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asian long horned beetle

Asian Longhorned Beetle

The Asian Longhorned beetle is an invasive, wood boring insect from China which was accidentally introduced to the U.S. via packing materials. ALB is a member of the Cerambycid family. The adults are large, black beetles, approximately 1 - 1 1/2 inches long with irregular white spotting on their wing covers and very long, black and white striped antennae. Onthe male, the length of the antennae can be up to twice the length of their body. The larva is cream colored, grub-like, approximately 1-2 inches long when mature. This horned beetle has been identified in NY, NJ, IL, MA, and recently OH.

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Symptoms of ALB infestation are similar to symptoms of many pest infestations, including yellowing leaves, and dieback of branches. Specific signs include bleeding wounds in the trunk or large limb bark, indicating oviposition of eggs. There may also be large (3/8 inch) sized, perfectly circular holes in the trunk or large limbs and frass (sawdust) on the ground near the holes. The beetles themselves may also be visible during mid to late summer months, feeding in the canopy.

Photo A taken by Kenneth R. Law, USDA APHIS PPQ,
Photo B taken by Thomas B. Denholm, New Jersey Department of Agriculture,
Photo C taken by Steven Katovich, USDA Forest Service,
Photo D taken by Dennis Haugen, USDA Forest Service,

Because the Asian Longhorned Beetle bores into the sapwood of the tree, it can be most effectively controlled with systemically applied insect control products. Currently, IMA-jet is labeled for use against Asian Longhorned Beetle under USDA supervision only. For insect control, this product must be placed into the tree's sapwood, the conductive tissue that moves water to the canopy. Make applications around the base of the tree. Inject into tree roots exposing them by careful excavation or, alternatively into the trunk flare or tissue immediately above the trunk flare, locating the injection site in the first few xylem (i.e., sapwood) elements. Drill holes through the bark and into the sapwood a minimum of 3/8 inches deep. When using the Arborjet Arborplug, drill a minimum of 5/8 inches deep into the sapwood. The dosages and number of application sites are based on tree diameter. To determine the application/dose rate per tree: 1) measure the tree diameter in inches at chest height (54 inches from ground) to find the Diameter at Breast Height (DBH). If measuring tree circumference, divide circumference by 3 to obtain the DBH in inches; 2) calculate the number of injection sites by dividing the DBH in inches by 2; and 3) refer to the label for dose rate of IMA-jet to be applied.


For optimum results, apply IMA-jet prior to infestation. Also apply when insects are infesting and feeding upon the tree. IMA-jet insecticide moves upward into the tree's canopy from the application sites. Systemic activity occurs only after the active ingredient is translocated upward in the tree. This product must be applied below the bark into the sapwood (i.e., the vascular) tissues. In the case of severe infestation, use the highest label rate for the targeted pest. In trees larger than 24 inches use the highest rate listed for that insect pest. The need for an application can be based on historical monitoring of the site, previous records or experiences, current season adult trapping and other methods. Due to potential foliar injury or poor (i.e., slow) uptake, do not apply to trees stressed by drought or extreme heat.

Dosages are designed for insect control and retreatment is generally not necessary during the year after initial treatment. Monitor insect activity to establish a damage threshold for retreatment. Repeat applications as necessary.

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