Johnsongrass in winter wheat should be treated in wheat stubble after wheat harvest. Allow established rhizome Johnsongrass to grow back after wheat harvest to a height of at least 18 inches or the boot to heading stage of growth and spray with one quart or 41% Glyphosate in 4-10 gallons of water per acre. Use 1.5-2 quarts of 41% Glyphosate per acre if using more than 10 gallons of water per acre.
Controlled Droplet Application (CDA) will deliver the lower water rates at a more uniform coverage for better Johnsongrass control. Allow at least 14 days after treatment before tillage or burning of stubble.