Cinquefoil, sulfur (Potentilla recta)

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 4.75 to 8 oz/a

Time Apply to sulfur cinquefoil in the pre-bud stage of growth.

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) Pyridine; (chlorsulfuron) Sulfonylurea

aminocyclopyrachlor + metsulfuron (Streamline)

Rate 4.75 to 9 oz/a

Time Apply to sulfur cinquefoil in the pre-bud stage of growth.

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; (metsulfuron) Group 2: acetotactate synthase (ALS) inhibitor

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

aminopyralid (Milestone)

Rate 1 to 1.75 oz ae/a (4 to 7 fl oz/a)

Time Apply to actively growing plants before the bud stage of growth.

Remarks A nonionic surfactant at a volume of 0.25% enhances control under adverse environmental conditions.

Caution Do not let spray drift onto desirable vegetation. Many forbs (desirable broadleaf plants) can be seriously injured or killed. Do not exceed 7 fl oz/a Milestone per year.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

glyphosate

Rate 1.1 to 2.25 lb ae/a.

Time Apply to sulfur cinquefoil in the pre-bud stage of growth.

Remarks Adequate foliar coverage of sulfur cinquefoil is necessary, and repeat applications may be required to achieve full control. Add nonionic surfactant if not included in the formulation.

Caution Glyphosate is nonselective and injures or kills other vegetation in the treated area.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

metsulfuron (Escort and others)

Rate 0.6 to 1.2 oz ai/a (1 to 2 oz/a)

Time Apply in spring during the rosette stage of growth.

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 0.4 oz ae/a

Time Apply when plants are fully leaved and actively growing or in late fall.

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

triclopyr (Garlon 4)

Rate 0.5 to 1 lb ae/a (1 to 2 pints/a).

Time Apply in spring during the rosette stage of growth.

Remarks Mix with 0.25 to 0.5% by volume nonionic surfactant and apply to all exposed foliage.

Caution Garlon 4 is an ester formulation; do not drift onto sensitive crops. Do not contaminate water.

Site of action Group 4 synthetic auxin

Chemical family Pyridine