Hawkweed, orange (Hieracium aurantiacum), meadow (Hieracium caespitosum), and other non-native species and hybrids

2,4-D (various products)

Rate 1.43 to 1.9 lb ae/a

Time Apply to growing hawkweed before buds form.

Remarks These species may need re-treating and/or the higher rate even under ideal conditions.

Caution Product injures or kills sensitive broadleaf forages. Do not contaminate water.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy acetic acid

aminopyralid (Milestone)

Rate 1 to 1.5 oz ae/a (4 to 6 fl oz/a Milestone)

Time Apply to actively growing plants in the bolting stage of growth. Fall treatments are not effective.

Remarks A nonionic surfactant at 1 to 2 quarts per 100 gal of spray enhances control under adverse environmental conditions.

Caution Do not allow drift to 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

clopyralid (Transline or Stinger)

Rate 0.25 to 0.375 lb ae/a (0.66 to 1 pint/a)

Time Apply after most basal leaves emerge but before buds form. Fall treatments are not effective.

Remarks Consult labels for specific site registrations.

Caution Product injures or kills sensitive broadleaf forages. Do not contaminate water.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

clopyralid + 2,4-D amine (Curtail)

Rate 2 quarts/a Curtail

Time Apply after most basal leaves emerge but before buds form. Fall treatments are not effective.

Remarks Consult label for specific site registrations.

Caution Product injures or kills sensitive broadleaf forages. Do not contaminate water.

Site of action (both) Group 4: synthetic auxin

Chemical family (clopyralid) pyridine; (2,4-D) phenoxy acetic acid

dicamba (Banvel, Rifle, or Clarity)

Rate 2 lb ae/a (2 quarts/a)

Time Apply to growing hawkweed before flowering.

Remarks Re-treat as needed but do not exceed 2 lb ae/a per season.

Caution This product will injure or kill sensitive broadleaf forages. Do not contaminate water. See label for timing restrictions for lactating dairy animals. Remove animals for slaughter from treated areas at least 30 days before slaughter.

Site of action Group 4: synthetic auxin

Chemical family Benzoic acid

picloram (Tordon 22K)

Rate 0.25 lb ae/a (1 pint/a)

Time Apply after most basal leaves emerge but before buds form. Fall treatments also may be effective, but research is limited.

Remarks Consult label for specific site registrations.

Caution Product will injure or kill sensitive broadleaf forages. Do not contaminate water.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

triclopyr + clopyralid (Redeem R&P)

Rate 3 to 4 pints/a

Time Apply when weeds are actively growing.

Remarks Add a nonionic surfactant at surfactant manufacturer's recommended rate. Apply in at least 10 gal/a water by ground.

Caution Do not exceed 4 pints/a per year. Do not allow drift to desirable vegetation. Note label restrictions on overseeding or reseeding.

Site of action (both) Group 4: synthetic auxin

Chemical family (both) Pyridine