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Fact Sheets

Learn more about the pests, diseases, and problems affecting your trees in the greater Seattle area.

Arborists wearing gloves carefully planting a balled-and-burlapped tree in a Seattle yard, demonstrating proper tree planting techniques for Arbor Day in the Pacific Northwest.

Post Planting Guide

This proactive approach diminishes future pruning requirements for mature trees.

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Pear Trellis Rust

The disease exhibits a complex life cycle involving two
host plants, Pear and Juniper.

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Sequoia Pitch Moth

This chewing moth feeds on coniferous trees such as pines, firs, and spruce.