Stale Seedbed
The following herbicides are nonselective and are used to control weeds that are present in a field prior to planting or before the crop emerges, which is especially useful for the Stale Seedbed Technique (see the Weed Management section for more information).
- glyphosate (Roundup Power Max): PHI 14d, REI 4h, Group 9.
- pelargonic acid (Scythe): PHI 1d, REI 12h, Group 0.
Preemergent Herbicides (before weeds germinate)
HRAC Group 0:
bensulide (Prefar 4E): 5 to 6 qt/A; REI 12h. Parsley only. 1 application per year. Apply prior to planting or prior to crop emergence. Grass control only.
Pre- and Postemergent Herbicides
HRAC Group 5:
linuron (Lorox DF): 1 to 3 lb/A; PHI 30d for parsley, 21d for cilantro, REI 4d to hand set irrigation in celeriac, 24h for all other activity. Broadcast after planting but before crop emerges. For cilantro only, can also be applied up to 2 times after crop has 3 true leaves. Do not apply to cilantro when temperatures exceed 85°F. Effects on cilantro is increased after 3 or more cloudy days. Spray additives are not recommended on cilantro.
prometryn (Caparol 4L): 1 to 3.2 pt/A; PHI 30d, REI 12h. For cilantro, apply as a broadcast application after seeding, but before crop has emerged; do not exceed 3.2 lb/A per crop cycle or 6.4 lb/A per year. For parsley, apply as a broadcast up to 14 days after planting, up to 30 days prior to harvest, and a third application up to 30 days prior to a second harvest; do not exceed 3 pt/A per year.
Postemergent Herbicides (after weeds germinate)
HRAC Group 0:
- pelargonic acid (Scythe): 3% to 10% solution; PHI 1d, REI 12h. Apply preplant, or as a directed and shielded spray during crop growth. Contact with crop will cause damage.
HRAC Group 1:
- clethodim (Select Max): 9 to 16 fl oz/A; PHI 14d, REI 24h. Do not exceed 64 fl oz/A per year. Apply to actively growing grasses.
sethoxydim (Poast): 0.5 to 1.5 pt/A; PHI 15d, REI 12h. Do not exceed 3 pt/A per year. Apply to actively growing grasses. BASF has stopped production and will discontinue the registration at the end of 2027.
HRAC Group 9:
- glyphosate (Roundup Power Max): 10 fl oz to 3.1 qt/A; PHI 14d, REI 4h. Do not exceed 5 qt/A per year. Apply during fallow intervals, prior to planting, at planting, before crop has emerged, or to row middles with a hooded or shielded sprayer or wiper applicator. Spray contact can cause crop death. Spray additive recommendation varies with formulation—see label.
HRAC Group 13:
- clomazone (Command 3ME): 10.7 fl oz/A; PHI 50d, REI 12h. Cilantro only. 1 application per year. Apply after seeding but before crop has emerged. Temporary partial whitening of leaf or stem tissue may occur after crop emergence but should not affect yield.
HRAC Group 14:
- carfentrazone-ethyl (Aim EC): 0.5 to 2 fl oz/A; PHI 0d, REI 12h. Do not exceed 6.1 fl oz/A per year. Apply as a hooded application, or as a preplant burndown no later than 7 days before direct-seeding or 1 day before transplanting.