Postemergence Weed Control within Containers

clethodim (Envoy Plus)

Rate 0.09 to 0.24 lb ai/a (12 -32 fl oz) with max of 64 fl oz/season

Time For selective postemergence grass control. Apply postemergence to actively growing annual or perennial grasses as listed on label. Consider environmental and plant growth conditions that affect leaf uptake; see label for guidelines.

Caution Do not exceed 68 fl oz/a per season.

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

Chemical family Cyclohexanedione

fluazifop (Fusilade II or Ornamec Over-the-Top)

Rate 0.25 to 0.375 lb ai/a (1 to 1.5 pints/a Fusilade II)

Time Apply to actively growing grasses or within 7 days after irrigation with 0.25% nonionic surfactant.

Remarks May be used in greenhouses. Applied over the top of nursery plants for selective postemergence grass control. Identify grasses and adjust rates depending on susceptibility and stage of weed growth according to label instructions. Note lists of ornamentals and associated instructions regarding topical versus directed sprays. 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 or apply within 5 days of other pesticides. Grazing is prohibited.

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

Chemical family Aryloxyphenoxy propionate

sethoxydim (Segment or Vantage)

Rate 0.28 to 0.47 lb ai/a (36 to 60 fl oz/a)

Time Apply at optimum growth stage indicated on label.

Remarks For selective postemergence grass control. Identify susceptible grasses. Control often is erratic if grasses are 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