Asian Long-horned Beetle

(Anoplophora glabripennis)

Physical Description

Do you have an unwanted pest you want to identify? It could be the invasive species,the Asian Longhorned Beetle!

-has a glossy black body  with 0 to 20 irregular white spots on the back

-bullet shapped

-1.7 to 3.5 centimetres, females being larger than males

-legs( 6 in total)have a blueish tint, same size as body


  • long (1 to 1.3 times the body length in females, 2.5 times the body length in males)
  • 11 black segments separated by blueish tint


The Asian Longhorned Beetles reproduction starts in the summer months an it takes 10-15 days for the larvae to hatch. The fertile female beetle then finds a tall softwood tree and chews on the bark making 35-90 individual depressions. These depression will house the eggs for the duration of the hatching process.

The larvae are straight, with their front ends broader than the rest of the body. This characteristic is important because the larvae use fleshy pads on there segments as appose to legs to navigate the tunnels. They do this by pressing the pads against the tunnel walls as a means of balance while there bodies expand or contract (kind of how a Caterpillar moves). the larvae then continue to eat through the bark and eventually into the "heart" of the tree. This progresses for several months, untill they mature into pupae. The total process from egg to pupation takes some 10–22 months, depending on the elements, climate, and season.


After the total growth of the Beetle they emerge as early as May and as late as October or November, depending on climate. They then start to migrate to other trees once the host tree can't supply enough nutrients and the number of adults is too dense.  Larvae are the most dangerous because they tunnel deep into the wood as appose to eating the bark. After a tree has been occupied by generations of the beetles, larval feeding can disrupt the tree's tissues, speeding up fungal growth, and cause structural weakness, which will kill the tree. Adult Asian long-horned beetles are considered to be of minor importance since they feed on twigs, foliage and occasionally on fruit-bearing trees. Asian long-horned beetle devours both healthy and physically stressed trees.

The Asian long-horned beetle is now one of the most destructive invasive insects in the United States; it and other wood-boring pests cause an estimated $3.5 billion in damage annually, both to the trees and the logging businesses.  

A tree that has been infected from the Asian Longhorned Beetle. The small tunnels you see are the damage from a larvae.

Arrival to North America

The Asian Longhorn Beetle was first discovered in Canada on September 18,2003 in Toronto, and estimate it arrives about a year prior to its discovery. They were first seen on the city limits of Vaughan and Toronto, Ontario and had already infected a quarter of the forest. Its is believed that the pest arrived into North America by solid wood crates and pallets that were made from infested trees of the beetles native country. (China and the Korean Peninsula)

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