Know the differenceIt's great to know that so many people are on the lookout for Asian long-horned beetles! Vacationers, especially from the Chicago area, are reporting ?discoveries? of ALB here in Minnesota. Fortunately, these have proven false. What they are finding are our native beetles, the white spotted sawyers. But it's easy to see why there's confusion. They both have ridiculously long antenna and large, black bodies that are flecked with white spots. Here's how to tell them apart: (Psst...... the simplest way is to check out the scutellum.)
|Asian Long-horned Beetle||White Spotted Sawyer|
|Host trees||Hardwoods**; stressed, recently dead and apparently healthy||Conifers; stressed, dying and recently dead.|
|Appearance||Glossy black, very smooth and finely punctate, 20-35 mm long.||Bronzy-black, coarsely and roughly punctate, 15-28 mm long.|
|Both sexes have up to 20 irregularly distinct white spots.||Female- generally mottled with whitish patches. Males- generally completely black.|
|Scutellum (S), triangle
at top of wing covers
|Generally black.||Generally white, although it may be ashy colored.|
|Antennae||Segments 3-11 are distinctly banded white and black in both sexes.
female- 1.3X body length
male - 2.5X body length.
|Female - segments are faintly banded; slightly longer than the body.
Male - segments all black, much longer than the body.
|Legs||Bluish-white, especially on the upper surfaces.||Grayish-black all over.|
** = Maples, boxelder, horsechestnut, black locust, elms, birches, willows, poplars and green ash.
|Asian long-horned Beetle||White spotted sawyer|
The ALB is an exotic wood-boring beetle of hardwood trees that has been
imported into the US in solid wood packing materials from China.
The Secretary of Agriculture has imposed new regulations on such packing
materials from China to better protect our forests. It was initially
discovered in New York City in 1996, although it is believed to have been
here for five to ten years prior to discovery. It was discovered
in Chicago in 1998. Nationally there have been 24 interceptions of
the ALB in warehouses in 14 states. New York City and Chicago are
battling infestations and each city has removed hundreds of trees to eliminate
the pest. Surveys for infested trees continues. Unfortunately,
tree removal and chipping of the wood is the only method, at this time,
that ensures killing the eggs, larvae and pupae.