Pests & Diseases


5 Common Fungal Diseases Killing Seattle Trees

February 23, 2024

Discover five prevalent fungal tree diseases in Seattle, including a description of their symptoms, causes, transmission, treatment, and preventive measures.

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A hairy, blue and red spotted spongy moth caterpillar crawls on green vegetation.

Protecting Your Trees from Spongy Moths in Seattle and Puget Sound

October 18, 2023

Safeguard your Seattle trees from the devastating spongy moth! Get the info you need to fight back against this voracious Seattle tree eater!

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A single, green, winter moth caterpillar crawls along a branch of chewed, holey, green leaves.

A Pest that Prefers the Cold – Battling Winter Moths

September 21, 2023

Winter Moths invade Seattle! Uncover the hidden dangers and learn how to protect your trees from these cold-hardy pests. Read on to learn more!

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A hairy, blue and rust spotted spongy moth caterpillar crawls on a green leaf, ready to make it a meal.

4 Seattle Tree Pests – Recognize the Threat

July 20, 2023

Four hungry insect pests are threatening your trees. Learn to identify these Seattle tree pests and to recognize the damage they cause.

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Oak tree leaves with yellow and brown spots.

Is Your Tree Sick? 10 Signs and Symptoms to Look For

June 27, 2023

These ten symptoms of a sick tree can mean that your Seattle tree is unhealthy and needs an arborist inspection and treatment for insect infestation or disease.

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A green emerald ash borer on a leaf with its wing casings partially spread, displaying its red abdomen.

The Emerald Ash Borer is Heading to Seattle

April 13, 2023

The emerald ash borer is an invasive ash tree pest heading toward Seattle. As it devastates ash trees across the country, people ask the same questions. When will EAB arrive in Seattle, what can we do to stop it, and how can we protect our ash trees before it arrives?

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A stand of white brich trees, the target of the bronze birch borer, a common Seattle pest.

Bronze Birch Borer: Symptoms, Causes, Treatment & Prevention

June 21, 2022

Bronze birch borer is killing birch trees throughout the King County area. Learn how to spot the early signs and get effective treatment to save your trees.

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Oak Tree Decline: Signs, Symptoms & Prevention

September 1, 2021

“Oak tree decline” is a term used to describe a complex and systemic problem frequently found in oak trees. Unless drastic action is taken, this complex disease usually results in the death of the tree.

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Evergreens Turning Brown: Causes, Prevention & Treatment

February 1, 2021

Seattle Tree Care Explains the Impact Weather Can Have on Evergreens What Causes Evergreens to Change Color? Evergreens bring a splash of green to Seattle 365 days a year. But what happens when the gorgeous green starts turning brown? If you’re worried about your Evergreen plants or are looking for ways to keep them healthy,…

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