Herbicides labeled for use in Utah, Colorado, and Idaho

Pre-emergent
Crop Weeds Treated Formulation Name
(active ingredient)
Remarks
Apple, pear, cherry annual and perennial grasses and broadleaves Casoron 4G (dichlobenil) Apply Nov. to March when soil temp is below 45° F.  Rain/irrigation is needed for activation; shallow incorporation recommended.
ALL annual broadleaves and suppression of grasses Chateau WDG (flumioxazin) Limited to 24 oz per year.  Moisture is necessary to activate pre-emergence applications.  Apple:  apply only between harvest and pink stage.  Stone fruit and pear:  apply only between harvest and bud break.
ALL annual grasses and broadleaves Devrinol 50DF (napropamide) Apply late fall to early spring.  Moisture needed within 24 hours of application.  Maximum 1 application/year.
ALL annual broadleaves and suppression of grasses Goal 2XL (oxyfluorfen) Do not apply between bud swell and harvest. (Dormant application only).
Apple, pear, peach annual grasses and broadleaves Karmex DF  (diuron) Do not treat trees grafted on full dwarf rootstocks.  Maximum 1 application/year.
ALL annual and perennial grasses and listed broadleaves Kerb 50-WR (pronamide) Apply as post-harvest application when temperatures are below 55? F.  Rain or irrigation required to activate.  Maximum 1 application/year.
ALL annual grasses and broadleaves Matrix FNV (rimsulfuron) Weeds are controlled 60-90 days after application.  If weeds are present at application, a labeled burn down herbicide such as glyphosate, or paraquat, will improve control.  Do not use in mix water above 8.0 pH.  Best results when soil is moist at the time of application and 0.5 inch rainfall occurs within 2 weeks of treatment.
Apple, pear, tart cherry annual grasses and broadleaves Princep 4L (simazine) One application per year.  Do not apply to gravelly or sandy soil. In Idaho it is registered for all fruit tree crops.
Apple, peach annual grasses and broadleaves Sinbar 80 WP (terbacil) Maximum rate is 1 lb per year. Can be used on non-bearing pear, cherry, apricot, and plum.
ALL annual grasses and broadleaves Solicam DF* (norflurazon) Apply from fall to early spring.  Rainfall or irrigation of 0.5 inch is necessary for activation.
ALL annual grasses and listed broadleaves Surflan AS   (oryzalin) Rainfall or irrigation to 0.5 inch required for activation.
R = restricted use pesticide * = not for use on stone fruits on western slope in Colorado
Post-emergent
Crop Weeds Treated Formulation Name
(active ingredient)
Remarks
ALL annual broadleaves; green suckers Aim EC (carfentrazone) Use anytime of the season, always with surfactant.  Mix with glyphosate or paraquat for better control.
ALL annual and some perennial broadleaves Amine 4, Saber, others (2,4-D amine) Do not apply during bloom or near irrigation times.  Do not apply to bare ground.  Maximum 2 applications per year and 75 days between applications.
ALL annual broadleaves and suppression of grasses Chateau WDG (flumioxazin) Apple:  apply only between harvest and pink stage.  Stone fruit and pear:  apply only between harvest and bud break.  Limited to 24 oz per year.  Use with an adjuvant.
Stone fruits listed annual and perennial grasses Fusilade DX (fluazifop-P) Always add non-ionic surfactant.  Rainfast in 1 hour. 
ALL annuals and some perennial grasses and broadleaves glyphosate Rate depends on weed species and stage of growth.  Does not provide residual control; can be mixed with labeled pre-emergence herbicides.  Avoid contact with all tree parts.
ALL most annual grasses and broadleaves and top kill of perennial weeds Gramoxone SLR (paraquat) Repeat applications are necessary for sustained control.  Always add non-ionic surfactant.  Maximum 5 applications/year.
Pome fruits, peach annual grasses and broadleaves Karmex DF (diuron) Pome fruits:  apply March – May only.  Do not treat trees grafted on full dwarf rootstocks.  Maximum 1 application/year.
ALL but plum
(plum is non-bearing application only)
annual and perennial grasses Poast (sethoxydim) Use with 1.25% oil.  Do not mix with other herbicides.  Do not apply within 1 hour of rainfall.  Will not work on drought-stressed grasses. 
ALL annual and perennial grasses and broadleaves Scythe 4.2E BIO (pelargonic acid) Contact non-selective burn down control of a variety of weeds.  Can be mixed with glyphosate.
Stone fruits perennial broadleaves Stinger (clopyralid) Apply while weeds are generally small and actively growing.  Do not exceed 2/3 pt/ac/year.  Highly leachable in light soils.
ALL annual grasses and listed broadleaves Surflan (oryzalin) Mix with glyphosate or paraquat.  Rainfall or irrigation to 0.5 inch required for activation.
ALL annual and perennial broadleaves Venue (pyrafluven ethyl) Use from post-harvest to pre-bloom only.  Contact herbicide.  More effective on weeds less than 4 inches tall.  Do not make more than 3 applications/year.  Mixing with glyphosate or paraquat improves effectiveness.  Spray water must be less than 7.5 pH.
R = restricted use pesticide BIO = EPA-listed biopesticide
Non-bearing
Crop Weeds Treated Formulation Name
(active ingredient)
Remarks
ALL annual broadleaves and suppression of grasses Chateau WDG (flumioxazin) Do not apply to trees established less than one year, unless protected with non-porous wraps.
ALL listed annual and perennial grasses Fusilade DX (fluazifop-P) Always add non-ionic surfactant.  Rainfast in 1 hour. 
ALL listed broadleaves Gallery 75 (isoxaben) Pre-emergence only.  Only apply to settled soil with no cracks.  Rainfall or irrigation of 0.5 inch required within 21 days of application.
ALL annual and perennial grasses Poast (sethoxydim) Use with 1.25% oil.  Do not mix with other herbicides.  Do not apply within 1 hour of rainfall.  Will not work on drought-stressed grasses.  Peach, nectarine, and plum are very tolerant of Poast and it may be applied over the top of non-bearing trees.
ALL annual grasses and listed broadleaves Prowl 3.3 EC (pendimethalin) Pre-emergence herbicide.  Use before bud swell.  Rain or irrigation required within 21 days of application. 
ALL annual grasses and broadleaves Reglone (diquat) Post-emergence herbicide.  Complete coverage essential. 
ALL most annual and perennial grasses Select 2EC (clethodim) Post-emergence herbicide.  Mix with non-ionic surfactant (not oil).  Rainfast in 1 hour. Not registered in Idaho.
Stone fruits annual grasses and broadleaves Showcase (triflualin+isoxaben +oxyfluoren) Pre-emergence, dormant applications only.
Apple, apricot, cherry, peach, pear, plum annual grasses and broadleaves Sinbar (terbacil) For non-bearing, newly-planted trees, make the first application after a significant rainfall or irrigation that will settle the soil around the base of the tree.
ALL annual grasses and listed broadleaves Snapshot 2.5 TG (isoxaben+trifluralin) Pre-emergence herbicide; 0.5 inch rain or irrigation required within 3 days of application. 
ALL annual and perennial broadleaves Venue (pyrefluven ethyl) Do not allow spray to contact green bark of trunk area.  Contact herbicide.  More effective on weeds less than 4 inches tall.  Do not make more than 3 applications/year.  Mixing with glyphosate or paraquat improves effectiveness.  Spray water must be less than 7.5 pH.