clethodim (Envoy)
Consult label for tree species
Rate 0.095 to 0.25 lb ai/A (13 to 34 oz/A Envoy)
Time Apply postemergence to actively growing annual or perennial grasses listed on label.
Remarks Consider environmental and plant growth conditions that affect leaf uptake; see label.
Caution Do not exceed 68 fl oz/A per season.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Cyclohexanedione
lactofen (Cobra)
Rate 0.10 to 0.25 lb ai/A (6.5 to 16 fl oz/A)
Time Apply when weeds are actively growing but are less than 4 inches tall, and when the primary shoot of the conifer has hardened off.
Remarks Cobra is a contact herbicide with some soil residual activity. Do not apply with adjuvants when shoots are young and have not hardened off.
Site of action Group 14: protoporphyrinogen oxidase inhibitor
Chemical family Diphenylether
fluazifop (Fusilade II)
Rate Consult label
Time Apply to established ornamental seedbeds as topical or directed sprays according to lists and associated instructions on the label. Apply to actively growing grasses, or within 7 days after irrigation, with 0.25% nonionic surfactant.
Remarks Identify grasses and adjust rates for susceptibility and stage of weed growth as on label. Results often are erratic if grasses are stressed by lack of vigor, drought, heat, or low fertility. More mature grasses and quackgrass can be controlled but may need 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 pesticide treatments. Grazing is prohibited. Do not apply to grasses which have tillered, formed seed heads, or exceeded listed growth stages. Do not apply to trees, vines, or other listed crops that will be harvested for food/feed within 1 year after application. Maintain a minimum of 14 days between applications. Do not apply a total of more than 72 fl oz/A of Fusilade DX Herbicide per year (1.125 lb ai/A). Do not apply more than 24 fl oz of Fusilade DX Herbicide per acre per application (0.375 lb ai/A). Do not make more than 3 applications per year.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxypropionate
sethoxydim (Segment)
Rate 0.28 to 0.47 lb ai/A (36 to 60 fl oz/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, whereas 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