Postemergence or Foliar-applied Treatments

clethodim (Envoy Plus and several others)

Many bulbs and flower beds

Rate 0.09 to 0.18 lb ai/a (12 to 32 oz/a).

Time Apply postemergence to actively growing annual or perennial grasses as listed on label.

Remarks For grass control in ornamental plantings. Controls annual bluegrass. Applications made to grass plants stressed by insufficient moisture, hot or cold temperatures, or to grass plants exceeding recommended growth stages may result in unsatisfactory control.

Caution Do not exceed 68 fl oz/a per season. Test for crop safety before applying to landscape species not listed on the label.

fenoxaprop ethyl (Acclaim Extra)

Daylilly, iris and others

Rate 13 to 39 fl oz/a

Remarks Adjust rates depending on number of grass tillers (see label). Ensure thorough coverage to actively growing, susceptible grasses. Repeat after grass begins active growth but do not exceed 120 fl oz/a per season. Inhibits fatty acid production, cell membranes, and new growth.

Caution Determine crop tolerance before extensive use.

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

Chemical family Aryloxyphenoxy propionate

fluazifop (Fusilade II)

Alyssum, marigold, petunia, geranium, iris, zinnia, and many others; not for tulips

Rate 0.25 to 0.375 lb ai/a (16 to 24 fl oz/a)

Time Apply to actively growing grasses or within 7 days after irrigation with 0.25% nonionic surfactant when susceptible grasses are in the labeled growth stage.

Remarks Check label for crops that can be injured by over-the-top applications. Identify grasses and adjust rates depending on susceptibility and stage of weed growth as label instructs. Results often are erratic on grasses stressed from lack of vigor, drought, high temperature, or low fertility. More mature grasses and quackgrass can be controlled but may require two applications. Annual bluegrass and all fine fescues resist treatment. Inhibits fatty acid production, cell membranes, and new growth.

Caution Do not tank mix with other pesticides. Do not apply within 5 days of other pesticide treatments.

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

Chemical family Aryloxyphenoxy propionate

sethoxydim (Segment II)

Chrysanthemum, coleus, gladiolus, impatiens, iris, marigold, snapdragon, petunia, tulip, zinnia, and others

Rate 0.28 to 0.47 lb ai/a (1.5 to 2.5 pints/a)

Time Apply at optimum growth stage listed on the label.

Remarks Identify susceptible grasses. 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. Inhibits fatty acid production, cell membranes, and new growth.

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

Chemical family Cyclohexanedione