Trim Oak Trees now to Prevent the Spread of Oak Wilt


Oak wilt is caused by the fungus Ceratocystis fagacearum. Oak wilt can be spread in two ways: 1) fungal spores travelling tree to tree through grafted roots, and 2) fungal spores spread by sap beetles that fly from infected trees or wood to healthy trees. The beetles are attracted to fresh wounds in healthy trees, and these wounds offer an introduction point for the fungus.Trimming or cutting healthy oaks from the months of November through March helps to prevent fresh wounds in healthy trees when the beetles are active. Trimming away dead and dying branches during this period can help prevent oak wilt spreading from neighboring areas to your trees. If your oak trees still need trimming before this spring, be sure to do it before the end of March. April 1 through July 15 is considered the high risk period, and all trimming of oaks should be avoided. July 15 through October 31 is considered low risk, but spread is still possible. Red oaks and pin oaks are especially susceptible to oak wilt, and once infected, a healthy tree is killed within ​months.

Unfortunately, oak wilt is very common in Anoka County. More information on prevention of the disease in your yard can be found at https://extension.umn.edu/plant-diseases/oak-wilt-minnesota
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Lessard-Sams Outdoor Heritage Council Recommends Funds for Rum River Stabilization Projects

The Lessard-Sams Outdoor Heritage Council is recommending $952,000 from the Outdoor Heritage Fund for ACD to stabilize eroding Rum Riverbanks utilizing habitat-building, bioengineering approaches over the next three years. Bioengineering techniques stabilize and armor eroding riverbanks in a way that both protects the bank from further erosion and provides traversable habitat for wildlife. These techniques rely on using natural materials such as tree trunks and root wads, in-stream rock weirs, native plantings and tree staking, gradual slope grading, and minimal hard armoring where necessary. Current erosion along streambanks, as well as traditional armoring techniques like riprap, result in a wall or barrier to wildlife. The bioengineering techniques that will be employed by ACD in the Rum River will eliminate those barriers and provide additional habitat for all kinds of wildlife.

ACD has identified over twenty eroding banks along the Rum River in Anoka County that it will be seeking to address with these funds. It is anticipated that four to eight sites will be stabilized with the $952,000 from the LSOHC and an additional $236,000 in local funds from Anoka County and the Upper and Lower Rum River Watershed Management Organizations. Anoka County has pledged $442,000 in Rum River stabilization matching funds over the next five years. The remaining funds will be used as match for future grant applications.

The Lessard-Sams Outdoor Heritage Council has made the funding recommendation to the Minnesota Legislature, who will draft final bill language during the 2020 legislative session. ACD will begin reaching out to landowners with identified eroding banks suitable for these stabilization techniques after the funding is finalized.

  Example photo of an eroding Rum Riverbank stabilized with bioengineering techniques. This project was the result of the continuing partnership between ACD and Anoka County Parks.

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