The elm seed bug life cycle in Utah is not fully known, but observations indicate that it is similar to the documented life cycle in Italy. Early- and latestage elm seed bug immatures (2d - 2e). 2a - 2e Elm seed bug adults with depiction of key identifying characteristics (2a - 2b). Unlike boxelder bug, however, peak nuisance activity occurs from mid-June through August and elm seed bugs can emit a pungent odor from scent glands, similar to bitter almonds. In Utah, as in other locations, this insect has become a major nuisance pest, entering homes and buildings in great numbers, similar to the boxelder bug. In Utah and Idaho, it has also been observed feeding on elm leaves. and south to Grand Co.Īs a member of the seed bug family (Lygaeidae), this insect feeds primarily on elm seeds, but has also been reported on linden and oak. While Utah’s first submission originated from Salt Lake County, elm seed bug is now widely distributed along the Wasatch Front and Cache Co., and has been reported west to Duchesne Co., east to Tooele Co. It has since been found in Oregon, Washington, British Columbia, Canada and in various locations throughout Asia and Europe. A native of Europe, the elm seed bug was first identified in the U.S. In July 2014, the Utah Plant Pest Diagnostic Lab and USDA APHIS confirmed the first reported occurrence of elm seed bug (Lygaeidae: Arocatus melanocephalus) in the state of Utah (Fig. Residual pyrethroid insecticides applied as perimeter foundation treatments and around window sills, doors and to the undersides of eaves can help reduce elm seed bug entry.Windows and doors must be well-sealed to prevent elm seed bugs from entering tightfitting screens and door sweeps with no gaps are essential.Exclude elm seed bugs by sealing cracks and crevices on structure exteriors.Elm seed bugs emit a pungent odor when crushed or handled, but are not a health threat.Unlike the boxelder bug, elm seed bug activity peaks in mid-summer.Elm seed bug is Utah’s newest nuisance pest.
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