Annual Grass

clethodim (Select, Select Max and several other trade names)

Rate 0.094 to 0.25 lb ai/a (6 to 16 fl oz/a Select 2EC) or 0.068 to 0.243 lb ai/a (9 to 32 fl oz/a Select Max 0.97EC)

Time Apply to actively growing grasses 1 to 6 inches tall.

Remarks Apply when the first grass weed species in a mixed grass weed population reaches recommended growth stage for treatment. Be aware that clethodim is formulated as 0.97, 2, and 3 lb ai/gal; be sure to use the correct amount of herbicide. For glyphosate resistant volunteer corn use Select Max at 6 fl oz/a on volunteer corn up to 12 inches tall, 9 fl oz/a on 24 inch tall volunteer corn and 12 fl oz/a on 36 inch tall volunteer corn. With Select Max always use nonionic surfactant at 0.25% v/v (1 quart/100 gal spray solution). With Select 2EC always use nonionic surfactant at 0.25% v/v (1 quart/100 gal spray solution) or crop oil concentrate at 1 quart/a with ground applications, or 1% v/v (1 gal/100 gal spray solution), but not less than 1 pint/a by air. Add 2.5 to 4 lb/a spray grade ammonium sulfate (AMS) fertilizer in addition to crop oil concentrate may be added to enhance quackgrass, wild oats, volunteer cereals and volunteer corn control with Select 2EC. In arid regions where irrigation is used to supplement limited rainfall, clethodim should be applied within 7 days after irrigation. In general, a second application of clethodim will control perennial grasses more effectively than a single application. Make the second application to actively growing grass 2 to 3 weeks after emergence of new growth. Cultivation of treated grasses 7 days prior to or within 7 days after application may reduce weed control. Do not apply if rain is expected within 1 hour of application. Refer to label for information on tank mixing with broadleaf herbicides. Restricted entry interval (REI) is 24 hours.

Caution Pre-harvest interval is 40 days. Do not apply more than 64 fl oz/a (0.5 lb ai/a) per season of Select Max.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Cyclohexanedione

fluazifop (Fusilade DX)

Rate 0.094 to 0.375 lb ai/a (6 to 24 fl oz/a Fusilade DX 2EC), depending on weed species

Time Apply to actively growing grasses 1 to 6 inches tall.

Remarks Apply with 0.5% to 1% crop oil concentrate or once-refined vegetable oil concentrate containing 15% to 20% approved emulsifier (0.5 to 1 gal/100 gal spray solution) or 0.25% to 0.5% v/v (1 to 2 quarts/100 gal spray solution) nonionic surfactant containing at least 75% surface-active agent. Diammonium phosphate (aqueous ammonium polyphosphate), commonly sold as a solution (10-34-0) can be added to the spray mixture at a rate of 2 pints/a. Refer to label for information on tank mixing with broadleaf herbicides. Maintain a minimum of 14 days between applications. Where irrigation is used as part of normal cropping practice, best results are obtained when fluazifop is applied within 7 days after irrigation. Fusilade is rainfast 1 hour after application. Restricted entry interval (REI) is 12 hours.

Caution Do not use flood-type or other spray nozzle tips that deliver coarse, large droplet sprays. Do not harvest sugar beets within 90 days after last application. Do not exceed 48 fl oz/a per year. Do not harvest sugar beets within 90 days of last application.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Aryloxyphenoxy-propionate

quizalofop P-ethyl (Assure II or Targa)

Rate 0.034 to 0.083 lb ai/a (5 to 12 fl oz/a Assure II 0.88EC or Targa 0.88EC)

Time Apply to actively growing grasses from three-leaf to early tillering stage.

Remarks Controls annual grass weeds and volunteer small grains. Can use quizalofop at 2.5 fl oz/a for preplant burndown of grass weeds. Subsequent flushes of grass require additional treatment. For volunteer glyphosate resistant corn, quizalofop may be tank mixed with glyphosate. Use 4 fl oz/a for up to 12 inch volunteer corn, 5 fl oz/a for 12 to 18 inch volunteer corn, and 8 fl oz/a on 18 to 30 inch corn. Use a petroleum-based crop oil concentrate at 1% v/v (4 quarts/100 gal spray solution) containing at least 80% high-quality petroleum or modified vegetable seed oil with at least 15% surfactant emulsifiers. Or use a nonionic surfactant at 0.25% v/v (1 quart/100 gal spray solution) containing at least 60% nonionic surfactant with a hydrophilic/lipophilic balance (HLB) greater than 12. Ammonium nitrogen fertilizer such as 28% or 32% N used at 2 quarts/a or 2 lb/a of spray-grade ammonium sulfate (AMS) may be added to the spray mixture, but is not required. For aerial applications, apply 0.5% v/v (2 quarts/100 gal spray solution) of crop oil concentrate. Do not apply if rain is expected within 1 hour of application. Restricted entry interval (REI) is 12 hours.

Caution Do not apply more than 4 applications per acre per season. Allow 7 or days between application. Do not exceed 25 fl oz/a per season. Do not mix with broadleaf herbicides unless listed on the label. Do not apply through any type of irrigation equipment. Do not harvest within 45 days after application.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Aryloxyphenoxy-propionate

sethoxydim (Poast)

Rate 0.19 to 0.47 lb ai/a (1 to 2.5 pints/a Poast 1.5EC)

Time Apply to actively growing grasses at grass growth stage indicated on label.

Remarks See label for application rates, which differ by grass species and size. Sugar beets at all stages of growth are tolerant. In irrigated areas, apply 2 to 4 days after irrigation for best results. Always add oil concentrate at 2 pints/a. Annual bluegrass and fine fescues are not controlled. Spray volunteer grain up to 4 inches tall, but before tillering. Spray wild oat when 2 to 4 inches tall. Sethoxydim is most effective on actively growing grasses that are not stressed. Always add Sundance HC spray adjuvant at 1 pint/a, or a crop oil concentrate (COC) to the spray tank at 2 pints/a. Add urea ammonium nitrate (UAN) at 4 to 8 pint/a, or ammonium sulfate (AMS) at 2.5 lb/a for controlling crabgrass, volunteer corn, and all volunteer cereals. Volunteer cereals emerging from May through July may be partially or incompletely controlled because of unfavorable conditions at application time. Can be tank mixed with Betamix without COC, UAN or AMS. Add nitrogen to COC or MSO to improve control. Do not apply if rain is expected within 1 hour of application. Restricted entry interval (REI) is 12 hours.

Caution Do not exceed 2.5 pints/a Poast per application or 5 pints/a Poast in 1 year. Apply at least 60 days before harvest.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Cyclohexanedione