Figure 1. Jackson Island on the Snake River northeast of Rupert, Idaho.
Figure 2. Galls that will be placed within existing stands of Canada thistle on the island.
Figure 3. Gall fly egg.
Figure 4. Gall fly egg.
Stem Gall Fly (Urophora
cardui) Application on Jackson Island for Canada Thistle Control
Figure 1. Jackson Island on the Snake River northeast of Rupert, Idaho.
Figure 2. Galls that will be placed within existing stands of Canada thistle on the island.
Figure 3. Gall fly egg.
Figure 4. Gall fly egg.