dicamba (Clarity)
Idaho only
Rate 0.125 to 0.375 lb ai/A (1 to 3 pints/A Clarity)
Time Apply when plants are in rosette stage of growth. Use higher rates when treating dense or tall vegetative growth.
Remarks This is a Sandoz Agro, Inc. 2(ee) recommendation for use only within Idaho.
Caution Avoid drift to sensitive crops.
Site of action Group 4: synthetic auxin
Chemical family Benzoic acid
metsulfuron (Escort and others)
Rate Escort: 0.3 to 0.45 oz ai/A (0.5 to 0.75 oz/A)
Time Apply to actively growing plants.
Remarks Using a nonionic or silicone surfactant will increase effectiveness. Application sites differ between products; consult label.
Caution Apply only to pasture, rangeland, and non-crop sites.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
picloram (Tordon)
Rate 0.25 to 0.5 lb ai/A (1 to 2 pints/A Tordon)
Time Apply in spring when actively growing before full bloom, or in late summer.
Remarks Tank mix 1 lb ae/A of 2,4-D with the lower rate of picloram.
Caution Most formulations are restricted-use herbicides. Do not apply if circumstances favor movement from treatment site.
Site of action Group 4: synthetic auxin
Chemical family Pyridine