Smartweed, dotted or perennial (Polygonum punctatum)

dicamba (Banvel, Rifle, or Clarity)

Rate 2 lb ae/a

Time Apply in March, April, May, or June.

Remarks Foliage must be thoroughly wet.

Caution Controls all legumes in pasture and can temporarily inhibit grass in newly established fields.

Site of action Group 4: synthetic auxin

Chemical family Benzoic acid

picloram (Tordon)

Rate 1 lb ae/a

Time March to June.

Remarks Foliage must be thoroughly wet.

Caution Most formulations are restricted-use herbicides. Do not graze dairy animals on treated areas within 2 weeks after application. Apply rates above 0.5 lb ae/a (1 quart/a) only as a spot treatment not to exceed 25% of a landowner's acreage in a given watershed in a single season. Avoid drift to sensitive crops. Do not contaminate water. Potatoes, beans, and many other broadleaf crops are sensitive to picloram. Do not use in diversified cropping areas.

Site of action Group 4: synthetic auxin

Chemical family Pyridine