Tansy, common (Tanacetum vulgare)

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 1.8 to 3.2 oz/a aminocyclopyrachlor + 0.7 to 1.3 oz/a chlorsulfuron (4.5 to 8 oz/a of product)

Time Apply to actively growing plants in spring.

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. Can be applied using an invert emulsion rather than water.

Caution Even low rates can kill nontarget tree and shrub species, so avoid application within a distance equal to the tree height of the sensitive species. Do not allow spray to drift off target. Can injure several grass species including bromes, as well as basin wildrye.

Site of action (aminocyclopyrachlor) Group 4: Synthetic auxin; (chlorsulfuron) Group 2: ALS inhibitor

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

chlorsulfuron (Telar)

Rate 0.75 to 2.25 oz ai/a (1 to 3 oz/a)

Time Apply to actively growing vegetation in the spring.

Remarks Use on non-cropland only.

Caution Do not allow spray drift to sensitive crops.

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

Chemical family Sulfonylurea

dicamba (Banvel, Rifle, or Clarity) + picloram (Tordon)

Rate 1 to 2 lb ae/a dicamba + 0.5 lb ae/a picloram

Time Apply from early flower bud development to bloom stage.

Remarks This combination is more effective than applications of the individual products.

Caution Tordon is a restricted-use herbicide. See label for grazing restrictions. For rates above 0.5 lb ae/a (1 quart/a), apply only as a spot treatment not to exceed 25% of a landowner's acreage in a particular watershed in a single season. Avoid drift to sensitive crops. Do not contaminate water. Potatoes, beans, and many other broadleaf crops are sensitive to these herbicides. Do not use picloram in diversified crop areas.

Site of action (both) Group 4: synthetic auxin

Chemical family (dicamba) Benzoic acid; (picloram) Pyridine

metsulfuron (Escort and others)

Rate Escort: 0.6 oz ai/a (1 oz/a)

Time Apply to actively growing vegetation in the spring.

Remarks Use a surfactant at 0.25% v/v.

Caution Do not allow spray drift to sensitive crops. Apply only to pasture, rangeland, and non-crop sites. Application sites differ between products; consult labels.

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

Chemical family Sulfonylurea