bentazon (several trade names)
Oregon and Washington only
Rate Up to 1 lb ai/A
Time Apply in spring to young, actively growing weeds in crimson, red, and white clover grown for seed in Washington and Oregon.
Remarks Controls certain broadleaf weeds and sedges soon after emergence. For consistent control, always add an adjuvant. See labels for recommended additives. Some clover leaf burning may occur, but symptoms generally are outgrown within 10 days of treatment. A second application may be made 5 to 14 days following the first.
Caution Thorough coverage is necessary for adequate weed control. Do not apply to stressed clover. Do not graze livestock or harvest forage or hay for at least 36 days after treatment. Do not exceed 2 lbs ai/A per year of bentazon.
Site of action Group 6: photosystem II inhibitor
Chemical family Benzothiadiazole
carfentrazone (Aim EC)
Rate 0.008 to 0.04 lb ai/A (0.5 to 2.5 oz/A Aim EC)
Time Apply Aim EC in the fall after the crop is dormant or in the spring before spring growth starts.
Remarks Apply as a broadcast spray to dormant clover that has been established for at least 1 year. May be tank mixed with other herbicides labeled for use in clover grown for seed. Use rates up to 2.5 oz in 10 gal of water for optimal control. Always add an adjuvant. See Aim EC label for recommended additives.
Caution Do not harvest stands grown for seed for 3 days after application. Do not apply more than 3.8 oz of Aim EC per year.
Site of action Group 14: protoporphyrinogen oxidase (PPO) inhibitor
Chemical family Triazolinone
MCPA amine (several trade names)
Rate See individual product labels for appropriate rate, but generally 0.23 to 0.46 lb ae/A
Time Apply to arrowleaf, crimson, red and white clover (except Dutch). Treat seedling stands after they have 2 or more true leaves (trifoliate stage). Apply in late fall or early spring to established stands when weeds are small and clover is semi-dormant, before active growth starts.
Remarks To control broadleaf weeds in seedling and established stands of clover.
Caution Older, established clover stands may show stem twisting injury after application, which may reduce growth. Do not apply to Dutch white clover or sweet clover. The air temperature at time of application should be above 40°F to maximize weed control efficacy. Do not forage or graze treated areas for 7 days after treatment and review individual product labels for additional feeding and grazing restrictions.
Site of action Group 4: synthetic auxin
Chemical family Phenoxy acetic acid