Plants slow to grow in the fall and early spring. Surface feeding injury on the rhizomes, roots and stems. Plants slow to grow in the spring. Plants stunted in irregular spots in the field, plants often very slow-growing in the spring. Found principally west of the Cascade Mountains.
Plants appear stunted and slow growing from feeding injury on roots and rhizomes.
Feeding injury caused by small and soft-bodied insects often found in large numbers on the undersides of the leaves and along the stems. Feeding may cause stunting, discoloration and leaf curling. Feeding injury caused by small, soft-bodied animals with eight legs visible under 15X magnification. Large numbers found on the underside of leaves. Leaves may have webbing on the undersides.