Keeping Your Spokane-Area Trees Healthy: Common Tree Diseases and How to Prevent Them

Here in the beautiful Inland Northwest, our trees are a vital part of what makes our homes and landscapes so special. From Spokane to Coeur d'Alene and the surrounding communities, we're blessed with a diverse range of beautiful trees. But just like any living thing, our trees can sometimes fall ill. As a homeowner, understanding the common tree diseases in our region is the first step toward protecting your leafy friends and preserving the beauty and value of your property.

At American Tree, we're passionate about trees, and we want to empower you to keep your trees healthy and thriving. In this post, we'll explore some of the most common tree diseases we see in the Spokane area, and what you can do to prevent them.

Common Tree Diseases to Watch For

While there are many potential ailments that can affect our trees, a few are particularly common in our region's climate and soil conditions. Here are some of the top culprits to keep an eye out for:

• Fire Blight: This destructive bacterial disease can make your trees look as though they've been scorched by fire. It primarily affects fruit trees like apples, pears, and crabapples, but can also impact other ornamentals. You'll notice blackened, wilted leaves and shoots, and cankers that may ooze a brownish fluid. Fire blight spreads quickly, so early detection is key.

• Anthracnose: A fungal disease that loves the cool, wet weather of our springs, anthracnose can affect a wide range of trees, including sycamore, ash, maple, and oak. Symptoms include dark, sunken lesions on leaves, stems, flowers, and fruit. In severe cases, it can lead to significant leaf drop and branch dieback.

• Powdery Mildew: If you notice a white, powdery substance on the leaves of your trees, you're likely dealing with powdery mildew. This fungal disease is common on a variety of trees and shrubs, including lilac, crabapple, and some species of oak. While it's usually not fatal, it can stress the tree and make it more susceptible to other problems.

• Pine Beetles: A major threat to our region's iconic ponderosa pines, the pine beetle can cause widespread damage. These tiny insects bore into the tree's bark to lay their eggs, and in the process, introduce a fungus that can block the tree's ability to transport water and nutrients. Signs of a pine beetle infestation include small holes in the bark, sawdust-like frass at the base of the tree, and a change in the color of the pine needles from green to a yellowish-brown.

• Cytospora Canker: This fungal disease often attacks trees that are already stressed due to drought, injury, or other factors. It's common in spruce, pine, and other conifers. You'll notice cankers (dead sections of bark) on branches and the main trunk, which may ooze a resin-like substance.

Prevention is the Best Medicine

The good news is that many common tree diseases can be prevented with proper care and maintenance. Here are some proactive steps you can take to protect your trees:

• Water Wisely: Consistent, deep watering, especially during the hot, dry summer months, is crucial. Healthy, well-hydrated trees are much better at fending off diseases.

• Prune with Purpose: Regular pruning removes dead or diseased branches, which can be a breeding ground for pests and pathogens. Proper pruning also improves air circulation through the canopy, which can help prevent fungal diseases.

• Mulch Your Trees: A layer of mulch around the base of your trees helps retain soil moisture, regulate soil temperature, and suppress weeds. Just be sure to keep the mulch from piling up against the trunk, as this can create a haven for pests and diseases.

• Inspect Your Trees Regularly: Make a habit of walking around your property and inspecting your trees for any signs of trouble. The earlier you catch a problem, the easier it will be to treat.

• Choose the Right Tree for the Right Place: If you're planting new trees, be sure to select species that are well-suited to our local climate and soil conditions, and that are resistant to common diseases.

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When to Call in the Professionals

While these preventative measures can go a long way, some tree diseases are difficult to diagnose and treat without professional expertise. If you notice any of the symptoms we've described, or if you're just not sure what's going on with your trees, it's always best to consult a certified arborist.

At American Tree, our team of experienced professionals can accurately diagnose any tree health issues and recommend the most effective treatment options. From disease management and pest control to expert pruning and, when necessary, safe and efficient tree removal, we're here to help you keep your trees healthy and beautiful for years to come.

Don't wait until it's too late! If you're concerned about the health of your trees, contact us today for a consultation. Or, if you're in need of tree services in the Spokane area, you can get a free quote online.

Your trees are a valuable asset. Let's work together to protect them!