Almost 25,500 acres of Western tent caterpillar defoliation were mapped around the Puget Sound lowlands and the San Juan Islands this year. More activity was seen this year than in recent years. Several years of droughty conditions have likely contributed to this situation. Although the outbreak declined on Whidbey Island, it continued on Vashon Island and the Kitsap Peninsula.

Many suburban areas that were the most heavily defoliated were not flown due to various flight restrictions in central Puget Sound.

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