Trade name(s) Prism, Select, Envoy, Volunteer, Arrow, Section, Trigger, SelectMax, Shadow, Intensity

Manufacturer(s) Valent, Tenkoz, Albaugh, Arysta, Winfield, Loveland

Formulation(s) 0.94, 0.97 and 2 lb/gal emulsifiable concentrate

Remarks A selective postemergence grass-control herbicide. Controls most annual and perennial grasses except fine fescues. Using a crop oil concentrate enhances activity.

Storage conditions Stable

Acute toxicity LD50 - 2,920 mg/kg

Action in plant Inhibits growing points in grasses.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Cyclohexanedione

Sugar Beets

Don Morishita
Revised March 2015

Note All rates listed are stated as broadcast equivalent (i.e., the amount that would be required for weed control if broadcast sprayed between rows as well as in the row). If sugar beet herbicides are applied in a band, the amount required for 1 acre of beets can be calculated as: broadcast equivalent x (band width ÷ distance between rows).

SUGAR BEETS—Annual Grass and Broadleaf Weeds

dimethenamid-P (Outlook)


Pamela J.S. Hutchinson
Revised March 2015

POTATOES—Volunteer Grain, Weed, or Grass Cover Crop Control before Planting Potatoes

carfentrazone (Aim EC)

Rate Up to 0.031 lb ai/A (2 fl oz Aim EC)

Time Apply before potatoes have been planted.


Rick Boydston
Revised March 2015

MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop

napropamide (Devrinol 50 DF, Devrinol DF-XT, Devrinol 2XT)

Rate 4 lb ai/A (8 lb/A product)


Rick Boydston
Revised March 2015

HOPS—Annual Grass and Broadleaf Weeds

flumioxazin (Chateau SW)

Rate 0.19 lb ai/A (6 oz/A product).

Time Apply to dormant hops January thru March in a 1- to 1.5-foot band to each side of the hop row. Rain following application will improve preemergence weed control.

Corn (Field, Silage, and Seed Corn)

Joel Felix
Revised March 2015

CORN—Herbicide-resistant Corn

Herbicide-resistant field corn is now commonly grown in the Pacific Northwest. There are four major types of herbicide resistant corn: some that are genetically engineered; and some that are developed by genetic selection of tolerant corn individuals and/or varieties. Failure to apply the correct herbicide to the correct crop will result in serious injury to the corn. Refer to the appropriate herbicide label for guidelines on how to use each product on herbicide-resistant corn.

Canola (including Rape Seed)

Don Wysocki
Revised March 2015

CANOLA—Annual Grass and Some Broadleaf Weeds

ethalfluralin (Sonalan)

Rate 0.55 to 0.95 lb ai/A (5.5 to 9.5 lbs/A Sonalan 10G); 0.56 to 0.938 lb ai/A (1.5 to 2.5 pints/A Sonalan HFP)

Time Apply preplant and incorporate following label instructions.

Clover Seed

Andrew Hulting
Revised March 2015

CLOVERS—Red, White, Crimson, and Arrowleaf


benefin (Balan DF)

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

Time Before planting clover, benefin must be incorporated into the top 2 to 3 inches of the seedbed.

Birdsfoot Trefoil

Tim Prather
Revised June 2014

2,4-DB (Butyrac or Butoxone)

Rate 0.5 lb ae/A

Time Apply after trefoil has at least two true leaves.

Remarks Controls certain annual broadleaf weeds in new stands. Weeds should be small at the time of application.

Alfalfa Seed

Tim Prather
Revised June 2014

Note Several herbicides labeled for alfalfa grown for seed are not registered for alfalfa grown for forage.

ALFALFA SEED—Annual Grass and Broadleaf Weeds in New Seedings

benefin (Balan 60 DF)

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

Forage Alfalfa

Tim Prather
Revised June 2014

FORAGE ALFALFA—Annual Grass and Broadleaf Weeds in Establishing New Seedings

benefin (Balan DF)

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

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

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