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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...