Diseases of  Alfalfa  Corn  Soybeans  Wheat

Insect Pests of  Alfalfa  Corn  Soybeans  Wheat

Weeds  Identify  Monocots  Dicots  Grasses  Sedges  Lilies  Broadleaf

Scout Info
Kentucky IPM Pest Information Pages

Pennsylvania Smartweed : Kentucky IPM

Pennsylvania Smartweed (Polygonum pensylvanicum)

Pennsylvania smartweed is a warm-season annual that can often be found in soybean fields, along ditches and in thickets. This broadleaf weed has narrow cotyledons which are about three quarters of an inch in length with rounded tips. Its narrow, somewhat pointed leaves are alternately arranged on the stem. Smartweed seedling
Pennsylvania smartweed Stems and leaf petioles are red in color. Pennsylvania smartweed develops an ocrea, or membranous sheath, around the stem at each node.

Lady's thumb (Polygonum persicaria) is a similar smartweed species that has hair-like bristles on the edges of the ocrea. At flowering, both species develop a long pinkish spike.

This site was created and is maintained by Pat Dillon, Department of Entomology, University of Kentucky, S-225 Agricultural Science Ctr North, Lexington, KY USA  40546-0091 (phone: 859/257-3571). Please send questions or suggestions to: pdillon@uky.edu