Tree Pests and Diseases

Learn to identify and treat common tree pests and diseases before they damage your Minnesota trees. From invasive insects to fungal infections, discover how to spot problems early and protect your landscape’s health.

Close-up of bark beetle on tree bark, a common tree pest.
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  • Jim Ostvig | April 10, 2014 | Updated: September 23, 2026 |

    Learn about Bronze Birch Borer

    Bronze Birch Borer (BBB) is a tree pest that can cause major damage for those in the northern United States, including Minnesota.

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  • Jim Ostvig | March 20, 2014 | Updated: September 23, 2026 |

    Learn about Dutch Elm Disease

    Part of our role as tree owners is knowing and understanding conditions that could negatively affect their health. Dutch Elm Disease (DED), which first hit St. Paul in 1961, is an important tree disease to know about if you live in Minnesota. Communities, such as St. Paul, often have a proactive, community approach to DED….

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  • Jim Ostvig | February 27, 2014 | Updated: September 23, 2026 | ,

    4 Spring Tree Pests to Avoid

    Believe it or not, spring is on its way. And while it’s hard to imagine our Minnesota landscape without even a hint of snow, we need to start thinking about the things that will affect the health of our trees, such as tree pests. It is important to be aware of some of the common…

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  • Jim Ostvig | February 21, 2014 | Updated: September 23, 2026 | ,

    Top 5 Leaf Diseases to Treat This Spring

    When you hear “tree disease” you may think of the roots, trunk and branches being affected, but what about the leaves? Certain disease can directly target your tree’s leaves, damaging its overall health and appearance. Luckily, spring is the best time to treat leaf diseases. That’s why it’s important to know the different types, how…

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  • Jim Ostvig | May 30, 2013 | Updated: August 27, 2026 |

    Learn About Emerald Ash Borer

    Emerald Ash Borer (EAB) is a pest infestation that has become a major problem in the U.S. over the last 10 years. The outbreak of these tree pests has forced a quarantine to be placed on Ramsey, Hennepin, Houston and Winona counties, as cases of EAB have been found in areas close to Woodbury, Minnesota,…

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  • Jim Ostvig | May 16, 2013 | Updated: September 25, 2026 |

    Learn About Bur Oak Blight

    While trees are an overall low-maintenance addition to your landscape, tree disease is an unfortunate and common occurrence. Bur Oak Blight (BOB), discovered by Dr. Tom Harrington of Iowa State University, has recently been reported in Ramsey and Hennepin counties. Cases of BOB have been found in Wayzata, Minnesota, among other cities. It is important…

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