Weed Management Handbook

pendimethalin (Prowl H20 and Stealth)

Oregon and Idaho only

Rate 0.95 to 3.8 lb ai/A (1 to 4 quarts/A Prowl H20)

Time Apply to established clover before weeds emerge and before clover is more than 6 inches high. Herbicide is most effective when incorporated into the weed germination zone by rain or irrigation within 7 days of application.

glyphosate (several trade names)

Rate 2.25 to 3.75 lb ae/A. For nonsodded quackgrass, use 0.75 to 1.5 lb ae/A. For sodded quackgrass, use 1.5 to 2.25 lb ae/A.

Time Apply preplant to full-grown weeds at least 10 days before planting crop or as a spot treatment in the crop. See label for growth stage of perennial weeds.

Remarks Use highest rate on field bindweed.

ethalfluralin (Sonalan HFP)

Rate 1.5 to 1.7 lb ai/A (4 to 4.5 pints/A) before nightshade germinates; 1.5 lb ai/A (4 pints/A) before dodder germinates

Time Apply before nightshade germinates and thoroughly incorporate into the top 2 to 3 inches of soil. Apply again in the spring at 1.5 lb ai/A (4 pints/A), before dodder germinates.

glyphosate (several trade names)

Rate 0.5 lb ae/A

Time Apply to actively growing dodder.

Remarks Research has shown that lower rates will control dodder.

pendimethalin (Prowl 3.3, Prowl H2O)

Rate 2 to 4 lb ai/A (2.4 to 4.8 quarts/A Prowl 3.3)

Time Apply to established alfalfa between January 15 and April 30, but before dodder germinates.

asulam (Asulox)

Rate 1.24 to 1.5 lb ai/A (3 to 3.6 pints/A Asulox)

Time Apply when weeds are less than 3 inches tall.

Remarks SLN WA-100008, ID-130002, and OR-140002. Apply as a postemergent application. Symptoms are slow to develop and several weeks are needed for control.

clethodim (Select 2EC, Select Max, Intensity, or Intensity One)

Rate Select 2EC, or Intensity: use 0.094 to 0.25 lb ai/A (6 to 16 fl oz/A product). Select Max or Intensity One: use 0.07 to 0.24 lb ai/A (9 to 32 fl oz/A product).

Time Apply to actively growing annual or perennial grasses in the labeled growth stage.

clethodim (Select 2EC, Select Max, Section Three, Intensity or Intensity One)

Rate Select, Select 2EC, or Intensity: use 0.094 to 0.125 lb ai/A (6 to 8 fl oz/A product). Select Max or Intensity One: use 0.07 to 0.24 lb ai/A (9 to 32 fl oz/A product). Section Three: use 0.094 to 0.24 lb ai/A (4 to 10.5 fl oz/A product).

Time Apply to actively growing annual or perennial grasses at growth stage listed on label.

2,4-DB (Butyrac 200)

Rate 0.5 to 1.5 lb ae/A (1 to 3 quarts/A Butyrac 200 or Butoxone 200)

Time Apply postemergence to small seedling weeds less than 3 inches tall, and when alfalfa seedlings have two to four trifoliate leaves.

benefin (Balan DF)

Rate 1.2 to 1.5 lb ai/A (2 to 2.5 lb/A Balan DF)

Time Apply before planting to a clean, clod-free, soil surface and incorporate 2 to 3 inches deep within 4 hours after application.

Remarks Use 2 lb/A Balan DF on coarse to medium soils and up to 2.5 lb/A Balan DF on fine textured soils. Avoid overlapping spray.