Sumpweed, poverty, or povertyweed (Iva axillaris)

dicamba (Banvel, Rifle, or Clarity)

Rate 1 lb ae/a

Time Apply when plants are actively growing.

Remarks Adding 0.5% (v/v) surfactant enhances control.

Caution Avoid spray drift. Avoid disturbing areas for 7 days after application.

Site of action Group 4: synthetic auxin

Chemical family Benzoic acid

picloram (Tordon)

Rate 1 to 2 lb ae/a

Time Apply during growing season when moisture will be sufficient to carry herbicide into soil. When little moisture will be available, apply in the fall.

Caution Most formulations are restricted-use herbicides. See label for grazing restrictions. Do not contaminate water. Potatoes, beans, and many other broadleaf crops are very sensitive to picloram. Do not use in diversified cropping areas. 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 watershed in a single season.

Site of action Group 4: synthetic auxin

Chemical family Pyridine