pendimethalin (Prowl H20 and Stealth)
Oregon and Idaho only
Rate 0.95 to 3.8 lb ai/A (1 to 4 quarts/A Prowl H20)
Time Apply to established clover before weeds emerge and before clover is more than 6 inches high. Herbicide is most effective when incorporated into the weed germination zone by rain or irrigation within 7 days of application.
Remarks Special local needs labels ID-140003 and OR-070025 (for Stealth) or OR-14006 (Prowl). Controls dodder, most annual grasses, and certain broadleaf weeds as they germinate, but will not control established weeds.
Caution Do not apply to seedling clover. Do not feed or graze clover after applying. Do not cut treated clover for hay or forage. Do not use harvested seed for sprouting. The seed producer must give a copy of the label to the seed conditioner. Processed seed must be labeled "Not for human or animal consumption." Refer to main labels for crop rotation restrictions.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Dinitroaniline
pronamide (Kerb 50W, Kerb SC)
Rate 0.5 to 2 lb ai/A (1 to 4 lb/A Kerb 50W; 1 to 4 pints/A Kerb SC)
Time Apply after clover reaches the trifoliolate leaf stage. Results are best when applied under cool conditions (soil temperature of 55°F or cooler) with rain following. Apply before soil freezes, and to fields where crop residues have been removed or evenly dispersed.
Remarks Controls annual grasses and volunteer cereals in new or established stands. Use higher rate for well-established grasses or volunteer grains. Does not control groundsel, hawksbeard, mayweed, and other members of the Asteraceae family.
Caution A restricted-use herbicide. Do not graze treated field, or harvest for forage, for 120 days after treatment. Do not plant field to cereals or to a grass crop immediately following clovers that were winter killed. See labels for crop rotation restrictions.
Site of action Group 3: microtubule assembly inhibitor
Chemical family Benzamide