In The United States
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 yellow jacket 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 yellow jacket builds its nests underground, also with the peak worker population between 1,000 and 3,000 individuals similar to the German yellow jacket. 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.
In the southeastern United States, where southern yellow jacket (Vespula squamosa) nests may persist through the winter, colony sizes of this species may reach 100,000 adult wasps. The same kind of nest expansion has occurred in Hawaii with the invasive western yellow jacket Vespula pensylvanica.
Read more about this topic: Yellow Jacket
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