St. Johnswort (Hypericum perforatum)

2,4-D

Rate 2 lb ae/a in 50 gal of water

Time Apply before any blossoms open, preferably on new seedlings after germination.

Remarks Repeat applications as needed. Klamath beetles are preferred to control large infestations.

Caution Avoid drift to sensitive crops.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy acetic acid

metsulfuron (Escort and others)

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

Time Apply after weeds emerge.

Remarks Use a surfactant to increase effectiveness.

Caution Apply only to pasture, rangeland, and non-crop sites. Application sites differ among products; consult labels.

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

Chemical family Sulfonylurea