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Asian Long-horned Beetle

Asian Long-horned Beetle

Asian Long-horned Beetle  Home 9 Invaders 9 Category: Forest Pests & Pathogens Background Asian long-horned beetle (ALHB) is an invasive forest pest with no natural enemies in North America that attacks nearly all broadleaf trees, with native...
Emerald Ash Borer

Emerald Ash Borer

Emerald Ash Borer  Home 9 Invaders 9 Category: Forest Pests & Pathogens Background Emerald Ash Borer is a forest pest native to Asia that has killed millions of Ash trees in southwestern Ontario, and the Great Lakes States. Due to its major...
LDD Moth

LDD Moth

LDD Moth  Home 9 Invaders 9 Category: Forest Pests & Pathogens Note: this page is about the invasive moth species Lymantria dispar dispar (LDD), previously referred to as the Gypsy Moth. That name is derived from a culturally offensive slur;...
Invasive Earthworms

Invasive Earthworms

Invasive Earthworms  Home 9 Invaders 9 Category: Forest Pests & Pathogens Background Native earthworms from Canada were removed by the last glaciers and of the 19 species confirmed in Ontario, 17 originate from Europe and 2 from the United...
Mountain Pine Beetle

Mountain Pine Beetle

Mountain Pine Beetle  Home 9 Invaders 9 Category: Forest Pests & Pathogens Background Mountain pine beetle is an insect responsible for creating widespread pine mortality in British Columbia. Native to western North American forests, this small...
Beech Bark Disease

Beech Bark Disease

Beech Bark Disease  Home 9 Invaders 9 Category: Forest Pests & Pathogens Background Beech bark disease is a new threat affecting beech (Fagus grandifolia) trees in Canada’s hardwood and mixed forests. This disease is caused by a combination of an...
Butternut Canker

Butternut Canker

Butternut Canker  Home 9 Invaders 9 Category: Forest Pests & Pathogens ( Page 2 ) Background Butternut canker is a fungus that infects and kills healthy butternut trees (Juglans cinerea) of any size or age. We don’t know where the disease...
Dutch Elm Disease

Dutch Elm Disease

Dutch Elm Disease  Home 9 Category: Invaders ( Page 7 ) Background Dutch elm disease is caused by a fungus (Ophiostoma ulmi) that has been killing native elm trees in North America. The disease is spread by both a native elm bark beetle (Hylurogopinus...
Oak Wilt

Oak Wilt

Oak Wilt  Home 9 Category: Invaders ( Page 7 ) Background Oak wilt is a fungal pathogen (Bretziella fagacearum) killing thousands of oak trees in North American forests and woodlands each year. The fungus is able to spread from infected to healthy trees...
Sudden Oak Death

Sudden Oak Death

Sudden Oak Death  Home 9 Category: Invaders ( Page 7 ) Background Sudden oak death is a disease affecting species of trees caused by a fungal-like organism. Established in localized areas of North America, the native range of the disease, Phytophthora...
Thousand Cankers Disease

Thousand Cankers Disease

Thousand Cankers Disease  Home 9 Category: Invaders ( Page 7 ) Background Thousand cankers disease is a new threat that has been linked to the death of eastern black walnut trees in the United States over the last decade. The native walnut twig beetle...
Hemlock Woolly Adelgid

Hemlock Woolly Adelgid

Hemlock Woolly Adelgid  Home 9 Category: Invaders ( Page 7 ) Background The hemlock woolly adelgid (HWA) is an aphid-like insect that attacks and kills hemlock trees by feeding on nutrient and water storage cells at the base of needles. It is suspected...