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

Johnsongrass : Kentucky IPM

Johnsongrass (Sorghum halepense)

Johnsongrass is a warm-season perennial grass which thrives in corn and soybean fields as well as along roadsides.

Seedling johnsongrass plants have vegetation features similar to those described for wild cane. The primary difference between these two species is that the seedling johnsongrass plant initiates rhizomes about four weeks after emergence, but wild cane does not develop a rhizome.


Rhizomes are underground stems that root at the nodes and curve upward at the tip (Note the rhizome extending out to the left of the root cluster in the picture.)

Leaves of mature johnsongrass plants are smooth and have a prominent midvein. Mature plants may grow to 6 feet or more tall.
Johnsongrass has a membraneous ligule. The leaf blade and leaf sheath are glabrous except for a few hairs at the mouth of some plants.johnsongrass structure

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