Iris, wild (Iris spp.)

2,4-D LV ester

Rate 5 lb ae 2,4-D in 100 gal water

Time Apply in the early bloom stage.

Remarks Foliage must be thoroughly wet.

Caution Avoid drift to sensitive crops.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy acetic acid

glyphosate

Product labeled for aquatic sites

Rate 5% solution of a 4 lb ae (5.4 lb ai) glyphosate

Time Apply prebloom or in the fall.

Remarks Use a nonionic surfactant recommended for aquatic sites

Caution Glyphosate is nonselective and may injure or kill desirable species.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

imazapic (Plateau)

Rate 0.188 lb ae/a

Time Apply postemergence at the late boot or bloom stage.

Remarks Use a methylated seed oil at 1 quart/a; do not exceed 25 gal/a spray volume.

Caution Before using, note crop rotation restrictions.

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

Chemical family Imidazolinone

imazapyr (Habitat)

Rate 0.75% v/v product

Time Apply prebloom or in the fall.

Remarks Use a surfactant the label recommends.

Caution Before use, note rotation and other restrictions on label

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

Chemical family Imidazolinone

metsulfuron (Escort and others)

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

Time Apply to actively growing plants.

Remarks Use a surfactant to increase effectiveness. Application sites differ among products; consult labels.

Caution Apply only to pasture, rangeland, and non-crop sites.

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

Chemical family Sulfonylurea