Weed Management Handbook

fenoxaprop (Acclaim or Horizon)

Rate 0.15 to 0.25 lb ai/A

Time Apply to actively growing seedlings with two to five leaves. Larger plants are more difficult to control. Apply to rhizome Johnsongrass that is 24 to 60 inches tall and growing actively.

Remarks Rhizome Johnsongrass is only suppressed. Do not apply within 3 weeks after mowing.

2,4-DB (Butyrac) or
alachlor (Lasso) or
atrazine (AAtrex) or
bromoxynil (Buctril) or
clomazone (Command) or
clopyralid (Stinger or Transline) or
diuron (Karmex) or
glyphosate or
metolachlor (Dual) or
metribuzin (Sencor)
oxyfluorfen (Goal) or
paraquat (Gramoxone Max) or
picloram (Tordon) or
terbacil (Sinbar)

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

triclopyr amine (Garlon 3A, Brush-B-Gone, or Brush Killer) or triclopyr ester (Garlon 4, Pathfinder, or Vinex) or glyphosate (Accord, Glypro, or Rodeo)

Rate at least 41% active ingredient (3 lb ae or 4 lb ai) glyphosate

Remarks Basal bark application: apply 33% dilution of triclopyr or glyphosate to exposed stems after stripping the leaves from stems near ground level.

2,4-D LV ester

Rate 5 lb ae 2,4-D in 100 gal water

Time Apply in the early bloom stage.

Remarks Foliage must be thoroughly wet.

Caution Avoid drift to sensitive crops.

Site of action Group 4: synthetic auxin

2,4-D LV ester

Rate 2 lb ae/A

Time Early spring to actively growing plants before they bloom.

Remarks Sticky seeds can contaminate wool. Mowing before seed production helps alleviate wool contamination.

Caution Avoid drift to sensitive crops.

2,4-D LV ester

Rate 1 lb ae/A

Time Apply when horseweed is in the seedling to rosette stage of growth.

Remarks Plants should be actively growing at time of treatment.

Caution Avoid drift to sensitive crops and desirable vegetation. This product will injure or kill sensitive broadleaf plants.

aminocyclopyrachlor + chlorsulfuron (Perspective)

Rate 1.8 to 3.2 oz/A aminocyclopyrachlor + 0.7 to 1.3 oz/A chlorsulfuron (4.5 to 8 oz/A of product)

Time Apply to actively growing plants in spring.

2,4-D LV ester

Rate 2.5 lb ae/A

Time Apply in early spring when plants are actively growing.

Remarks Spot treatment only. Re-treatments are necessary to control this resprouting species. Mechanical treatments must control roots 4 to 6 inches deep.

glyphosate

Rate 1.5 lb ae/A

Time Apply in spring during the bolting stage.

Remarks Avoid physical contact with the plant.

Caution Controls grasses as well as other vegetation in treated area.

Site of action Group 9: inhibits EPSP synthase

dicamba (Clarity)

Idaho only

Rate 0.125 to 0.375 lb ai/A (1 to 3 pints/A Clarity)

Time Apply when plants are in rosette stage of growth. Use higher rates when treating dense or tall vegetative growth.

Remarks This is a Sandoz Agro, Inc. 2(ee) recommendation for use only within Idaho.