Crupina, common (Crupina vulgaris)

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 4.75 to 8 oz/a

Time Apply to seedlings in spring when plants are actively growing.

Remarks Adjuvants can be used; these include methylated seed oils 0.5 to 1% v/v, nonionic surfactants at 0.25 to 1% v/v, and crop oil concentrates at 1%v/v.

Caution Do not apply to the root zone of desirable trees and shrubs. May injure or kill some grass species.

Site of action (aminocyclopyrachlor) Group 4 synthetic auxin; (chlorsulfuron) Group 2: acetolactate synthase (ALS) inhibitor

Chemical family (aminocyclopyrachlor) Pyrimidine carboxylic acid ; (chlorsulfuron) Sulfonylurea

aminopyralid + metsulfuron (Opensight)

Rate 3 to 3.3 oz/a

Time Apply to seedlings in spring when plants are actively growing.

Remarks Adjuvants can be used; these include methylated seed oils 0.5 to 1% v/v, nonionic surfactants at 0.25 to 1% v/v, and crop oil concentrates at 1%v/v.

Caution May injure or kill some grass species.

Site of action (aminopyralid) Group 4 synthetic auxin; (metsulfuron) Group 2: acetolactate synthase (ALS) inhibitor

Chemical family (aminopyralid) Pyrimidine carboxylic acid ; (metsulfuron) Sulfonylurea

chlorsulfuron (Telar and others)

Rate 0.75 to 0.195 oz ai/a (1 to 2.6 oz/a).

Time Apply to seedlings in spring when plants are actively growing.

Remarks Add 0.25% by volume of nonionic surfactant to spray mixture.

Caution Avoid drift to sensitive crops.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Sulfonylurea

clopyralid (Transline)

Rate 2 oz ae/a (0.33 pints/a).

Time Apply as a split application to common crupina foliage in fall and spring.

Remarks Most effective on young plants.

Caution Do not contaminate water. Potatoes, beans, and many other crops are very sensitive to clopyralid. Do not use in diversified cropping areas.

Site of action Group 4 synthetic auxin

Chemical family Pyridine

dicamba (Banvel and others)

Rate 0.5 lb ae/a (1 pint/a)

Time Apply to seedlings in spring when plants are actively growing.

Caution Avoid drift to sensitive crops.

Site of action Group 4: synthetic auxin

Chemical family Benzoic acid

metsulfuron (Escort and others)

Rate 0.3 to 0.6 oz ai/a (0.5 to 1 oz/a)

Time Apply to seedlings in spring when plants are actively growing.

Remarks Add 0.25% by volume of nonionic surfactant to spray mixture. Application sites differ between products; consult labels.

Caution Avoid contacting sensitive crops. Apply only to pasture, rangeland, and non-crop sites.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Sulfonylurea

picloram (Tordon)

Rate 4 to 8 oz ae/a

Time Apply to seedlings in spring when plants are actively growing.

Caution Most formulations are restricted-use herbicides. See label for grazing restrictions. Do not contaminate water. Potatoes, beans, and many other crops are very sensitive to picloram. Do not use in diversified cropping areas. At rates above 0.5 lb ae/a (1 quart/a), apply only as spot treatment not to exceed 25% of a landowner's acreage in a given watershed in a single season.

Site of action Group 4: synthetic auxin

Chemical family Pyridine