Weed Management Handbook

2,4-D ester

Rate 6 lb ae per 100 gal of spray solution for spot treatments. Add crop oil, diesel oil, or surfactant to increase wetting.

Time Apply before cattail heads appear in spring.

Remarks Foliage must be thoroughly wet. 2,4-D does not control as well as glyphosate but is less expensive. 2,4-D must be reapplied to give satisfactory control.

fluazifop (Fusilade DX)

Rate 0.25 to 0.375 lb ai/A (1 to 1.5 pints/A)

Time Apply to actively growing reed canarygrass.

Remarks Apply with 1% v/v crop oil concentrate or 0.25% v/v nonionic surfactant. Acts very slowly, taking at least 2 weeks and often 4 weeks to show effectiveness. Do not apply to stressed grasses. If weed regrows, repeat application.

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 1.2 to 1.8 oz/A aminocyclopyrachlor + 0.5 to 0.7 oz/A chlorsulfuron (3 to 4.5 oz/A of product)

Time Apply to actively growing vegetation.

dicamba (Rifle or Clarity)

Rate 2 to 4 lb ae/A

Remarks Reported to control this plant, although data are lacking in the Pacific Northwest. Follow label instructions.

Site of action Group 4: synthetic auxin

Chemical family Benzoic acid

imazapyr (Arsenal)

2,4-D LV ester or 2,4-D amine

Rate 2 lb ae/A

Time Before flower buds develop.

Remarks Plants should be actively growing at time of treatment.

Caution Avoid drift to sensitive crops.

Site of action Group 4: synthetic auxin

2,4-D LV ester

Rate 3 lb ae of 2,4-D ester in 100 gal water. Use LV ester formulation plus 3 gal diesel or stove oil for spot treatment.

Time Apply to growing plants. Respraying is necessary for complete control.

Remarks Foliage must be thoroughly wet.

diflufenzopyr + dicamba (Overdrive)

Rate 0.175 to 0.35 lb ae/A (4 to 8 oz/A)

Time Apply to actively growing plants.

Remarks For improved uptake if weeds are under moisture or temperature stress, use a nonionic surfactant or a methylated seed oil.

glyphosate

Rate 1.5 to 3 lb ae/A or 1.5 to 2% solution for handgun sprayer application.

Time Apply to actively growing plants in the spring.

Remarks See Forestry section of this handbook for information on control in conifers. Adding a recommended surfactant improves results.

asulam (Asulox)

Rate 1.6 to 3.3 lb ai/A

Time When bracken is in full frond.

Remarks Apply on uncultivated land, reforestation sites, and Christmas tree plantations only. Asulam has a half-life of 6 to 14 days in soil.

Caution See label for precautions.

dicamba (Rifle or Clarity)

Rate 2 to 4 lb ae/A

Remarks Reported to control this plant, although data are lacking in the Pacific Northwest. Follow label instructions.

Site of action Group 4: synthetic auxin

Chemical family Benzoic acid