Established Plantings-Early Fall or Winter Applications

Cereal Interplant On sloping land, spring cereals such as barley or oats are sown between rows to reduce or slow runoff and possible erosion. The cereals are killed in spring with cultivation or herbicides before excessive growth.

carfentrazone-ethyl (Aim EC)

Rate May be applied only to row middles at rates up to 0.031 lb ai/a (2 fl oz/a Aim EC) broadcast per application in at least 10 gal/a of finished spray. See label for rate based on target weed species.

Time Apply postemergence to actively growing broadleaf weeds, as listed on label.

Remarks Controls listed broadleaf weeds up to 4 inches tall. Will not control grass weeds. A nonionic surfactant, methylated seed oil, or crop oil concentrate is required. See label for adjuvant selection and instructions.

Caution Apply only to row middles, using a shielded or hooded sprayer that prevents any spray from contacting strawberry plant tissues. Crop will be injured if spray contacts green stem tissues, leaves, blooms, or fruit. See label for hooded or shielded sprayer directions. Do not exceed 6.1 fl oz/a broadcast (0.096 lb ai/a) per season as a row-middle application.

Site of action Group 14: inhibits protoporphyrinogen oxidase (PPO)

Chemical family Triazolinone

clethodim (Select 2EC and others)

Rate 0.09 to 0.125 lb ai/a (6 to 8 oz/a Select 2EC). Consult label for rate required to control different grasses.

Time Apply to actively growing grasses at recommended heights.

Remarks Add crop oil concentrate as described on label.

Caution Do not exceed 8 fl oz/a per treatment or 32 fl oz/a per season. Preharvest interval is 4 days.

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

Chemical family Cyclohexanedione

clopyralid (Stinger)

Oregon and Washington only

Rate 0.125 to 0.25 lb ai/a (0.33 to 0.66 pint/a Stinger)

Time Apply after harvest, from September 15 to November 15.

Remarks SLN labels OR-030031 and WA-030035. Preharvest interval is 30 days.

Caution Do not exceed a total of 0.25 lb ai/a (0.66 pint/a) per year. Do not use with surfactants or tank mix with other herbicides. May cause minor leaf cupping. Do not compost vegetation treated with Stinger.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

DCPA (Dacthal Flowable)

Rate 6 to 9 lb ai/a (8 to 12 pints/a Dacthal Flowable)

Remarks Applications west of Cascades usually perform erratically. Elsewhere, apply in fall or early spring to control late summer weeds. Do not apply after first bloom. Inhibits mitosis.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Phthalic acid

flumioxazin (Chateau and Warfox)

Rate 0.096 lb ai/a (3 oz/a product)

Time Apply during winter dormancy for preemergence weed control.

Remarks May provide some burnback of existing broadleaf weeds. Experience indicates 2.2 oz/a is sufficient for preemergence weed control. Crop oil concentrate at 1% v/v or nonionic surfactant at 0.25% v/v may be added to help control emerged broadleaf weeds.

Caution Do not exceed 3 oz/a at this timing.

Site of action Group 14: inhibits protoporphyrinogen oxidase (PPO)

Chemical family N-phenylphthalimide

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

Rate 4 lb ai/a (8 quarts/a Devrinol 2-XT, 8 lb/a Devrinol DF-XT)

Time Apply fall through early spring before weeds emerge, preferably in November or December.

Remarks If rainfall is not available, requires sprinkler irrigation to wet soil 2 to 4 inches deep to reduce herbicide degradation. Because of possible carryover in wheat rotations, use other weed controls the final year of strawberry production, or plow deeply to dilute soil residue. Inhibits root growth.

Caution Do not exceed 4 lb ai/a per year.

Site of action Group 15: inhibits very-long-chain fatty acid synthesis

Chemical family Acetamide

pendimethalin (Prowl H2O)

Rate 0.71 to 1.4 lb ai/a (1.5 to 3 pints/a Prowl H2O)

Time May be applied to strawberries in fall or winter dormancy, but prior to onset of new seasonal growth from crowns.

Caution Do not apply if new leaves have emerged or are exposed. Stunting, reduced growth, or reduction in daughter plants may result. Refer to main labels for crop rotation restrictions. Preharvest interval is 35 days.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

sethoxydim (Poast)

Rate 0.47 lb ai/a (2.5 pints/a)

Time Apply at optimum growth stage listed on label.

Remarks Identify susceptible grasses; add 2 pints/a of a nonphytotoxic crop oil concentrate to improve leaf absorption. Control often is erratic on grasses stressed from drought, high temperatures, or low fertility. Resistant grasses include annual bluegrass and all fine fescues; quackgrass can be suppressed. Note special precautions on Sinbar applications, based on crop injury experienced in other regions. Never tank mix Sinbar with Poast; wait at least 2 weeks between applying these herbicides.

Caution Do not exceed 2.5 pints/a per season. Preharvest interval is 7 days. Inhibits fatty acid production, cell membranes, and new growth.

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

Chemical family Cyclohexanedione

simazine (Princep 4L)

Oregon and Washington only

Rate 1 lb ai/a (1 quart/a Princep 4L)

Time Apply after harvest at time of bed renovation where overhead irrigation is available for activation, or apply in October or November and activate with rain. Apply only once per year and do not use on sandy or coarse soils.

Remarks Established weed seedlings will not be controlled.

Site of action Group 5: photosystem II inhibitor

Chemical family Triazine

sulfentrazone (Spartan 4F)

Rate 0.125 to 0.25 lb ai/a (4 to 8 oz/a Spartan)

Time Apply to established plantings during dormancy. SLN labels OR-110009 and WA-110007.

Remarks Rainfall or irrigation needed to activate herbicide within 14 days of application. Do not apply within 70 days of harvest.

Caution Application to strawberry plants with new emerged growth is not recommended due to leaf burning and possible stand loss. Do not exceed 0.25 lb ai/a (8 oz/a) per application, or a maximum of 0.375 lb ai/a (12 oz/a) per season. Do not use on coarse, sandy soils with less than 1% organic matter. For use only by those certified and/or licensed as pesticide applicators.

Site of action Group 14: inhibits protoporphyrinogen oxidase (PPO)

Chemical family Triazolinone

terbacil (Sinbar)

Rate 0.1 to 0.3 lb ai/a (2 to 6 oz Sinbar/a)

Time Apply during winter dormancy, before weeds are 2 inches tall or wide. Apply split treatments of up to 0.3 lb ai/a during bed renovation and again in winter; do not exceed 0.4 lb ai/a (8 oz/a) per year. Apply to strawberries established at least 6 months.

Caution Do not use on sandy, loamy sands, gravelly soils or soils containing less than 2% organic matter. Avoid use for 2 years if replanting is planned, and consult label for recropping information.

Site of action Group 5: photosystem II inhibitor

Chemical family Uracil