bentazon (Basagran 5L)
Rate 0.5 to 1 lb ai/A (0.8 to 1.6 pints/A) depending on size of weed
Time Apply to small, rapidly growing small annual broadleaf weeds. Not effective if temperature drops below 50°F at night and if daytime does not exceed 70°F. Adjust rate depending on expected weather conditions: more for cold days, less for hot days.
Remarks Controls some broadleaf weeds, including smartweed; suppresses nutsedge. Some leaf-speckling may occur under certain conditions but it is generally outgrown 10 days after treatment. The addition of oil adjuvants may increase the severity of leaf-speckling. Use lower rates in hot weather to avoid crop injury.
Caution Do not tank mix with other herbicides. Do not exceed 4 pints/A per season. Preharvest interval is 30 days.
Site of action Group 6: photosystem II inhibitor
Chemical family Benzothiadiazole
clethodim (Select Max, Intensity One)
Rate 0.07 to 0.12 lb ai/A (9 to 16 oz/A)
Time Apply to actively growing grasses at recommended weed heights.
Remarks Recommended adjuvant is nonionic surfactant at 0.25% v/v, without ammonium sulfate.
Caution Preharvest interval is 21 days. Do not make more than one application per year.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Cyclohexanedione
imazamox (Raptor)
Rate 0.031 lb ai/A (4 oz/A Raptor)
Time Apply after emergence and before the 4th trifoliate and before weeds are 3 inches tall.
Remarks Apply to actively growing weeds. Use a nonionic surfactant at 1 quart100 gal. Avoid repeat applications on the same site to minimize chances of developing resistance to this family of herbicides.
Caution Do not apply after flowering begins. Do not make more than one application per year. Consult label for rotational crops and food or feed restrictions; this herbicide may persist for 26 months. Moldboard plowing may slow breakdown of imazamox and increase chance or carryover in some situations
Site of action Group 2: acetolactate synthase (ALS) inhibitor (imazamox)
Chemical family Imidazolinone
imazethapyr (Pursuit and other trade names)
Rate 0.063 Ib ai/A (4 oz/A Pursuit)
Time Preplant, preemergence, or postemergence (between first and third trifoliate) to actively growing weeds
Remarks Base application timing on weed size and crop growth stage. NIS containing at least 80% active ingredient should be used at 1 quart/100 gal spray solution.
Caution Not all varieties may tolerate imazethapyr equally. Evaluate varietal response on a small area first. DO NOT make more than one application of Pursuit per year. Do not feed treated lentil hay or straw to livestock. Imazethapyr is very persistent and crop rotations intervals may be long; up to 26 months for potatoes, and 18 months for sweet corn.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Imidazolinone