Asian long-horned beetle

The Asian long-horned beetle poses a serious threat to Canada’s forests and trees.

Canadian Food Inspection Agency

Learn more about the ALB

ALB in its adult form is a has a black body, blue-white bands on long antennae (the “horns”), blue leg bands, and a starry sky pattern of white spots of various sizes on its wing casings. In its larval (instar) stages it exists as a large grub that, 2 weeks after been laid as an egg on the surface of the host hardwood tree, enters through the bark to consume the relatively nutrient-rich tissues underneath, slowly girdling the tree’s life support system beneath the bark. After a period of 1-2 years, the larva pupates and emerges from the tree as an adult beetle by chewing a relatively large (typically 10 millimetres diameter) perfectly round exit hole.

The ALB disrupts the tree’s life support system, which results in a rapid decline with crown and branch death within three or four years, and mortality of the tree within 15 years of initial infestation. During this time some trees may become hazardous. Infested trees do not recover.

Tree species in Canada susceptible to ALB

High risk, preferred host species

Maple - Acer spp. Willow - Salix spp. Elm - Ulmus spp. Buckeye, horse chestnut - Aesculus spp. Sycamore, London plane - Platanus spp. Birch - Betula spp. Ash - Fraxinus spp. Mountain ash - Sorbus spp. Poplar, cottonwood - Populus spp. Katsura - Cercidyphyllum spp. Golden rain tree - Koelreuteria sp.

Control of ALB is overseen by the CFIA. Control and eradication is achieved by destroying all infested and high-risk species of trees within a defined control zone, usually 400m radius from a confirmed host tree. The CFIA and municipalities work together to remove all trees of the species that can be hosts to ALB, whether the trees are infested or not, on private and public lands. Monitoring continues for several years, until the CFIA is satisfied the pest has been eradicated.

Emerald Ash Borer

The Emerald Ash Borer (EAB) is a metallic green wood-boring beetle of about 1 to 1.5 cm in length that attacks all native species of ash trees, typically killing them in two to three years. Its larva bore tunnels inside the tree, feeding off the inner bark until the tree dies.

EAB poses a significant risk to about 700,000 trees in our City. Use the EAB Identification Guide to identify EAB and Ash trees and trees that may be infected by EAB.

The Canadian Food Inspection Agency (CFIA) has issued a “Ministerial Order” on all of Middlesex County, including the City of London, to help slow the spread of the EAB.  Property owners and residents in Quarantine Zones face strict restrictions on the movement of ash and firewood.

Ash materials and firewood cannot be taken out of the Quarantine areas. Instead, you can bring any ash materials and firewood to the three yard waste processing depots (Oxford St. West EnviroDepot , Clarke Road EnviroDepot and the Depot located at Try Recycling on Clarke Rd). Ash materials will also be picked up if properly package during the curbside collection of yard waste.


Last modified:Thursday, September 17, 2020