imazamox (Raptor) + bentazon (Basagran 5L)
Oregon and Washington only
Rate 0.04 lb ai/A (5 fl oz/A Raptor) + 0.25 to 0.5 lb ai/A (0.4 to 0.8 pints/A Basagran 5L)
Time Apply when crimson, red or white clover has at least two trifoliolate leaves and most weeds are 1 to 3 inches tall. Imazamox applications to clover grown for seed must be made before bloom.
Remarks Applications of imazamox to clover grown for seed require adding surfactant, nitrogen fertilizer, and Basagran 5L herbicide. Use a nonionic surfactant with at least 80% ai at 0.25% v/v (1 quart/100 gal spray solution). Apply to red, white, and crimson clover only.
Caution Application of more than 16 fl oz/A of Basagran in the tank mix may reduce grass control. When using Raptor plus Basagran 5L, always follow the more restrictive label. Do not apply Raptor more than once per growing season. Imazamox use on crimson, red, or white clover may cause crop injury or loss when applied at the 5 oz/A rate to stressed clover. See additional use cautions on Raptor label including crop rotation intervals.
Site of action (imazamox) Group 2: acetolactate synthase (ALS) inhibitor; (bentazon) Group 6: photosystem II inhibitor
Chemical family (imazamox) Imidazolinone; (bentazon) Benzothiadiazole
imazethapyr (several trade names)
Rate 0.05 to 0.094 lb ai/A
Time Apply to seedling clover that has at least two to three trifoliolate leaves, and when most weeds are 1 to 3 inches tall. Imazethapyr may be applied to established clover in the fall, and in spring to dormant or semi-dormant clover less than 3 inches tall. Imazethapyr applications to clover grown for seed must be made before bloom.
Remarks Applications of imazethapyr to clover grown for seed require adding surfactant and nitrogen fertilizer. Use a nonionic surfactant with at least 80% ai at 0.25% v/v (1 quart/100 gal spray solution).
Caution Do not feed, graze, or harvest clover within 30 days of applying imazethapyr.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Imidazolinone
paraquat (several trade names)
Rate 0.26 to 0.78 lb ai/A
Time Apply to fall-planted, newly established, or well-established stands between November 15 and January 15, when crop is dormant and before spring growth starts.
Remarks To control winter annual grasses and broadleaf weeds in red and white clover. Add 1 to 2 pints of a nonionic surfactant or 1 gallon crop oil concentrate per 100 gal water. For dense stands of grass, paraquat plus pronamide provides better control than paraquat alone. Green foliage on crop at time of application will be burned.
Caution A restricted-use herbicide. Do not graze or harvest treated forage for 60 days after applying. Do not apply more than once per season. When applying to fall-planted red clover in its first winter, or to red clover planted with a nurse crop the previous spring use the lowest labeled rate. Do not apply if re-growth after grazing or cutting is more than 2 inches tall.
Site of action Group 22: photosystem I electron diversion
Chemical family Bipyridilium