In 2023, WSDA placed 20,000 traps statewide to detect Spongy moth. A total of 103 spongy moths were found in traps at 13 locations in Western Washington. Survey data has identified two of the 13 areas showing signs that a spongy moth population is in the early stages of establishing. These areas are Steamboat Island Road, Thurston County and Concrete, Skagit County. Both sites are near recreational forestland where spongy moth pose a serious threat.

Of the moths found, 77 were trapped in Thurston County near Steamboat Island Road and Hwy 101. An alternate life stage survey of this area in October 2023 resulted in the discovery of an egg mass providing further evidence of a reproducing population at this site. This area is home to the Schnieder Prairie Oak Tree listed on the County Historic Register since 1990 but has historical documentation back to 1855 when the county was first surveyed. Other important features of this area are the beautiful Pacific Madronas that stay green year-round and would not fare well to defoliation.
 
An additional 13 spongy moths were trapped in Skagit County just north of the town of Concrete near the Lake Shannon Recreational Area. This is the second year of multiple spongy moth detections in this area providing evidence of a reproducing population. This area provides important forested habitat for species like the northern spotted owl and provides recreational activities from boating, fishing, birding, and access to hiking and biking along the scenic Cascade Trail.
 
These spongy moth populations will quickly become a huge problem for the long-term health of the trees, shrubs, and native species that call these areas home. We need to act quickly to eradicate these populations when they are small.

Please continue to review more information on The Pest, The Problem, and The Plan.