clethodim (Select Max, Section Three)
Rate For tomatoes, 0.068 to 0.25 lb ai/A (9 to 32 oz/A Select Max); for peppers and eggplants, 0.068 to 0.121 lb ai/A (9 to 16 oz/A Select Max). Dependent on weed growth stage.
Time Apply to actively growing grass weeds, including annual bluegrass, at growth stage as on label.
Remarks Do not apply more than 64 oz/A per year. Use NIS at 0.925% v/v. Preharvest interval is 20 days.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Cyclohexanedione
halosulfuron (Sandea)
Rate 0.023 to 0.047 lb ai/A (0.5 to 1 oz/A)
Time Tomatoes: Apply broadcast to actively growing transplanted tomatoes with four leaves or more, 14 days or more after transplanting, but before first bloom. May also be used as spot treatment when weeds have broken through plastic mulch.
Eggplant and pepper: apply to row middles or furrows only, avoiding herbicide contact with the planted crop.
Remarks Repeat application may be required to control nightshade species, but do not exceed 2 applications (2 oz/A Sandea) per year.
Caution Observe crop rotation restrictions carefully: time interval before planting Brassica crops is 18 months, spinach is 24 months, and beets 36 months.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
metribuzin (Tricor 4F)
Tomatoes only, must be established
Rate 0.25 to 0.5 lb ai/A (0.5 to 1 pint/A)
Time Apply postemergence as a single treatment or a split application, with at least a 14-day interval, to tomatoes with at least five to six true leaves, but before weeds are 1 inch tall.
Remarks Use lower rates on soils with 0.5% to 2% organic matter, but do not use on soils with less than 0.5% organic matter. Up to 2 pints/A can be applied if application is directed and spray does not contact foliage. Inhibits photosynthesis.
Caution Do not use surfactant or tank mix with other pesticides. Do not apply within 24 hours of other pesticide applications. Preharvest interval is 7 days. Do not apply within 3 days after cool, wet, or cloudy weather. Do not exceed 1 lb ai/A per season. Carefully note other precautions on label. Does not control nightshade or other related weeds
Site of action Group 5: photosystem II inhibitor
Chemical family Triazinone
paraquat (Gramoxone, 2 lb paraquat cation/gal)
Rate Preplant and preemergence: 0.5 to 1 lb ai/A cation (2 to 4 pints/A Inteon). Postemergence directed: 0.5 lb ai/A cation (2 pints/A Inteon).
Time Apply as a directed spray between rows after crop is established, but before emerged weeds reach 6 inches tall.
Remarks Do not exceed three applications per season. Preharvest interval is 30 days. Do not graze animals.
Caution A restricted-use herbicide due to acute toxicity. Do not ingest or inhale spray mist. Applicators must wear long-sleeve shirt and long pants, shoes plus socks, protective eyewear, chemical-resistant gloves, and a NIOSH-approved particulate respirator or approved powered air-purifying mask.
Site of action Group 22: photosystem I electron diversion
Chemical family Bipyridilium
rimsulfuron (Matrix)
Tomatoes only, direct seeded and transplanted
Rate 0.031 to 0.062 lb ai/A (2 to 4 oz/A) preemergence, 0.156 to 0.062 lb ai/A (1 to 2 oz/A) postemergence
Time Apply when weeds are less than 1 inch tall or wide and crop is at the cotyledon stage.
Remarks Use a nonionic surfactant at 0.25% v/v. Sequential applications 7 to 14 days apart may improve black nightshade control. Tomato varieties may differ in tolerance to rimsulfuron; apply to a small test area before treating whole fields.
Caution Using adjuvants at more than 0.25% v/v may result in temporary chlorosis. Consult labels for rotational intervals. Preharvest interval is 45 days.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
sethoxydim (Poast)
Rate 0.28 lb ai/A (1.5 pints/A)
Time Apply at optimum growth stage listed on the 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, high heat, or low fertility. Resistant grasses include annual bluegrass and all fine fescues; quackgrass can be suppressed.
Caution Preharvest interval is 20 days. Do not exceed 4.5 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