survive multiple seasons become massive and often possess multiple egg-laying queens.[3][4]

Notes:

In 1975, the German yellowjacket first appeared in Ohio, and has now become the dominant species over the eastern yellowjacket. It is bold and aggressive, and if provoked, it can sting repeatedly and painfully. It will mark aggressors, and will pursue them if provoked. The German yellowjacket builds its nests in cavities (not necessarily underground) with the peak worker population in temperate areas between 1,000 and 3,000 individuals between May to August, each colony producing several thousand new reproductives after this point, through November. The eastern yellowjacket builds its nests underground, also with the peak worker population between 1,000 and 3,000 individuals similar to the German yellowjacket. Nests are built entirely of wood fiber (usually weathered or dead) and are completely enclosed (football or soccer-ball shaped) except for a small opening (entrance) at the bottom. The color of the paper is highly dependent on the source of the wood fibers used. The nests contain multiple, horizontal tiers of combs (10 or more) within. Larvae hang down in combs.[citation needed] In the southeastern United States, where southern yellowjacket (Vespula squamosa) nests may persist through the winter, colony sizes of this species may reach 100,000 adult wasps.[citation needed] The same kind of nest expansion has occurred in Hawaii with the invasive western yellowjacket Vespula pensylvanica.[5]