05/13/2026
Time for pests to start coming alive.
Once identified it is great to search in the Pacific Northwest Handbook. This is a great resource for pests and diseases in our area.
Here is what they had to say about the Silverspotted Tiger Moth
Pest description and damage Adult moths have a 2-inch wingspan and are brownish or tan with distinct silver-white spots on the wings. The caterpillars can reach 1.5 inches in length and are mostly reddish-brown with some blue-black or yellowish hairs. The caterpillars of the silver-spotted tiger moth feed on the needles, often "tenting" branches with dirty-looking webs. While most of the feeding occurs through fall and winter, the webs are most noticeable in the spring. Minor infestations cause little harm to trees. Douglas-fir is the preferred host, but pine, arborvitae, spruce, and true firs are also attacked.
For biology, life history, monitoring and management
See:
Douglas-fir (Pseudotsuga)-Silver-spotted tiger moth
See "Caterpillar" in:
Common Landscape Pests
Management-chemical control
See Table 2 in:
Chemical Control of Landscape Pests
Here is the full link
https://pnwhandbooks.org/insect/hort/landscape/hosts-pests-landscape-plants/spruce-picea-silver-spotted-tiger-moth