Sulphur Knapweed Moth (Agapeta zoegana) — These bright yellow moths were introduced from Europe in 1984 to help combat the spread of knapweed. Females lay eggs in the plant’s stem crevices and the larvae mine into the roots to feed and overwinter. Adults emerge in early July through September. They have been released in AZ, CA, CO, ID, MN, MT, NE, NV, ND, OR, SD, UT, WA, WI, and WY and are now established in these states. Photo by Heather McKee on 7/25/17 in Missoula, MT.