Select Page
Asian Long-horned Beetle

Asian Long-horned Beetle

Asian Long-horned Beetle Anoplophora glabripennis  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...
Emerald Ash Borer

Emerald Ash Borer

Emerald Ash Borer Agrilus planipennis  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....
Spongy Moth

Spongy Moth

Spongy Moth Lymantria dispar dispar  Home 9 Invaders 9 Category: Forest Pests & Pathogens Background Spongy moth is an insect native to Europe and Asia that has been severely weakening trees across North America. Spongy moth was introduced to...
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 Dendroctonus ponderosae  Home 9 Invaders 9 Category: Forest Pests & Pathogens What is Ontario Doing? To prevent this unwanted invader from coming into the province, Ontario has regulated mountain pine beetle as...
Beech Bark Disease

Beech Bark Disease

Beech Bark Disease Neonectria faginata  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...
Butternut Canker

Butternut Canker

Butternut Canker Ophiognomonia clavigignenti-juglandacearum  Home 9 2021 9 March ( Page 12 ) 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 Ophiostoma ulmi  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...
Oak Wilt

Oak Wilt

Oak Wilt Bretziella fagacearum  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...
Sudden Oak Death

Sudden Oak Death

Sudden Oak Death Phytophthora ramorum  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...
Thousand Cankers Disease

Thousand Cankers Disease

Thousand Cankers Disease Geosmithia morbida  Home 9 Tag: Thousand Cankers Disease 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...
Hemlock Woolly Adelgid

Hemlock Woolly Adelgid

Hemlock Woolly Adelgid Adelges tsugae  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...