Tag Archives: powdery mildew

Common Tree Diseases

The key to maintaining beautiful trees is being able to understand the basics of tree health.  Spot these common tree diseases before they irreversibly ruin your tree’s health with help from our quick guide.

Fire Blight

perdue-university-fire-blight

Fire Blight via Perdue University

You may have noticed fire blight during the summertime, as the bacteria is most active in warm, moist weather.  Trees affected by fire blight appear to have “scorched” branches, leaves and twigs, leaving them brown or black.  This disease can be spread by infected pruning tools, bees and rain.

The solution to fire blight is simple:  prune!  Call your professional arborist as soon as you notice fire blight to prevent it from spreading.  Proper pruning is essential, so be sure to have a professional aborist take care of it.

The Emerald Ash Borer Beetle

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Tree infected by the EAB beetle via The Emerald Ash Borer Resource Guide

Trees infected by the Emerald Ash Borer or EAB beetle are characterized by a thinning or dying crown, and erratic growth along the trunk.  Infected trees often attract woodpeckers, as the birds are harvesting the beetles in the bark.  The sure sign of an EAB infestation/infection are unique “D”-shaped holes where the beetles have exited the trees.

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The EAB via The National Park Service

An EAB infestation is serious and can be spread to other trees in the surrounding area.  Contact Westchester Tree Life at the first sign of an EAB infestation.

Tip:  When you are unable to diagnose what is wrong with your plants, trees or shrubs, call a professional arborist.  Westchester Tree Life can assist by providing a detailed evaluation as well as a plant health care plan to keep you on the right track!

Powdery Mildew

Powdery Mildew Fungi on Pumpkin Leaves

Powdery mildew on pumpkin leaves via Pure Nutrients

Have you noticed powdery mildew accumulating on your leaves?  This white coating forms during dry, cloudy weather with high humidity, and can be caused by a variety of fungi.  You may notice that powdery mildew tends to grow on plants in shaded areas.

To prevent powdery mildew, seek out resistant varieties of trees and shrubs.  Ask your local arborist which available fungicides will work best to protect your plants, trees and shrubs.