Chervil, bur (Anthriscus caucalis)

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 1.2 to 1.8 oz/a aminocyclopyrachlor + 0.5 to 0.7 oz/a chlorsulfuron (3 to 4.5 oz/a of product)

Time Apply to actively growing vegetation.

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

metsulfuron (Escort and others)

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

Time Apply to fully leafed-out vegetation before fall leaf coloration.

Remarks Constantly agitate while mixing product in water. Add 0.25% by volume of nonionic or silicone surfactant to spray mixture. Good coverage is essential. 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

triasulfuron (Amber)

Rate 0.28 to 0.56 oz/a Amber

Time Apply to actively growing plants in the fall or spring.

Remarks If native perennial species in the carrot family are present, consider a fall application at the lower rate.

Caution Orchardgrass, red fescue and ryegrasses can be injured by triasulfuron. Preharvest interval is 30 days for hay. There are crop rotational restrictions, see label.

Site of action Group 2: inhibits Acetolactate synthase

Chemical family Sulfonylurea