New Plantings

acetic acid (Weed Pharm Weed and Grass Killer)

Rate 15 to 30 gal product/a

Remarks 20% acetic acid. Apply as a directed application to actively growing small weeds in row middles only. Use application equipment that is hooded or shielded. Any contact with the crop will cause crop injury. Approved for organic production.

Caution This product is a contact, nonselective, herbicide. Avoid contact with desirable foliage, green bark, or fruit.

carfentrazone-ethyl (Aim EC)

Row middles only

Rate 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. Consult label for adjuvant selection and instructions.

Caution Apply to row middles only, 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)

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

Remarks Consider environmental and plant growth conditions that affect leaf uptake; see label for guidelines. Limited observations suggest that April treatments may cause slight cupping and browning of petals or blossoms. Add crop oil concentrate as described on label.

Caution Do not exceed 32 oz/a Select 2EC per season.

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

Chemical family Cyclohexanedione

DCPA (Dacthal Flowable)

Rate 9 lb ai/a (12 pints/a)

Time Apply soon after transplanting, or preplant incorporate.

Remarks Applications west of Cascades usually perform erratically. Inhibits mitosis.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Phthalic acid

fluazifop-p-butyl (Fusilade DX)

Rate 0.09 to 0.25 lb ai/a (6 to 16 fl oz/a product)

Time Apply to actively growing grasses or within 7 days after irrigation as a directed spray with 1% crop oil or 0.25% nonionic surfactant. Pre-harvest interval 14 days.

Remarks Identify grasses and adjust rates depending on susceptibility and stage of weed growth as label instructs. Results often are erratic on grasses stressed from lack of vigor, high temperature, low fertility, or drought. More mature grasses and quackgrass can be controlled but may require two applications. Annual bluegrass and all fine fescues resist treatment. Inhibits fatty acid production, cell membranes, and new growth.

Caution Do not exceed 16 fl oz/a per season. Do not apply after fruit set or when fruit is present.

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

Chemical family Aryloxyphenoxy propionate

flumioxazin (Chateau and Warfox)

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

Time Apply a minimum of 30 days prior to transplanting strawberry if planting through a plastic mulch. Can be applied broadcast over the top of dormant and newly transplanted crowns.

Remarks May provide some burnback of existing broadleaf weeds. Adding an adjuvant enhances weed burnback but may lead to crop spotting.

Caution Do not exceed 3 oz/a at this timing. Do not apply after fruit set or when fruit is present.

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

Chemical family N-phenylphthalimide

glyphosate (several products)

Rate Consult label

Time Apply to weeds at least 3 days before transplanting.

Remarks Do not apply after transplanting. Inhibits production of three amino acids and protein synthesis.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted.

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 before weeds germinate, or after cultivating to remove growing weeds.

Remarks Requires sprinkler irrigation the same day to wet soil 2 to 4 inches deep. Applications during the growing season may delay or inhibit rooting (pegging) of runners. Some growers apply 2 lb ai/a at planting to minimize root pruning and pegging problems, then an additional 2 lb ai/a in fall. Inhibits root growth.

Caution Do not apply from bloom through harvest.

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 Apply preemergence as a broadcast spray to the soil surface before or within 7 days after transplanting strawberries.

Remarks Most effective if rain or irrigation incorporates herbicide into weed emergence zone within 7 days. Do not apply to strawberry bed if bed is later to be covered with plastic.

Caution Stunting, reduced growth, or reduction in daughter plants may result. Refer to main labels for crop rotation restrictions.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

sethoxydim (Poast)

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

Time Apply at optimum growth stage listed on label.

Remarks Identify susceptible grasses and add 2 pints/a of a nonphytotoxic crop oil concentrate to improve leaf absorption. Control often is erratic on grasses stunted or stressed by drought, high temperatures, or low fertility. Resistant grasses include annual bluegrass and all fine fescues, but quackgrass can be suppressed. Inhibits fatty acid production, cell membranes, and new growth.

Caution Do not exceed 2.5 pints/a per season.

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

Chemical family Cyclohexanedione

S-metolachlor (Dual Magnum)

Oregon only

Rate 0.95 lb ai/a (1 pint/a Dual Magnum)

Time Apply post-transplant prior to weed emergence, dormant before new growth, or after renovation.

Remarks Special Local Needs Label OR-180010

Caution Application to strawberry plants with adjuvants and nitrogen sources (ammonium sulfate) may increase crop injury. Do not exceed 0.95 lb ai/a (1 pint/a) per application, or two application per season or 2 pints/a (1.9 lb ai/a). Irrigate within two days after application. Irrigate 0.5 inch on coarse-texture soils and 1 inch on fine-texture soils. Pre-harvest interval is 30 days.

Site of action Group 15: inhibits very long chain fatty acid synthesis (VLCFA)

Chemical family Acetamide

sulfentrazone (Spartan 4F)

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

Time Apply preplant or post-transplant, prior to weed emergence.

Remarks Preemergent applications must be activated by sufficient irrigation (0.5 to 1 inch) within 7-10 days. Strawberries are listed on the federal Spartan 4F label but Oregon and Washington SLN labels (OR-110009 and WA-110007) provide use pattern and directions more appropriate to Oregon and Washington production systems.

Caution Application to strawberry plants with newly 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 WDG)

Rate 0.1 to 0.1.5 lb ai/a (2 to 3 oz/a Sinbar)

Time After transplanting but before new runner plants start to root.

Remarks If strawberry transplants are allowed to develop new foliage prior to Sinbar application, the application must be followed immediately by 0.5 to 1 inch of irrigation or rainfall to wash the herbicide off the strawberry foliage.

Caution Do not use on sandy, loamy sands, gravelly soils, or soils with less than 2% organic matter. Inhibits photosynthesis.

Site of action Group 5: photosystem II inhibitor

Chemical family Uracil