|Adult locust borer|
Megacyllene robiniae, commonly known as the locust borer, is a species of longhorn beetle endemic to eastern North America. It is a serious pest to Robinia pseudacacia, the black locust tree, with which it is sympatric.
The specific name, robiniae, is derived from the New Latin name, Robinia, which is the generic name of the black locust tree, Robinia pseudacacia, on which the larvae feed. The name, Robinia, was coined by Linnaeus to honor the royal French gardeners Jean Robin (father) and Vespasien Robin (son).
From a distance Megacyllene robiniae can easily be mistaken for a wasp or bee. Even at a closer look it is often mistaken for M. caryae or M. decora. The adult beetle grows between 12 and 20 mm (0.47 and 0.79 in) and has a W-shaped 3rd stripe on the elytra. The antennae of both sexes are dark brown. The male's antennae are two-thirds its body length, and the female's are one-half. The legs are reddish-brown.
Geographic range and habitat
Its geographic range has grown over the years following the expanding range of R. pseudoacacia. As more and more people use the black locust tree as an ornamental, the range of M. robiniae grows. It can be found almost anywhere unprotected black locust trees grow, and is often more abundant when Solidago, commonly called goldenrod, is also present. The females are often found running up and down black locust trunks in search of wounds in which to lay their eggs. Both sexes are most common from late day to dusk. Because of the adults' primary food, they tend to stay in uncultivated fields and meadows.
Adults lay their eggs in locust trees in the fall. Later the larvae will hatch and spend the winter hibernating within the bark. Once winter ends, the larvae will burrow into the tree trunk and start to tunnel. These tunnels are around 10 cm (4 inches) long by 7 mm (0.25 inch) wide. The larvae will then pupate in late July and early August. The adults will start to emerge in late August and throughout September. The tunnels serve as a primary infection site for wind-borne spores of the fungus Phellinus robiniae, which causes a damaging heart rot disease of Robinia species.
- "Locust Borer Megacyllene robiniae (Forster)". Retrieved 2008-12-18.
- "Species Megacyllene robiniae - Locust Borer - Bugguide.net". Retrieved 2008-12-18.
- "ITIS (Integrated Taxonomic Information System) Standard Report Page: Megacyllene robiniae". Retrieved 2008-12-18.
- Kaufman, Kenn; Eaton, Eric R. (2006). Kaufman Field Guide to Insects of North America. Boston: Houghton Mifflin Books. pp. 180–181. ISBN 978-0-618-15310-7.
- Sinclair, Wayne A.; Lyon, Howard H. (2005). Diseases of Trees and Shrubs, 2nd Edition. Ithaca: Cornell University Press. ISBN 978-0-8014-4371-8.
- Milne, Lorus; Milne, Margery (1980). National Audubon Society Field Guide to North American Insects & Spiders. New York: Alfred A. Knopf, Inc. p. 594. ISBN 0-394-50763-0.
- Evans, Arthur V. (2007). "Beetles, Order Coleoptera". Field Guide to Insects and Spiders of North America. New York: Sterling Publishing Co., Inc. p. 207. ISBN 978-1-4027-4153-1.
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