Table 14.2. Herbicides approved for managing weeds in potato. (continued)
Labels change frequently. Be sure to read a current product label before applying any chemical.
Active ingredient Trade name MOA
lb. a.i./A product/A code Weeds controlled / remarks
*** PREPLANT / PREEMERGENCE ***
Carfentrazone (Aim) 1.9 EW 14 Apply as a preplant burn down for emerged broadleaf weeds. Use crop oil concentrate, methylated seed
oil, or nonionic surfactant at recommended rates. Maximum rate of 0.096 lb. a.i./A per season. No
pretransplant interval.
up to 0.031
(Aim) 2.0 EC
Dimethenamid-p (Outlook) 6 L 15 Apply after planting or drag-off. Consult label for exact rates based on soil texture. In cold wet conditions,
0.56 - 0.84 delayed crop emergence or stunting may occur. PHI 40 days.
EPTC (Eptam) 20 G 8 Broadleaf and grass weeds and nutsedge. Apply preplant or after drag-off. Incorporate mechanically or with
potatoes.
1 15 lb.
Flumioxazin (Chateau) 51 WDG 14 Annual broadleaf weeds. Apply after hilling with a minimum of 2 in. of soil covering the vegetative portion of
0.05 1.5 oz. the potato plant. Should be tank mixed with other herbicides, especially for grass control.
Fomesafen 14 Annual broadleaf and grass weeds. Effectiveness reduced if later cultural practices expose untreated soil.
Can be applied after drag off and before crop emergence. Variety tolerance may vary, test on a small sample
0.25 1.0 pt.
Glyphosate (various formulations) 9 Emerged broadleaf and grass weeds. Apply as a preplant burndown. Consult label for individual product
consult labels directions.
Imazosulfuron (League) 75 WG 2 Broadleaf and grass weeds. Limit of 2 applications per year and no more than 6.4 oz./A per year.
0.19-0.3 4-6.4 oz.
Linuron (Lorox DF) 50 DF 7
0.75 - 1.25 1.5 - 2.5 lb. application followed by rain or irrigation with 2 wk.
(Linex) 4 L
1 - 1.6 pt.
Metribuzin (Tricor DF) 75 DF 5 Annual broadleaf weeds. Apply after drag-off but before crop emergence. Do not incorporate. Use lower
0.25 - 1.0 0.3 - 1.3 lb. rates on sandy soil.
(Boundry) 6.5 EC 5 + 15 Broadleaf and grass weeds. Apply before potato emergence. This includes drag-off. Do not incorporate.
S-metolachlor 1.5 - 2.0 pt.
Paraquat (Gramoxone) 2 SL 22 Emerged broadleaf and grass weeds. Apply as a preplant burndown treatment. Apply up to ground cracking
0.25 - 0.5 1.0 - 2.0 pt. before potatoes have emerged. Use a nonionic surfactant.
(Firestorm) 3 SL
0.7 - 1.3 pt.
Pelargonic acid (Scythe) 4.2 EC 27 Emerged broadleaf and grass weeds. Apply as a preplant burndown treatment. Product is a contact,
nonselective, foliar applied herbicide with no residual control. May be tank mixed with soil residual
compounds.
3 - 10% v/v
Pendimethalin (Prowl H20) 3.8 3 Annual broadleaf and grass weeds. Apply after planting but before potatoes and weeds emerge or after
drag-off. Incorporate with rainfall or mechanically into the top 1-2 in. of soil within 7 days. Do not use on peat
or muck soils.
0.75 1.5 pt.
(ET Herbicide) 0.208 EC 14 Emerged broadleaf weeds. Apply as a preplant burndown treatment.
0.001 - 0.003
Rimsulfuron (Matrix) 25 DF 2 Apply immediately after drag-off. Rainfall or sprinkler irrigation 0.3-1.0 in. required with 5 days after
0.016 - 0.023 1.0 - 1.5 oz. application. Do not exceed 2.0 oz./A per year.
Sulfentrazone (Willowwood sulfentrazone)
4SC
14 Broadleaf and grass weed control. Nutsedge suppression. Do not apply on sands with less than 1% organic
suitable rate for the soil type in your area.
0.09 - 0.14
S-metolachlor (Dual Magnum) 7.62 EC 15 Annual broadleaf and grass weeds. Apply after drag-off before crop and weed emergence. If cool, wet soil
0.95 - 1.9 1.0 - 2.0 pt. conditions occur after application, a delay in maturity and/or reduced yield may occur. PHI 60 days.
3 Broadleaf and grass weeds. Apply after dragoff or prior to crop emergence. Incorporate the herbicide into
0.5 5 lb.
1 pt.
*** POSTEMERGENCE ***
Carfentrazone (Aim) 1.9 EW 14 Emerged broadleaf weeds. Apply as hooded application to row middles only. Use a COC or NIS at
season. PHI 7 days.
up to 0.031
(Aim) 2.0 EC
256 2019 Vegetable Production Handbook of Florida