NOTES: For the herbicides listed below, one product trade name and formulation is provided for each active ingredient along with preharvest interval (PHI), restricted entry interval (REI), resistance management group number, and example of rates and special instructions. In many cases, there are other products available with the same active ingredient. However, not all products with the same active ingredient are registered for use in a crop. Always check the product label to be sure that the crop is listed before using.
Stale Seedbed
See Stale Seedbed Technique for information on the use of these herbicides or flaming.
- carfentrazone (Aim EC): PHI 0d, REI 12h, Group 14.
- glyphosate (Roundup Power Max): PHI 14d, REI 4h, Group 9.
- paraquat (Gramoxone SL 2.0*): restricted use. REI 12h or 24h, Group 22.
- pelargonic acid (Scythe): PHI 1d, REI 12h, Group 0.
Preemergent Herbicides (before weeds germinate)
- bensulide (Prefar 4E): REI 12h, Group 0. Apply 5-6 qt/A per application. Can be applied before or after planting, but before crops emerge. Incorporate weed growth and crop stubble thoroughly into the soil prior to application. Within 36 hours of application, incorporate 1-2” with shallow cultivation or water through irrigation or rainfall.
- napropamide (Devrinol 2-XT): REI 24h, Group 0. Apply 2-4 qt/A per application, only 1 application per year. Can only be applied to transplants before planting. Use the lower rate on sandy soils and the higher rate on silt and clay soils. Incorporate 2-4” into the soil with shallow cultivation or water through irrigation or rainfall within 24 hours of application. If using plastic mulch irrigate with sufficient water to wet to a depth of 2-4” if soil is dry, incorporate into the soil, and then lay mulch on the same day as application.
- pendimethalin (Prowl H2O): PHI 70d, REI 24h, Group 3. Apply 1-3 pt/A per application. Rate based on soil texture. Can be applied broadcast before transplanting or as a directed spray after transplanting. Do not apply before direct-seeding. Can be applied to transplanted raised beds just before laying plastic. May also be applied in a band to previously untreated row middles between the transplanted beds but be sure not to overlap row and row-middle spray. Incorporate into the soil or leave on the soil surface. Treated soil falling into the transplant hole may delay crop growth. Can be used under plastic mulch. Can also be applied after transplanting once the roots are established as a directed spray on the soil at the base of the plant, beneath plants, and between rows. Avoid direct contact with foliage or stems or injury will occur. Mechanically incorporate at blocking, thinning, or layby if sufficient rainfall or irrigation has not occurred.
- sulfentrazone (Aquesta 4F): REI 12h, Group 14. Apply 2.25-12 oz/A per application, only 1 application per year. Rate based on soil texture, organic matter and soil pH. Apply banded or broadcast before transplanting.
- trifluaralin (Treflan 4E): REI 12h, Group 3. Apply 1-1.5 pts/A per application. Apply to transplanted eggplant only. Can be applied and incorporated before or after transplanting, using a directed sprayer between rows and beneath plants. Rate based on soil texture, percent organic matter, and rainfall. Has not been tested on all varieties, crop tolerance should be verified before treating the entire field.
Postemergent Herbicides (after weeds germinate)
- carfentrazone (Aim EC): PHI 0d, REI 12h, Group 14. Apply up to 2 oz/A per application, multiple applications allowed per year. Do not exceed 6.1 oz/A per year. Can be applied as a preplant burndown no later than 7 days before seeding. Can also be applied to row middles of emerged crops with hooded sprayers to control emerged weeds, including crops grown on mulch or plastic. Prevent any spray from contacting the crop, or injury will occur. For best results, make application to actively growing weeds up to 4” tall and rosettes less than 3” across.
- clethodim (Select Max): PHI 20d, REI 24h, Group 1. Apply 9-16 oz/A per application, up to 4 applications allowed per year, a minimum of 14 days apart. Do not exceed 64 oz/A per year. Apply to actively growing grasses. Add 0.25% v:v nonionic surfactant (1 qt/100 gal of spray). Can also be applied as a spot-spray by mixing 0.33-0.66% (0.44-0.85 oz/gal) Select Max and 0.25% v:v nonionic surfactant (0.33 oz/gal). Spray to wet, but do not allow runoff of spray solution.
- glyphosate (Roundup Power Max): PHI 14d, REI 4h, Group 9. Apply 10 oz to 3.1 qts/A per application, multiple applications allowed per year. Do not exceed 5 qts/A per year. Rate based on target weed species. Can be applied during fallow intervals, prior to planting or transplanting, at planting, or before crop has emerged. Allow a minimum of 3 days between application and seeding and do not apply after seeding. Could cause injury when applied prior to transplanting or direct-seeding into plastic mulch. Remove residual product from plastic mulch with a 0.5” of water through irrigation or rainfall prior to planting.
- halosulfuron (Sandea): PHI 30d, REI 12h, Group 2. Apply 0.5-1 oz/A per application, multiple applications allowed per year. Do not exceed 2 oz/A per year. Can be applied to row middles/furrows of direct seeded and transplanted eggplant as a banded shielded application while avoiding contact with the crop. If plastic is used on the planted row, adjust equipment to keep the application off the plastic. It is recommended to add 0.25% v:v nonionic surfactant (1 qt/100 gal of spray) to the spray solution for applications where susceptible weeds are present.
- paraquat (Gramoxone SL 2.0*): restricted use. REI 12h or 24h, Group 22. Apply 1.3-2.7 pts/A per application, up to 3 applications allowed per year, a minimum of 14 days apart. Do not exceed 8 pts/A per year. Can be applied before, during, or after planting but before emergence. Can also be applied after the crop has emerged with a directed spray. Apply in a minimum of 10 gal/A of spray. May be fatal if swallowed or inhaled. Applicators must complete an EPA-approved paraquat training listed on the following website https://www.epa.gov/pesticide-worker-safety/paraquat-dichloride-training.... The training must be completed a minimum of every three years.
- pelargonic acid (Scythe): PHI 1d, REI 12h, Group 0. Apply a 3-10% solution (3-10 gallons per 100 gallons of spray). Apply in 75-200 gal/A of spray. Can use preplant, or as a directed and shielded spray during crop growth. Avoid contact with foliage or crop damage may occur. Spray to wet, but do not allow runoff of spray solution.
- sethoxydim (Poast): PHI 20d, REI 12h, Group 1. Apply up to 1.5 pt/A per application, multiple applications allowed per year, a minimum of 14 days apart. Do not exceed 3 pts/A per year. Apply to actively growing grasses. Use with crop oil concentrate (2 pt/A) or methylated seed oil (1.5 pt/A). Note that crop oil can cause injury under hot and humid conditions. Can also be applied as a spot-spray by mixing 1-1.5% (1.3-1.9 oz/gal) Poast and 1% v:v crop oil concentrate (1.3 oz/gal). Spray to wet, but do not allow runoff of spray solution.