Postemergent grass control

clethodim (Select 2EC or others)

Rate 0.094 to 0.125 lb ai/a (6 to 8 fl oz/a Select), depending on whether annual or perennial species dominate.

Time Apply to actively growing grass weeds, including annual bluegrass, at growth stages on label.

Remarks Read label carefully for adjuvant instructions, typically 1% crop oil concentrate without nitrogen solution. Note effects of rain (within 1 hour, application), other pesticides, and cultivation on efficacy.

Caution Nitrogen source fertilizers spray adjuvants are not recommended. Preharvest interval is 30 days.

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

Chemical family Cyclohexanedione

sethoxydim (Poast)

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

Time Apply at optimum growth stage listed on the label.

Remarks Identify susceptible grasses and add 2 pints/a nonphytotoxic crop oil concentrate to improve leaf absorption. Control often is erratic on grasses stunted or stressed from drought, high temperatures, or low fertility. Resistant grasses include annual bluegrass and all fine fescues, but quackgrass can be suppressed.

Caution Preharvest interval is 60 days. Do not exceed 2.5 pints/a per application or 5 pints/a per season.

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

Chemical family Cyclohexanedione