clopyralid (Stinger)
Washington: Broccoli, cauliflower, and cabbage seed
Oregon: Broccoli, broccoli raab, Brussels sprout, cabbage, cauliflower, Chinese broccoli
Rate 0.094 to 0.125 lb ae/A (0.25 to 0.33 pint/A) in Washington; maximum rate in Oregon is 0.188 lb ae/A (0.5 pints/A)
Time Apply in 10 gal or more total spray volume when seed crop has at least two true leaves. Spot applications up to 0.66 pint/A may be applied to Canada thistle. Apply after most thistle basal leaves emerge but before buds form.
Remarks SLN labels OR-090018 and WA-970033. Use for annual weeds 1 to 2 inches high. Re-treat as necessary up to eight-leaf stage of crop growth; do not exceed 0.66 pint/A Stinger per growing season. Crop safety data are limited; use only where crop injury is acceptable. Follow rotational crop restrictions on label. Avoid spray drift to sensitive crops.
Caution Do not apply with other herbicides that are emulsifiable concentrates, or oil-based adjuvants, particularly during heat-stressed periods. Extreme growing conditions such as drought or near freezing temperatures prior to, at, and following time of application may increase the risk of crop injury. See label for crops allowed. Do not use any part of treated field, including seed, seed screenings, hay forage, or stubble for human or animal consumption.
Site of action Group 4: synthetic auxin
Chemical family Pyridine
fluazifop (Fusilade DX) ok
Washington only-cabbage, kale, and Chinese cabbage seed
Rate 0.063 to 0.25 lb ai/A (4 to 16 fl oz/A Fusilade DX)
Time Apply to actively growing grasses.
Remarks SLN label WA-040006. Identify grasses and adjust rates for susceptibility and stage of weed growth as label instructs. Control often is erratic on grasses stunted or stressed by drought, heat, or low fertility. More mature grasses and quackgrass can be controlled but may require two applications. Annual bluegrass and all fine fescues resist treatment.
Caution Do not exceed 32 oz/A per season. Do not apply if rain is expected within 1 hr. Do not plant rotational grass crops such as corn and cereals within 60 days of the last application. Grazing any plant product or residue is prohibited.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxypropionate
quizalofop (Assure II)
Chinese cabbage seed only
Rate 0.069 to 0.17 lb ai/A (5 to 12 oz/A Assure II)
Time Apply at optimum growth stage listed on label.
Remarks Identify susceptible grasses and add 4 quarts crop oil concentrate or 1 quart nonionic surfactant/100 gal spray mix. Grass control may be reduced if applied immediately before or after applying a broadleaf herbicide.
Caution Do not apply within 14 days of flowering. Do not mix with or apply with any other pesticide except as specified on label. Do not apply to plants stressed from lack of moisture, cold, or injury from herbicides, insects, or disease. Do not use any treated portion of crop for food or feed. Do not exceed 25 fl oz/A per season.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxypropionate
diquat (Reglone)
see Preharvest Desiccation at end of this section
simazine (Simazine 4L)
Washington- Brussels sprout, cabbage, and cauliflower seed
Oregon-broccoli, Brussels sprout, cabbage, Chinese cabbage, Chinese mustard, kale, kohlrabi, rutabaga, and turnip
Rate 0.8 to 1 lb ai/A (1.6 to 2 pints/A Simazine)
Time Apply in fall after radish plants are well established and after winter rains begin, but before most winter weeds emerge. A second application can be made in the spring just after the last cultivation.
Remarks SLN labels WA-900005, WA-090016 and OR-090014. Use a minimum of 20 gal of spray solution with ground equipment per acre. For best results, field will have been cultivated one or more times and be relatively weed-free at time of treatment. Irrigation is not required to activate the herbicide if adequate rainfall is received.
Caution Restricted-use herbicide in Washington to protect surface and groundwater. Do not use on sandy, loamy, or gravelly areas of fields, or where water pools. Avoid crop rotations to susceptible crops. Do not use crop, crop residues, or seed screenings for food or feed. Do not apply through any type of irrigation system.
Site of action Group 5: photosystem II inhibitor
Chemical family Triazine