Weed Management Handbook

triclopyr + 2,4-D (Crossbow)

Washington only

Rate Washington special local needs label only (WA-130001). Consult label for mixing and application rate instructions for basal application or hack-and-squirt methods.

Caution Do not replant susceptible broadleaf trees within 12 months of application.

glyphosate (numerous product names)

Rate Read label carefully for crops listed and geographic location.

Time Apply 6 to 8 oz/A to suppress (chemically mow) perennial grass covers between tree rows in orchards.

2,4-D (Saber, Orchard Master, Unison, Weed Rhap A-4D, Embed Extra)

Rate 0.7 to 0.95 lb ae/A (1.5 to 2 pints/A Saber; 3 to 4.5 pints/A Unison; check labels for specifics)

Time Apply in 100 gal/A water; add nonionic spreader-sticker. Apply to suckers 6 to 9 inches long, but better results are observed when treating suckers less than 3 inches. Limited to four applications per season with at least 30 days between applications.

2,4-D amine (Saber, Weed Rhap A-4D, or Dri-Clean Herbicide)

Rate 0.95 to 1.4 lb ae/A (2 to 3 pints/A Saber for stone fruits and nuts only); 3 pints/A for Weed Rhap A-4D)

dichlobenil (Casoron)

Rate 4 to 6 lb ai/A (100 to 150 lb/A Casoron 4G)

Time Apply midwinter, immediately before a cold rain to reduce volatility and improve weed suppression.

clethodim (Select Max and others)

Rate 0.068 to 0.121 lb ai/A (9 to 16 oz/A Select Max)

Time Apply postemergence to actively growing annual or perennial grasses as listed on label.

Remarks Consider environmental and plant growth conditions that affect leaf uptake (see label for guidelines).

glyphosate (numerous product names)

Rate Read label carefully for crops listed and geographic location.

Time Apply lower rates for actively growing annual weeds.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

The herbicides selected for weed and brush control depend on the species composition, proximity of crops, degree of control required, and whether it is for site preparation or conifer release. The commonly used control methods and typical herbicides used are described below.

Major Herbicides and Common Brand Names of
Forest Management Products