Tree Pests and Diseases

Worried about oak wilt? Learn when it spreads, how to recognize symptoms, and the best times to prune, treat, and protect Lake Minnetonka oak trees.

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If you live in the Twin Cities, you’ve likely seen them—shiny green-and-copper beetles munching away on leaves in mid-summer. These are Japanese beetles, and while they’ve been in Minnesota for decades, they’re still one of the most damaging pests to trees, shrubs, and lawns.

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If you are managing a property, a lot, an estate, a campus, and you start to see one or two trees look like they’re in trouble, is it important to call someone in fast? How fast does the disease spread across a lot of trees? Watch the video below as Jim Ostvig, owner of Ostvig…

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Not sure whether or not a tree on your property has a leaf disease? Ostvig Tree Care can diagnose and treat diseases, so contact us today.

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Emerald Ash Borer (EAB) is a pest infestation that has become a major problem in the U.S. over the last 10 years. It is a native beetle of Asia.

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This past week we were asked to inventory oak trees in a western suburb of Minneapolis.  The charge was to identify and mark trees with oak wilt disease and to identify homes with trees showing symptoms of bur oak blight (BOB).  Based on our observations, homeowners in the community with affected trees will be notified…

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Spider mites on spruce, oaks and shrubs The moist weather conditions that are creating a bumper crop of mosquitoes are also benefiting other pests in the Twin Cities. The Japanese beetle population this year was higher than the last two years combined. According to Jeff Hahn, University of Minnesota Extension Entomologist, all signs point to…

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Japanese beetles are again wreaking havoc on trees, shrubs, vines and flowers throughout the Twin Cities.  While adult beetles can be found congregating and feeding on many flowers, including roses (Figure 1), they also feed on the foliage of many species of trees including some conifers. (Figure 1) Preferred species such as apples, crabapples and…

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In caring for your landscape this spring, it’s important that you include an evaluation of potential tree diseases that are affecting your landscape. Below we cover four common diseases that heavily affect Minnesota. Dutch Elm Disease (DED) Dutch Elm Disease (DED), which first hit St. Paul in 1961, is an important tree disease to know…

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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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