Established Plantings-Weed Control in Late Winter and Spring

2,4-D (Formula 40 and others)

Rate 0.9 to 1.4 lb ae/a (1 to 1.5 quarts/a Formula 40)

Time Apply in late winter when crops are dormant, in 20 to 25 gal/a water. Apply before February to mitigate potential injury to fruit.

Remarks Make sure label includes strawberries; follow directions carefully. Triple-rinse and wash spray tank with appropriate cleaners before applying herbicides to other crops.

Caution Do not use unless possible crop injury is acceptable. Avoid using under conditions that favor drift or movement to susceptible crops.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy acetic acid

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. Weed Pharm can be applied up to and including the day of harvest. 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)

Rate Apply 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. Consult label for adjuvant selection and instructions. Can be used up to and including day of harvest.

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

clopyralid (Stinger)

Oregon and Washington only

Rate 0.125 lb ai/a (0.33 pint/a Stinger) in Washington, and 0.25 lb ai/a (0.66 pint/a Stinger) in Oregon

Time Apply in spring, before first bloom.

Remarks SLN labels OR-030031and WA-030035.

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. Preharvest interval is 30 days.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

flumioxazin (Chateau, Warfox)

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

Time Apply in early spring before weed emergence and fruit set.

Remarks Apply only to row middles using a hooded or shielded sprayer. May give some burnback of existing broadleaf weeds. Adding an adjuvant enhances weed burnback but may lead to crop spotting. Apply only prior to fruit set.

Caution Do not exceed 3 oz/a per application. Do not apply after fruit set. Do not apply over the top of strawberries. Do not let spray drift contact fruit or foliage.

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

Chemical family N-phenylphthalimide

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 winter dormancy prior to onset of new seasonal growth from crowns, or in spring as a band between rows.

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