Lythrum, purple, or purple loosestrife (Lythrum salicaria) and wand loosestrife (Lythrum virgatum)

glyphosate (Rodeo)

Rate 1% solution with hand-held equipment

Time Apply to actively growing plants at full to late flowering stage. Seedlings may be effectively treated early in the season after a fall application to mature plants.

Remarks Use 0.5% v/v nonionic surfactant. Thoroughly wet foliage but avoid runoff.

Caution Glyphosate is nonselective. It will injure or kill vegetation it contacts.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

imazapyr (Habitat)

Rate 0.25 to 0.5 lb ae/A

Time Apply to actively growing loosestrife after midbloom until killing frost.

Remarks Add suitable adjuvant to spray solution.

Caution Before using, note crop rotation restrictions. Do not apply to root zone of desirable trees.

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

Chemical family Imidazolinone

metsulfuron (Escort and others)

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

Time Apply to actively growing plants.

Remarks Using a nonionic or silicone surfactant increases effectiveness. Before using, check label to see whether product can be used on the type of site intended. 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

triclopyr (Garlon 4 or Garlon 3A)

Rate 1.5 to 2% concentration for application with handgun sprayer.

Time When plant is in midbloom to full-bloom stage or early in season on seedlings.

Remarks Labeled for use on nonirrigation ditch banks and in seasonally dry wetlands.

Site of action Group 4: synthetic auxin

Chemical family Pyridine