Woad, dyer's (Isatis tinctoria)

2,4-D LV ester

Rate 1.9 to 2.85 lb ae/a

Time Apply in spring or fall to rosettes, or in early summer when plant is in bud.

Remarks For satisfactory control, it may be necessary to treat infested areas during both the rosette and bud stages of growth.

Caution Avoid drift to sensitive crops.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy acetic acid

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 oz ai/a (1 oz/a Telar)

Time Apply before or after weeds emerge. Results are best on young, actively growing weeds.

Remarks Constantly agitate while mixing and spraying. Add 0.25% v/v nonionic surfactant to spray mixture. Labeled for use on pasture, range, Conservation Reserve Program (CRP), and non-cropland.

Caution Use on non-cropland only. Avoid contact with sensitive crops. Can persist in soil. Do not treat powdery, dry soils or light, sandy soils if rain is not likely soon after treatment. Do not apply to frozen ground.

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

Chemical family Sulfonylurea

imazapic (Plateau)

Rate 0.125 to 0.188 lb ai/a

Time Apply to rosettes or after blossoms open (full bloom) until plants desiccate.

Remarks Add 1 quart/a methylated seed oil to the spray mix.

Caution Before using, note crop rotation restrictions.

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

Chemical family Imidazolinone

metsulfuron (Escort and others)

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

Time Apply to actively growing plants.

Remarks Use a nonionic or silicone surfactant.

Caution Do not let 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 Sulfonylure