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.
- glyphosate (Roundup Power Max): PHI 7d, REI 4h, Group 9.
- pelargonic acid (Scythe): PHI 1d, REI 12h, Group 0.
Preemergent Herbicides (before weeds germinate)
- bensulide (Prefar 4E): REI 12h, Group 0. For parsley only. Apply 5-6 qt/A per application, only 1 application allowed per year. Apply before planting to soil relatively free of plant debris. Incorporate 1-2” into the soil within 36 hours by shallow cultivation or with water through irrigation or rainfall. Grass control only; should be supplemented with cultivation or another registered herbicide for broadleaf control.
Pre- and Postemergent Herbicides
linuron (Lorox DF): PHI 30d for parsley, 21d for cilantro, 155d coriander seed, REI 24h or 8d, Group 5. For parsley, apply 1-3 lbs/A per application. Can be applied as a single broadcast application of 1-3 lbs/A after planting, but before the crop emerges. Do not exceed 3 lb/A per year if applying before crop emerges. Can also be applied as a single application of 1 lb/A after parsley has a minimum of 3 true leaves or crop injury may result. Apply when weeds are in the 1-3 true leaf stage. Do not exceed 1 lbs/A per year if applying after the crop emerges. Only apply after the crop emerges if growing in muck soil.
For cilantro, apply 1-2 lbs/A per application. Do not exceed a total of 4 lb/A per year. Can be applied as a single broadcast application of 1-2 lb/A after planting, but before the crop emerges. Plant seeds at least 0.5” deep. Use the lower rate on sandy soils and the higher rate on silt and clay soils. Can also be applied after the crop emerges using of 1-2 lb/A per application. Up to 2 applications allowed per year, a minimum of 14 days apart. Do not exceed the seasonal maximum of 4 lbs/A per year in total (with applications before and after the crop emerges). Apply after cilantro has a minimum of 3 true leaves and weeds are in the 1-3 true leaf stage. Early crop injury can occur, however the effect should be transitory, with no yield losses attributable to crop injury.
Has not been tested on all varieties, crop tolerance should be verified before treating the entire field. Moisture is needed to activate Lorox, best results are obtained when application is made to moist soil (applied after at least 0.5” of water through rain or irrigation. Do not exceed 40 psi spray nozzel pressure or apply when the temperature is over 85F. Lorox activity is higher if it has been cloudy for 3 or more days, so reduce the application rate if these conditions are met.
prometryn (Caparol 4L): PHI 30d, REI 12h or 48h, Group 5. For cilantro, apply 2-3.2 pts/A per application. Do not exceed 3.2 lbs/A per crop cycle or 6.4 lbs/A per year. Apply as a broadcast application before planting or after seeding, but before crop has emerged.
For parsley, apply 1 pt/A per application, up to 3 applications allowed per year. Do not exceed 3 pts/A per year. Can be applied as a broadcast application up to 14 days after planting. Can also be applied up to 30 days prior to harvest and again up to 30 days prior to the second cutting/harvest.
Use the lower rate on sandy soils and the higher rate on silt and clay soils. To avoid crop injury, do not use on sand or loamy sand soils, or if crop is under water stress.
Postemergent Herbicides (after weeds germinate)
- carfentrazone-ethyl (Aim EC): PHI 0d, REI 12h, Group 14. Apply 0.5-2 oz/A per application, multiple applications allowed per year. Do not exceed 6.1 oz/A per year. Apply as a hooded application, as a preplant burndown no later than 7 day before planting by seed or immediately before transplanting crops.
- 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.
- clomazone (Command 3ME): PHI 50d, REI 12h, Group 13. For dried parsley and fresh cilantro only. Apply 10.7 oz/A per application, only 1 application per year. Apply after seeing but before crop has emerged to the soil in a minimum of 10 gal/A of spray. Has not been tested extensively in our region, tolerance should be verified before treating the entire field.
- glyphosate (Roundup Power Max): PHI 7d for cilantro and dried parsley, 14d for fresh parsley, 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. 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.
- 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 15d, 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.