Perennial Weed Control (Quackgrass, Field Bindweed, Canada Thistle, Johnsongrass, etc.)

glyphosate (several trade names)

Rate 2.25 to 3.75 lb ae/a. For nonsodded quackgrass, use 0.75 to 1.5 lb ae/a. For sodded quackgrass, use 1.5 to 2.25 lb ae/a.

Time Apply preplant to full-grown weeds at least 10 days before planting crop or as a spot treatment in the crop. See label for growth stage of perennial weeds.

Remarks Use highest rate on field bindweed.

Caution Do not apply to weeds stressed by drought, weather, or maturity. Rain within 6 hours after application may reduce effectiveness. Control weed escapes the following years. If used as a spot treatment in the growing crop, do not treat more than 10% of the field. Do not harvest or graze within 14 days after treatment.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted