Within most of the natural temperate range, nests decline annually in the winter and must be founded anew each spring by a solo, overwintered, mated queen (Akre et al., 1980). This species can be a nuisance even within its native range, with periodic outbreaks associated with warm, dry springs, every 3 to 5 years (Miller, 1961). CABI is a registered EU trademark. Scientific Name: Vespula pensylvanica Category: Bee, Ant, Wasp and Similar Size (Adult; Length): 8mm to 15mm (0.31in to 0.59in) Gambino and Loope (1992) estimated one multi-year, polygynous nest on Haleakala (Maui) as containing more than half a million cells. Chemical attractants for trapping yellowjackets Vespula germanica and Vespula pensylvanica (Hymenoptera: Vespidae). Wallingford, UK: CABI. Descriptions of new Hymenoptera. In: U.S. Further details may be available for individual references in the Distribution Table Details section which can be selected by going to Generate Report. 2014f, US Fish and Wildlife Service, U.S. Note: insect is using hind leg to clean wing. Fish and Wildlife Service species assessment and listing priority assignment form: Hylaeus mana : US Fish and Wildlife Service.30 pp. Research on the ecosystem effects of V. pensylvanica, in both native and introduced ranges, is limited. The distribution in this summary table is based on all the information available. yellow head bumble bee . Journal of the Entomological Society of British Columbia, 102:35-41, Landolt PJ, Reed HC, Ellis DJ, 2003. only in size, those of Mischocyttarus averaging somewhat smaller. V. pensylvanica is naturally widespread in the western states of the United States, with extensions into southern British Columbia and Alberta, and scattered occurrences in the mountains of northwestern Mexico. Matayoshi S, 1981. This species, commonly known as the ‘western yellowjacket’, was originally described as Vespa pennsylvanica by Saussure in 1857. Biological Sciences, 8(1), Gambino P, 1991. Environmental Entomology, 27(5):1229-1234, Landolt PJ, Pantoja A, Green D, 2005. before fertile queens disperse in the fall season. Behaviourally, V. pensylvanica can adhere in flight to people or sources of food with persistent, hovering flight, and are very aggressive defenders of underground nests when disturbed by vibrations or activity near entrances. Field test of the nematode Steinernema feltiae (Nematoda: Steinernematidae) against yellowjacket colonies (Hym. Updated: 1/14/2020; Akre RD, 1991. Matz, http://bugguide.net/user/view/1285 80x5 - 240x3 - 240x4 - 320x1 - 320x2 - 320x3 - 640x1 - 640x2 Set display option above. In insect groups with the ability of endothermy, the thermoregulatory capacity has a direct relation to body mass. Vespula germanica (F.) (German yellowjacket) workers were also captured in signifi- In the Hawaiian Islands, the wasp has invaded several National Parks (Hawaii Volcanoes National Park, Haleakala National Park) and many other preserved areas (e.g., Hakalau National Wildlife Refuge). 73-102. Vespula pensylvanica. New Zealand Journal of Zoology, 18(2):223-227, Akre RD, Greene A, MacDonald JF, Landolt P, Davis HG, 1980. Containment will also be difficult considering the strong flight capabilities of queens and the wide range of habitats in which they can nest. The queen in V. pensylvanica and Vespula vulgaris probably deposits a pheromone on the comb that inhibits worker ovarian development, even if no pheromonal-mediated behavioral response to queens has been demonstrated (Akre and Reed, 1983). Wasp research: strengths, weaknesses, and future directions. western yellowjacket . Journal of the Kansas Entomological Society, 48(1):53-63, Matayoshi S, 1981. Queens are the only propagules that can found new populations. Annals of the Entomological Society of America, 71(3):299-312, Landolt PJ, 1998. Workers are contaminated when they return to the nest and carry the powder inside. It is well known that these wasps prey on native arthropods in the Hawaiian Islands, but wider effects are unknown. It reached southern California in 1991 becoming part of our fauna. Authors have attributed positive pest control functions to this species in its native range. CABI Compendium: Status inferred from regional distribution. Fish and Wildlife Service). Different species of yellowjackets can be distinguished using keys in Jacobson et al. However, a cluster of new island records was variously reported from 1978 (Matayoshi, 1981; Miyahara, 1981; Nakahara,1980; Gambino et al., 1990), possibly as a result of a second introduction of a more aggressive race with shipped Christmas trees. Powders are applied using mechanical dusters which may be equipped with extension tubes, a spoon (which can be attached to a cane), or a puff-pack. Fish and Wildlife Service species assessment and listing priority assignment form: Hylaeus kuakea : US Fish and Wildlife Service.29 pp. Bulletin of the Brooklyn Entomological Society, 25:59-70, Bequaert J, 1931. Fish and Wildlife Service species assessment and listing priority assignment form: Hylaeus assimulans : US Fish and Wildlife Service.33 pp. The Vespula or yellow-jacket nests may contain as many as 15,000 individuals, composed of males, females, and workers in most species. Single queens that overwinter in the foliage can found new colonies in their non-native range. Discover Life's page about the biology, natural history, ecology, identification and distribution of Vespula pensylvanica, distribution image Fish and Wildlife Service species assessment and listing priority assignment form: Hylaeus facilis : US Fish and Wildlife Service.32 pp. Vespula pensylvanica (Saussure) (western yellowjacket) and V. atro-pilosa (Sladen) trapped with heptyl butyrate in Washington increased with greater release of the attractant from vial dispensers, up to an estimated 2.3 milligrams heptyl butyrate per hour. Nests can also be destroyed through several techniques involving pesticides. AGR PUB 809-846 (N/4/20) 768x512.