Forest Health | CrowWingSWCD

Forest Health and Invasive Species

Learn more about common forest pests and health problems, and what you can do to help by visiting the resources listed below.

Crow Wing SWCD has funds to assist landowners with invasive species management and removal, oak wilt treatment, and forest stand improvement practices.

Questions? Contact Us.

Buckthorn

Common buckthorn, and glossy buckthorn are the two non-native, invasive buckthorn species found in Minnesota. These buckthorn species were first brought here from Europe as a popular hedging material. They became a nuisance plant, forming dense thickets in forests, yards, parks and roadsides. They crowd out native plants and displace the native shrubs and small trees in the mid-layer of the forest where many species of birds nest.

Buckthorn threatens the future of forests, wetlands, prairies, and other natural habitats and Contributes to erosion by shading out other plants that grow on the forest floor.

Learn More About Buckthorn

Emerald Ash Borer

The emerald ash borer is an invasive pest responsible for the deaths of millions of ash trees across the eastern United States and southeastern Canada. Originating from eastern Russia, northern China, Japan, and Korea, this insect targets and destroys weak and healthy ash trees.

Every ash species in North America is at risk. With close to one billion ash trees in Minnesota, emerald ash borer poses significant threat to our forests and communities.

Learn More About Emerald Ash Borer

Oak Wilt

Oak wilt is a lethal disease that impacts all oak species in Minnesota. Oak Wilt is caused by an invasive, non-native fungus. This fungus infiltrates the water-conducting vessels of oak trees, ultimately leading to their death. While all oak species are susceptible, red oaks (with pointed lobes) typically perish about two months post-infection. Bur oaks may die within one to seven years, while white oaks can survive for one to over 20 years after infection.

The spread of oak wilt occurs in two main ways: above ground via sap beetles and below ground through interconnected roots known as root grafts.

Learn More About Oak Wilt

Brush Management

Brush management techniques are effective for landowners managing forests with invasive woody species. These species are highly prolific in seed production and thrive in shaded environments, which gives them a competitive edge over native flora. If left unchecked, they can dominate and even displace native plants, trees, and shrubs.

Benefits of Brush Management:

Eliminates competition, allowing beneficial vegetation to thrive
Fosters growth of a desired plant community
Enhances wildlife habitats
Promotes tree regeneration
Boosts tree growth and overall health

Forestry Conservation Practices

Tree and Shrub Planting

Tree and shrub planting involves introducing woody plants to an area through methods such as planting seedlings or cuttings, direct seeding, or allowing for natural regeneration. Once established, these plants create wildlife habitats, offer potential forest products, and provide long-term erosion control. Additionally, they enhance air and water quality, sequester carbon, and improve the area's visual appeal.

Click below to learn how to choose the right tree, plant it in the ideal spot, and provide the necessary care.

Tree Planting and Care