Postemergence to nondormant rhubarb

clethodim (Select Max)

Oregon and Washington only

Rate 0.068 to 0.121 lb ai/a (9 to 16 oz/a). Use higher rate for perennial grasses.

Time Apply to actively growing grass weeds, including annual bluegrass, at growth stages on label.

Remarks Read label carefully for adjuvant instructions; note effects of rain within 1 hour of applying other pesticides and of cultivation. Wait 14 days to repeat application with no more than 64 oz/a per year.

Caution See label for maximum rates per application and season. Preharvest interval is 30 days.

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

Chemical family Cyclohexanedione

quinclorac (QuinStar 4L)

Oregon and Washington only

Rate Up to 0.374 lb ai/a (up to 12.6 fl oz/a QuinStar 4L)

Time Fall or spring as a foliar application to control field bindweed and hedge bindweed.

Remarks Works best for bindweed control if applied in the fall before a killing frost or in the spring just as bindweed begins to emerge from the soil. Apply in a minimum of 10 gal/a water at 20 to 30 psi. Bindweed plants must be actively growing and shoots at least 8 inches long. Wait 30 days if the soil was tilled. Crop oil concentrate at 2 pints/a should be added to the mix. Controls or suppresses crabgrass, barnyardgrass, dandelion, prickly lettuce, sowthistle, clover, and lambsquarters. Preharvest interval is 30 days.

Caution Do not allow drift onto sensitive crops. Will injure sensitive crops including, but not limited to, tomato, pepper, eggplant, carrot, and green bean. Do not allow livestock to graze. Do not exceed 0.75 lb ai/a (25.2 fl oz/a QuinStar) per year. Crop rotation restrictions may be important when rotating out of rhubarb: Wait 24 months before planting alfalfa, clover, dry beans, flax, peas, lentils, safflower, Solanaceous family crops or sugarbeets,

Site of action Group 4: synthetic auxin

Chemical family Quinoline carboxylic acid

sethoxydim (Poast)

Rate 0.28 lb ai/a (1.5 pints/a)

Time Apply at optimum growth stage listed on label.

Remarks Identify susceptible grasses and add 2 pints/a nonphytotoxic crop oil concentrate to improve leaf absorption. Control often is erratic on grasses stunted or stressed from drought, heat, or low fertility. Resistant grasses include annual bluegrass and all fine fescues, but quackgrass can be suppressed.

Caution Do not mix or apply with any other pesticide, additive, or fertilizer except as specified on label. Preharvest interval is 30 days. Do not exceed 3 pints/a per season. Inhibits fatty acid production, cell membranes, and new growth.

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

Chemical family Cyclohexanedione

Tomato, Pepper, and Eggplant

Ed Peachey

Revised March 2021

These three crops are members of the Solanaceae family, and can be either direct-seeded or planted as transplants. Although these crops are closely related, some herbicides are registered for use in one crop but not the others. For example, "Tomatoes only, must be established" means that particular herbicide is registered only for use on tomatoes, and only if the plants are beyond the 5- to 6-leaf stage. Always consult the label for rate and timing specifics.