Mint
Bob Parker
Revised October 31, 2008
MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop
•  terbacil (Sinbar)
Rate  0.8 to 1.6 lb ai/A applied preemergence to mint or 0.8 to 1.2 lb ai/A plus recommended surfactant or nonphytotoxic spray oil applied postemergence to small, actively growing weeds
Time  West of Cascades, apply before crop emerges in spring or in fall after last cultivation. East of Cascades, apply before emergence any time after the first settling rain in fall. Make postemergence applications before broadleaf weeds are 2 inches tall or across and grasses are 1 inch tall or across. If not applied preemergence, two postemergence treatments may be made.
Remarks  Almost all spring terbacil application failures are from inadequate moisture to activate the chemical when weeds are germinating and growing. If moisture is inadequate to activate the chemical, irrigation must follow fall or winter treatment as soon as soil thaws in spring (or promptly after spring treatment). On soils with good subsurface moisture, best results are by applying 0.75 to 1 inch of overhead moisture before weeds are more than 1 inch high. If subsoil is dry or if weeds have germinated and their roots penetrate deeply into the soil, 1.5 to 3 inches of irrigation may be required. For furrow-irrigated or rill-irrigated mint, take care to thoroughly wet across the entire bed after applying, or weed control may be poor. Control under those conditions may improve by applying in fall for activation by winter rain or by incorporating terbacil in top 1 inch of soil during final bed preparation before crop emerges in spring. This is especially true if spring rain is erratic or inadequate to activate terbacil. For fall application west of Cascades, apply early before weeds emerge. Results have been poor after weeds such as groundsel and prickly lettuce develop a taproot. For postemergence application, apply before broadleaf weeds are 2 inches tall or across and before grasses are 1 inch tall or across. Add 0.5 to 1 pint of surfactant per 25 gal of spray mixture, 1 gal/A of nonphytotoxic superior-type spray oil, or 1 quart/A of surfactant–oil mixture (such as Herbimax or MorAct). Two applications of terbacil (preemergence + postemergence or postemergence + postemergence) may be made within 1 yr, but the total applied should not exceed 1.6 lb ai/A in any 1 yr. This treatment will not control green foxtail.
Caution  Do not apply within 60 days of harvest. Unless otherwise directed, do not use on sand, loamy sand, or gravelly soils or on soils with less than 1% organic matter. If used on soils with these conditions, limit use to a small area to determine crop response prior to treating larger areas. Do not exceed 1.6 lb ai/A total per season. Residues can persist after mint plow-out and injure later crops. Do not replant treated areas to any other crop within 2 yr after last terbacil application. Deep plowing (10 to 12 inches) helps reduce injury from carryover. Mint sometimes has been injured when terbacil was applied before, with, or after certain insecticides, especially organophosphates such as Dyfonate. Injury usually has been with applications less than 3 wk apart. Injury has been especially severe on new stands or on mint emerging from shallow, weak roots and particularly on sandy or gravelly soils. To minimize the possibility of injury, follow the labels of both products carefully. Avoid closely timed applications, especially to weak mint on coarse soils. Mint stressed by double cutting, drought, high salt content of soils, insects, diseases, or other factors may be injured.
Site of action  Group 5: photosystem II inhibitor
Chemical family  Uracil
•  sulfentrazone (Spartan 4F)
Rate  0.14 to 0.375 lb ai/A (4.5 to 12 fl oz/A product)
Time  Apply to dormant mint in spring after any cultivation and before new growth emerges, or postharvest in fall or winter after any cultivation when mint is dormant. Split applications may be used for preemergence sequential control of winter annual and summer annual weeds. May be applied to new mint plantings before weeds emergence and mint begins growth.
Remarks  Adjust rate for soil type and soil pH. Will not adequately control most grasses. In new plantings, reduce application rate 25% from the rate for established plantings with the particular soil characteristics. Apply with a registered burndown herbicide to control weeds emerged at application. A surfactant is recommended with these tank-mixes to increase control of emerged weeds. Overhead moisture required after application to activate the herbicide. Some foliage may be discolored temporarily. May be tank-mixed with other labeled herbicides to broaden weed control spectrum.
Caution  Applications to stressed mint may injure crop. Applications to emerged mint will severely injure exposed plant tissue. Do not cultivate after applying. Do not exceed 0.375 lb ai/A in a 12-mo period. Do not mix with fertilizers. Note recropping restrictions on the label.
Site of action  Group 14: protoporphyrinogen oxidase inhibitor
Chemical family  Triazinone

• sulfentrazone + glyphosate (Spartan Advance) 
Rate  1.15 to 3.06 lb ai/A (32 to 85 fl oz/A Spartan Advance) 
Time  Apply preemerge to new mint plantings. 
Remarks  Consult label to determine rate for soil pH, percentage of organic matter, and texture. 
Caution  Do not exceed 3.105 lb ai (86.4 fl oz) Spartan Advance per 12-mo period. Applications made to mint that has emerged will result in severe injury to exposed plant tissue. Do not apply on sand soils with less than 1% organic matter. Preharvest interval is 92 days.
Site of action  (sulfentrazone) Group 14: protoporphyrinogen oxidase inhibitor; (glyphosate) Group 9: inhibits EPSP synthase 
Chemical family  (sulfentrazone) triazinone; (glyphosate) none generally accepted

MINT—Annual Grass and Broadleaf Weeds in Established Crop
•  diuron (Karmex XP or Direx 4L)
Rate  0.6 to 2.4 lb ai/A
Time  Apply to mint during late-winter dormant period or after flaming in spring before new growth emerges.
Remarks  Soil organic matter determines application rate. Treatments to growing mint often injure crop. Diuron works best applied to moist soils and followed by 0.5 to 1 inch of rain or overhead irrigation to move herbicide into the weed root zone before weeds germinate. If weeds are present at time of application, a surfactant at 0.25% v/v or a crop oil concentrate at 1% v/v may enhance control. Weeds larger than 2 inches tall or across at time of treatment may not be controlled. May be tank-mixed with other herbicides provided mixture is not applied to actively growing mint. Tank-mixes and sequential treatments with other herbicides can increase the risk of crop injury. Use lower rate of diuron unless experience indicates it is safe to use higher rates.
Caution  Do not use on sand, loamy sand, gravelly soils, or exposed subsoils or if soil organic matter is less than 1%. Do not apply to soils that have a high salt content and/or high water table or poor drainage that retards mint root development, resulting in a shallow root system. Do not cultivate after treatment. Do not apply to actively growing mint. Do not apply to mint established less than one growing season in the field or to mint stressed from low fertility, drought, winter injury, insects, disease, or damage from other herbicides or other causes. Do not apply to snow-covered or frozen ground.
Site of action  Group 7: photosystem II inhibitor
Chemical family  Substituted urea
•  paraquat (Gramoxone Max, Firestorm, or Gramoxone Inteon)
Rate  0.49 to 0.75 lb ai/A (1.3 to 2 pints/A Gramoxone Max or Firestorm) or 0.5 to 0.75 lb ai/A (2 to 3 pints/A Gramoxone Inteon) + nonionic surfactant or crop oil concentrate
Time  Apply to dormant mint from November through mid-February.
Remarks  Apply in at least 10 gal/A water by ground or 5 gal/A by air. Always add nonionic surfactant or crop oil concentrate as specified on label. Weeds should be succulent and growing and less than 6 inches tall or across at application. Weeds that germinate after application will not be controlled.
Caution  A restricted-use herbicide.  Do not apply after mint begins spring growth. Mint foliage present at application may be burned. Use a full-face shield, rubber gloves, and apron when handling concentrate. Avoid working in spray mist. Wear waterproof footwear and clothing when spraying or contacting plants wet with spray.
Site of action  Group 22: photosystem I electron diversion
Chemical family  Bipyridilium
•  oxyfluorfen (Goal 2 XL or GoalTender) +
•  paraquat (Gramoxone Max or Gramoxone Inteon)
Rate  0.25 lb ai/A + 0.375 lb ai/A (1 pint Goal 2XL) or 0.5 pint GoalTender + 1 pint/A Gramoxone Max or 1.5 pints/A Gramoxone Inteon
Time  Apply only to established dormant mint after a hard frost or not before early December. Use higher rates for dandelions or weeds over 4 inches tall or wide.
Remarks  This combination is more effective on many weeds than either herbicide alone. Paraquat particularly improves performance on grasses.
Caution  Paraquat is a restricted-use herbicide. See cautions for each herbicide.
Site of action  (oxyfluorfen) Group 14: protoporphyrinogen oxidase inhibitor; (paraquat) Group 22: photosystem I electron diversion
Chemical family  (oxyfluorfen) diphenylether; (paraquat) bipyridilium
•  trifluralin (Trifluralin or Treflan)
Rate  0.5 to 0.75 lb ai/A
Time  Apply to dormant, established peppermint and spearmint.
Remarks  Application rate depends on soil type. Must be soil-incorporated 1 to 2 inches deep with equipment that ensures thorough soil mixing and minimum damage to mint. This treatment will not control mustards, prickly lettuce, horseweed (marestail), salsify, mallow, or nightshade.
Caution  Take care to avoid exposing untreated soil when ditching for rill irrigation. Do not plant sugar beets, red beets, or spinach for 12 mo after applying. Do not plant corn, sorghum (milo), or oats for 14 mo after applying.
Site of action  Group 3: microtubule assembly inhibitor
Chemical family  Dinitroaniline
•  clomazone (Command 3ME)
Rate  0.5 lb ai/A (1.3 pints/A product)
Time  Apply to soil surface before weeds emerge and mint begins new growth.
Remarks  Will not adequately control most grasses. Only one application per season allowed. Off-site movement of spray drift or vapors of clomazone can whiten or yellow some plants. Before applying, check adjacent properties and avoid spraying within 300 ft of desirable plants. Overhead moisture after application required to move herbicide into soil. Some, usually temporary, mint discoloration may occur when mint emerges. All use is at the user’s and/or grower’s risk; users should review the vegetable disclaimer at the end of the label before using. May be tank-mixed with other labeled herbicides to broaden weed control spectrum.
Caution  Do not apply more than once per season. Preharvest interval is 84 days. Do not exceed 0.5 lb ai/A (1.3 pint/A Command 3ME). Do not allow particle or vapor drift. Note crop restriction intervals on label.
Site of action  Group 13: inhibits DOXP synthase
Chemical family  Isoxazolidinone
•  pendimethalin (Prowl H2O or Pendimax 3.3)
Rate  0.71 to 1.9 lb ai/A (1.5 to 4 pints/A Prowl H2O or 1.7 to 4.6 pints/A Pendimax 3.3). Rate depends on soil texture.
Time  Apply to dormant established peppermint and spearmint before weed seedlings emerge.
Remarks  Apply by ground in 10 to 40 gal/A of water or by air in at least 5 gal/A water. Adequate rain or irrigation after application and before weed seedlings emerge will enhance control.
Caution  Do not apply to mint in first year of growth and establishment. Do not apply if mint has broken dormancy. Mint growing under stress conditions is more susceptible to herbicide damage. Preharvest interval is 90 days. Refer to main labels for crop rotation restrictions. Do not exceed 1.9 lb ai/A per season.
Site of action  Group 3: microtubule assembly inhibitor
Chemical family  Dinitroaniline
•  flumioxazin (Chateau)
Rate  0.128 lb ai/A (4 oz/A product)
Time  Apply to established dormant mint between November 25 and March 1.
Remarks  Use for residual preemergence weed control and to aid postemergence burndown of many annual and perennial weeds where established mint is dormant. To control emerged weeds, tank-mix with paraquat and apply with a nonionic surfactant. A spray-grade nitrogen source (either ammonium sulfate at 2 to 2.5 lb/A or 28 to 32% nitrogen solution at 1 to 2 quarts/A) may be added to increase burndown of emerged weeds. Controls broadleaf weeds better than grasses.
Caution  Applications to nondormant mint may result in unacceptable crop injury. Do not exceed 0.128 lb ai/A (4 oz/A product) in a single application or 0.255 lb ai/A (8 oz/A product) in a single growing season. Do not reapply within 60 days of the first application. Preharvest interval is 80 days. Do not apply to stands established longer than 3 yr. Do not apply south of Ladd Canyon in Union or Baker counties in Oregon. Note crop restriction intervals on label.
Site of action  Group 14: protoporphyrinogen oxidase inhibitor
Chemical family  N-phenylphthalimide
MINT—Annual Grass and Certain Annual Broadleaf Weeds
•  napropamide (Devrinol)
Rate  4 lb ai/A
Time  In furrow-irrigated mint, it is most effective to apply late in the fall to allow winter rain to carry herbicide into soil. In sprinkler-irrigated mint, apply any time before weeds emerge.
Remarks  There is some evidence napropamide breaks down with continued exposure to sun. This can be avoided by rain, sprinkler irrigation, or mechanical incorporation. November through February treatment must be incorporated or irrigated in if no rain falls within 2 wk of application. Treatments other than in November must be incorporated or irrigated in within 24 hr if no rain falls. Results are best if mechanically incorporated within 24 hr after application regardless of time of year applied.
Caution  Napropamide has injured mint that was not rotovated before herbicide application. Will not control emerged weeds. Do not apply to ground that is frozen or heavily covered with leaves or trash.
Site of action  Group 15: inhibits very long chain fatty acid synthesis
Chemical family  Acetamide

 MINT—Annual Broadleaf Weeds
•  oxyfluorfen (Goal or GoalTender)
Rate  0.5 lb ai/A in western Oregon (Willamette Valley). In other areas, use 0.75 to 1.5 lb ai/A.
Time  Apply only to established dormant mint before weeds exceed 2 to 4 inches in diameter or height. West of Cascades, treatments in December through February generally provide best results. In other areas, apply from December through March. Injury can be serious if spring growth has begun before application. Use the higher rates for longer weed control.
Remarks  Add 1 quart/100 gal nonionic surfactant. Nonrotovated mint may be injured; the injury is believed to occur when herbicide contacts roots and rhizomes growing near the soil surface. Apply oxyfluorfen only to strong, healthy mint. Controls annual bluegrass, Italian ryegrass, and wild oat if applied preemergence.
Caution  Do not apply to emerged mint. Do not apply to plowed mint in the Willamette Valley. East of Cascades, do not harrow plowed fields after application. In furrow-irrigated mint, corrugating must be done before application. Do not apply to mint weakened by disease, nematodes, insects, winter injury, high salt, or other factors because severe injury may result. Do not apply to frozen ground.
Site of action  Group 14: protoporphyrinogen oxidase inhibitor
Chemical family  Diphenylether
•  bentazon (Basagran)
Rate  1 to 2 lb ai/A, depending on target weed
Time  Apply postemergence to actively growing weeds.
Remarks  Bentazon acts on contact, so thoroughly cover weeds. Use at least 20 gal/A water and at least 40 psi by ground. For aerial application, use at least 5 gal water/A and a maximum of 40 psi. Add up to 1 quart/A of oil concentrate for ground application and 1 pint/A for aerial application. Results can be unsatisfactory if daytime temperatures do not reach at least 70°F in the week after applying. Good soil moisture is essential.
Caution  Some mint leaves may burn on under certain conditions. Do not apply in unseasonably cold weather or drought. Rain or overhead irrigation within 8 hr may nullify bentazon effectiveness. Do not exceed 4 lb ai/A in one season. Do not mix with any other pesticide or with fertilizer.
Site of action  Group 6: photosystem II inhibitor
Chemical family   Benzothiadiazole
•  bromoxynil (Buctril)
Rate  0.25 to 0.38 lb ai/A
Time  Apply to established mint in early spring using lower rate. In autumn, there is more crop safety and applications can be made to spring-planted or established mint. Do not apply within 2 wk of a Sinbar application.
Remarks  Crop injury may be unacceptable if applied when temperature is expected to exceed 70°F during the 5 days after treatment. Injury is less likely in fall. Do not exceed 6 pints/A in a single growing season. For best results, treat when weeds have fewer than four leaves or when rosettes are less than 1.5 inches across. Use multiple applications if needed, but do not exceed 1.5 lb ai/A per growing season. Use 10 to 20 gal/A water in ground applications or 5 to 10 gal/A water by air.
Caution  Preharvest interval is 70 days. May stunt or discolor  mint. Do not apply to mint growing under adverse conditions such as disease, insects, high salt, drought, or excessive moisture. Applications to mint growing under cool, cloudy weather and favorable moisture conditions, followed by hot conditions, may cause leaf burn and can stunt mint. Do not tank-mix with terbacil when mint is actively growing or crop may be injured.
Site of action  Group 6: photosystem II inhibitor
Chemical family  Nitrile
MINT—Annual and Perennial Broadleaf Weeds
•  clopyralid (Stinger, Clopyr Ag)
Rate  Fall treatment, annuals—use 0.19 lb ae/A (0.5 pint/A product); fall treatment, perennials—use.25 lb ae/A (0.66 pint/A product); hard-to-kill perennials—use 0.375 lb ae/A (1 pint/A product); spring treatment, annuals—use 0.124 lb ae/A (0.33 pint/A product); spring treatment, perennials—use 0.19 lb ae/A (0.5 pint/A product); fall plus spring treatment, maximum—use 0.66 pint/A product in fall plus 0.33 pint/A product in spring.
Time  Treat small, actively growing annual weeds. For Canada thistle, apply after most basal leaves emerge but before bud stage. Fall application on winter annuals and perennials often is more effective than spring application. For difficult-to-control perennials such as Canada thistle and dandelion, a follow-up application in spring may be needed. Applying after the first fall frost usually results in reduced control.
Remarks  A nonionic surfactant of at least 80% ai may be added at 1 pint/100 gal spray solution. Do not apply within 45 days of harvest. Most weeds in the family Compositae or Asteraceae, such as mayweed (dog fennel), groundsel, dandelion, and salsify, and in the legume family, such as vetch and clover, are susceptible to clopyralid. Will not control broadleaf weeds such as mustards, henbit, chickweed, kochia, lambsquarters, pigweed, Russian thistle, and bindweed.
Caution  Use treated mint for distillation only. Do not feed spent mint hay to livestock. Consult label for crop rotation restrictions. Mint straw, hay, or spent hay from treated areas cannot be used for composting or mulching on ground where susceptible crops may grow the next season.
Site of action  Group 4: synthetic auxin
Chemical family  Pyridine
•  glyphosate
Rate  33% solution (1 gal Roundup Ultra in 2 gal water) in rope or sponge wick applicators or a 33% to 100% glyphosate solution in porous-plastic applicators
Time  Apply to actively growing weeds that are at least 6 inches taller than the mint.
Remarks  Not all glyphosate formulations have this use on the label. Wiper applicator contact point with weed foliage should be at least 2 inches above crop. Weeds should be at least 6 inches taller than crop. Results improve by making two applications in opposite directions. Operate at no more than 5 mph. Do not apply to wet weeds.
Caution  Contact with herbicide solution, whether by dripping from the applicator or inadvertently wiping the mint, will damage or kill the mint plants contacted. Allow at least 7 days between application and harvest. Sequential application may be made to the same area at 30-day intervals.
Site of action  Group 9: inhibits EPSP synthase
Chemical family  None generally accepted
•  glyphosate
Rate  1% to 2% solution
Time  Apply to actively growing weeds.
Remarks  Not all glyphosate formulations have mint on the label. Application rate and timing depend on target weeds. Apply as a spot treatment only, to no more than 10% of any acre. Can reapply in the same area at 30-day intervals.
Caution  The crop sprayed will be killed. Avoid any drift outside spayed area, or those plants could be killed or injured. Allow at least 7 days between application and harvest.
Site of action  Group 9: inhibits EPSP synthase
Chemical family  None generally accepted
MINT—Annual and Perennial Grass Weeds
•  sethoxydim (Poast)
Rate  0.28 to 0.47 lb ai/A
Time  Apply to actively growing annual or perennial grasses at growth stage indicated on label.
Remarks  For grass control only. Refer to label for specific herbicide rates, weed species, and weed sizes. Always add a nonphytotoxic crop oil concentrate to the spray tank at 2 pints/A or Dash HC at 1 pint/A. Sethoxydim is most effective on actively growing grasses before they have been cut and before they reach the maximum size indicated on the label. Larger, more mature grasses can often be controlled but two applications may be required. Sethoxydim will not control annual bluegrass or any of the fine fescues and is weak on downy brome and quackgrass.
Caution  Control may be erratic on grass stressed by drought, temperature extremes, insect damage, herbicide injury, or other factors Do not apply if rain is expected within 1 hr after applying. Preharvest interval is 20 days. Do not graze treated fields or use spent hay or straw as livestock feed. Do not exceed two applications or 5 pints/A a season. Do not tank-mix except with herbicides listed on the Poast label.
Site of action  Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family  Cyclohexanedione
•  clethodim (Select 2EC, Select Max, Intensity, or Intensity One)
Rate  0.09 to 0.25 lb ai/A (6 to 16 oz/A Select 2EC or Intensity); 0.07 to 0.24 lb ai/A (9 to 32 fl oz/A Select Max or Intensity One)
Time  Apply to actively growing grasses at labeled stage of growth.
Remarks  Controls grass only. Refer to label for specific herbicide rates, weed species, and weed size. Use crop oil concentrate at 1 gal/100 gal spray mix. Most effective on actively growing grasses. Larger, more mature grasses often can be controlled but may require two applications. Use the higher rates for perennial grass control.
Caution  Do not exceed 0.5 lb/A (32 oz/A of Select 2EC or 64 fl oz/A of Select Max) per season. When using Select 2EC, do not add nitrogen fertilizer source spray adjuvants to the spray mixture. Preharvest interval is 21 days.
Site of action  Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family  Cyclohexanedione
•  quizalofop (Assure II)
Rate  0.034 to 0.0825 lb ai/A (5 to 12 oz/A product)
Time  Apply to actively growing annual or perennial grasses at appropriate stage of grass growth as indicated on the label.
Remarks  Controls grass only. Refer to label for specific herbicide rates, weed species, and weed size. Always add a crop oil concentrate at 1 gal/100 gal spray mix. Most effective on actively growing grasses; larger, more mature grasses can often be controlled but two applications may be required. Will not control annual bluegrass or any of the fine fescues.
Caution Preharvest interval is 30 days. Do not exceed two applications or 0.21 lb ai/A (30 oz/A product) per season. Tank-mixes with postemergence broadleaf herbicides have reduced control of most grass species. Do not apply if rain is expected within 1 hr after application. Consult label for crop rotation restrictions.
Site of action  Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family  Aryloxyphenoxy propionate
•  glyphosate
Rate  33% solution (1 gal Roundup Ultra in 2 gal water) in rope or sponge wick applicators, or a 33% to 100% glyphosate solution in porous-plastic applicators
Time  Apply to actively growing weeds that are at least 6 inches taller than the mint.
Remarks  Not all glyphosate formulations have this use in mint on the label. Wiper applicator contact point with the weed foliage should be at least 2 inches above the crop. Weeds should be at least 6 inches taller than the crop. Results may be better with two applications made in opposite directions. Operate at no more than 5 mph. Do not apply to wet weeds.
Caution  Contact with the herbicide solution, whether by applicator drips or inadvertent wiping of the mint, will damage or kill the mint plants contacted. Preharvest interval is 7 days. Sequential application may be made to the same area at 30-day intervals.
Site of action   Group 9: inhibits EPSP synthase
Chemical family   None generally accepted
•  glyphosate
Rate  1% to 2% solution
Time  Apply to actively growing weeds.
Remarks  Not all glyphosate formulations have mint on the label. Rate and timing depend on target weeds. Apply as a spot treatment only, to no more than 10% of any acre. Can reapply in the same area at 30-day intervals.
Caution  The sprayed crop will be killed. Avoid any drift outside of spayed area, or those plants could be killed or injured. Preharvest interval is 7 days.
Site of action  Group 9: inhibits EPSP synthase
Chemical family  None generally accepted
MINT—Canada Thistle, Western Goldenrod, Salsify, Common Groundsel, and Yellow Nutsedge in Established Mint
•  bentazon (Basagran)
Rate  1 to 2 lb ai/A
Time  Apply postemergence to actively growing weeds.
Remarks  Rate depends on target weed. Canada thistle should be at least 8 inches tall, western goldenrod less than 8 inches, salsify 4 to 8 inches, and common groundsel less than 3 inches tall at treatment. Make a second application 7 to 10 days later. Bentazon is effective through contact action; weeds must be thoroughly covered. Use at least 20 gal/A water and at least 40 psi by ground. For aerial application, use at least 5 gal/A water and at least 40 psi. Add up to 1 quart/A of oil concentrate for ground application and 1 pint/A for aerial application. Unsatisfactory results can be expected if daytime temperatures do not reach at least 70°F in the week after application. Good soil moisture is essential.
Caution  Some leaf burning may occur under certain conditions. Avoid applications during drought or unseasonably cold weather. Rain or overhead irrigation within 8 hr may nullify effectiveness of bentazon. Do not exceed 4 lb ai/A in one season. Do not mix with any other pesticide or with fertilizer.
Site of action  Group 6: photosystem II inhibitor
Chemical family  Benzothiadiazole

Herbicide Effectiveness on Weeds in Mint 

Weed Family1	flumioxazin	sethoxydim	quizalofop	clethodim	bromoxynil	sulfentrazone	oxyfluorfen	diuron	terbacil	clomazone	trifluralin	napropamide	clopyralid	bentazon	paraquat	pendimethalin	
Amaranth
Amaranth, Powell  (A)
Amaranthus powellii	
F-G	
P	
P	
P	
G	
F-G	
F-G	
F-G	
F	
F	
G	
G	
P	
F	
G	
F-G	
Pigweed, redroot  (A)
Amaranthus retroflexus	F-G	P	P	P	G	F-G	F-G	F-G	F	F	G	G	P	F	G	F-G	
Pigweed, tumble  (A)
Amaranthus graecizans	—	P	P	P	G	—	G	G	F	—	G	G	P	F	G	F-G	
Borage
Fiddleneck, coast  (A)
Amsinckia intermedia	
—	
P	
P	
P	
G	
—	
—	
G	
—	
—	
P	
G	
—	
G	
—	
—	
Buttercup
Buttercup, celery-leaved  (A)  Ranunculus sceleratus	
—	
P	
P	
P	
—	
—	
—	
—	
F	
—	
P*	
—	
—	
—	
G	
—	
Buttercup, creeping  (P) Ranunculus repens	—	P	P	P	—	—	—	—	P	—	P*	—	—	—	P	—	
Caltrop
Puncturevine  (A)
Tribulus terrestris	
—	
P	
P	
P	
G	
—	
—	
—	
F	
—	
G	
—	
P	
—	
G	
G	
Composite
Catsear, spotted  (P)
Hypochaeris radicata	
—	
P	
P	
P	
—	
—	
G*	
P	
P	
—	
P	
P	
—	
P	
—	
—	
Daisy, oxeye  (P) Chrysanthemum 
 leucanthemum	—	P	P	P	—	—	—	G*	P	—	P	P	—	F	P	—	
Dandelion, common  (P)
Taraxacum officinale	F	P	P	P	—	P	P	F*	P	F	—	P	F-G	G*	P	P	
Devil’s beggarsticks  (A) 
Bidens frondosa	—	P	P	P	—	—	—	G	F	—	P	—	—	—	—	—	
Goldenrod, Canada  (P)
Solidago canadensis	—	P	P	P	—	—	P	P	P	—	P	P	—	—	P	P	
Goldenrod, western  (P)
Solidago occidentalis	—	P	P	P	—	—	P	P	P	—	P	P	—	P	P	P	
Groundsel, common  (A)
Senecio vulgaris	F	P	P	P	F-G	F-G	G	F	F	F	F	F-G	F-G	F-G	G	P	
Horseweed  (A)
Conyza canadensis	F-G	P	P	P	F-G	G	P	F	P	—	P	F	G	F	F	P	
Lettuce, prickly  (A)
Lactuca serriola	F-G	P	P	P	F	F-G	F	G	F	F-G	P	G	G	F	G	P	
Mayweed  (A)
Anthemis cotula	—	P	P	P	G	G	—	G	G	—	P	—	G	F	F	—	
Pineappleweed  (A)
Matricaria matricarioides	—	P	P	P	G	—	—	G	G	—	P	G	G	G	G	—	
Ragwort, tansy (B)
Senecio jacobaea	—	P	P	P	—	—	—	P	P	—	P	P	—	P	P	—	
Salsify, common (B)
Tragopogon porrifolius	—	P	P	P	F*	—	F	P	P	—	P	P	G	P	F	P	
Salsify, meadow (B)
Tragopogon pratensis	—	P	P	P	F	—	F	P	P	—	P	P	G	P	F	P	
Salsify, western (B)
Tragopogon dubius	F	P	P	P	F*	F	F	P	P	F-P	P	P	G	P	F	P	
Sowthistle, annual  (A)
Sonchus oleraceus	G	P	P	P	F-G	—	G	F	G	—	P	G	G	F	F	—	
Sunflower, wild  (A)
Helianthus annuus	—	P	P	P	—	P	—	—	—	—	P	—	G	G	—	—	
Thistle, bull  (B)
Cirsium vulgare	—	P	P	P	—	—	—	G	F	—	P	—	—	—	—	—	
Thistle, Canada  (P)
Cirsium arvense	—	P	P	P	P	P	P	P	P	F	P	P	G	F	P	P	
Figwort
Mullein, common  (B)
Verbascum thapsus	
—	
P	
P	
P	
—	
—	
—	
P	
—	
—	
—	
—	
P	
—	
F	
—	
Speedwell, birdseye  (A) Veronica persica	—	P	P	P	F	—	G	P	F	—	G	—	P	F	G	—	
Speedwell, ivyleaf  (A)
Veronica hederifolia	—	P	P	P	F	—	G	P	F	—	G	—	P	F	G	—	
Toadflax, yellow  (P)
Linaria vulgaris	—	P	P	P	—	—	—	P	P	—	P	P	P	P	P	—	
Geranium
Filaree  (A)
Erodium cicutarium	
—	
P	
P	
P	
G	
—	
G	
F	
G	
—	
F	
G	
—	
—	
F	
—	
Geranium, cutleaf  (A)
Geranium dissectum	—	P	P	P	G	—	G	G	G	—	P	G	—	—	G	—	
Geranium, dovefoot  (A)
Geranium molle	—	P	P	P	G	—	G	G	G	—	P	G	—	—	G	—	
Goosefoot
Kochia  (A)
Kochia scoparia	
G	
P	
P	
P	
G	
G	
F	
F	
G	
G	
G	
P	
P	
G	
G	
G	
Lambsquarters  (A)
Chenopodium album	G	P	P	P	G	G	G	G	G	G	G	G	P	F	G	G	
Orach, red  (A)
Atriplex rosea	—	P	P	P	G	—	G	G	G	—	G	—	P	F	—	—	
Thistle, Russian  (A)
Salsola kali	G	P	P	P	G	G	G	P	F	—	F	P	P	F	G	F	
Gourd
Cucumber, western wild  (P) Marah oreganus	
—	
P	
P	
P	
P	
—	
P	
P	
P	
—	
P	
P	
—	
P	
P	
—	
Grass
Barnyardgrass  (A)
Echinochloa crus-galli	
F	
G	
G	
G	
P	
P	
F	
G	
F	
G	
G	
G	
P	
P	
G	
G	
Bermudagrass  (P)
Cynodon dactylon	—	F	G	G	P	P	P	P	P	—	P	P	P	P	P	P	
Bluegrass, annual  (A-P)
Poa annua	—	P	P	G	P	—	G	G	G	—	G	G	P	P	P	G	
Bluegrass, Canada   (P)
Poa compressa	—	—	—	—	P	—	P	P	P	—	P	P	P	P	F	P	
Bluegrass, Kentucky  (P) 
Poa pratensis	—	F	G	F	P	—	P	P	P	—	P	P	P	P	F	P	
Brome, downy  (A)
Bromus tectorum	—	P	F-G	F-G	P	—	—	P	G	F-G	F	G	P	P	G	F	
Crabgrass, large (A)
Digitaria sanguinalis	F	—	—	—	—	P	—	—	—	G	—	—	—	—	—	—	
Fescue, rattail (A)
Vulpia myuros	—	P	P	P	P	—	G	G	G	—	G	P	P	G	P	—	
Foxtail, green  (A)
Setaria viridis	F	F-G	G	G	P	P	F	F	F	G	G	F	P	P	G	G	
Foxtail, yellow  (A)
Setaria lutescens	—	G	G	G	P	P	F	F	F	G	G	G	P	P	G	G	
Oat, wild  (A)
Avena fatua	—	G	G	G	P	—	F	P	G	—	P	G	P	P	G	G	
Quackgrass  (P)
Elytrigia repens	—	F	G	F-G	P	P	P	P	G	F-G	P	P	P	P	F	P	
Ryegrass, Italian (A-B)
Lolium multiflorum	—	G	G	G	P	—	G	F	F	—	F	F	P	P	G	—	
Ryegrass, perennial  (P)
Lolium perenne	—	G	G	G	P	—	P	P	P	—	P	P	P	P	F	—	
Sandbur  (A)
Cenchrus longispinus	—	G	G	G	P	P	—	F	F	—	G	—	P	P	—	G	
Velvetgrass  (P)
Holcus lanatus	—	F-G	P	F-G	P	—	P	P	G	—	P	P	P	P	F	—	
Wheat, volunteer  (A)
Triticum aestivum	—	G	G	G	P	—	—	P	F	G	P	F	P	P	G	—	
Witchgrass  (A)
Panicum capillare	—	G	G	G	P	—	F	P	G	—	G	G	P	P	G	—	
Horsetail
Horsetail, field  (P)
Equisetum arvense	
—	
P	
P	
P	
P	
—	
—	
P	
P	
—	
P	
P	
P	
P	
P	
P	
Knotweed
Buckwheat, wild  (A)
Polygonum convolvulus	
—	
P	
P	
P	
G	
—	
G	
G	
G	
—	
G	
—	
G	
G	
—	
—	
Dock, broadleaf  (P)
Rumex obtusifolius	—	P	P	P	—	—	—	F**	G**	—	F	—	F	—	—	—	
Knotweed, prostrate  (A)
Polygonum aviculare	—	P	P	P	F	—	G	F	G	—	G	F	F	F	—	—	
Ladysthumb  (A)
Polygonum persicaria	G	P	P	P	G	G	G	F	G	—	G	—	F-G	G	—	—	
Sorrel, red  (P)
Rumex acetosella	—	P	P	P	P	—	—	G**	G**	—	F	—	G	F	—	—	
Legume
Clover, hop  (A)
Trifolium dubium	
—	
P	
P	
P	
—	
—	
G	
—	
—	
—	
—	
—	
G	
P	
—	
P	
Clover, white  (P)
Trifolium repens	P	P	P	P	P	—	G	P	—	—	P	P	G	P	P	P	
Vetch, common  (A)
Vicia sativa	—	P	P	P	F	—	G	P	—	—	P	—	G	P	—	P	
Vetch, hairy  (A)
Vicia villosa	—	P	P	P	F	—	G	P	—	—	P	—	G	P	—	P	
Lily
Garlic, volunteer  (P)
Allium sativum	
—	
P	
P	
P	
P	
—	
P	
P	
F	
—	
P	
P	
P	
P	
G	
—	
Garlic, wild  (P)
Allium vineale	—	P	P	P	P	—	P	P	P	—	P	P	P	P	G	—	
Madder
Bedstraw, catchweed (A) Galium aparine	
—	
P	
P	
P	
F	
—	
G	
P	
P	
—	
F	
—	
P	
F	
P	
P	
Madder, field  (A)
Sherardia arvensis	—	P	P	P	—	—	—	—	—	—	—	—	P	—	—	—	
Mallow
Mallow, common  (A-B) Malva neglecta	
F-G	
P	
P	
P	
F	
F-G	
G	
P	
G	
G	
P	
G	
—	
G	
F	
P	
Mint
Deadnettle, red  (A)
Lamium purpureum	
—	
P	
P	
P	
G	
—	
G	
G	
F	
—	
G	
P	
—	
F	
G	
—	
Henbit  (A)
Lamium amplexicaule	—	P	P	P	G	—	G	G	F	G	G	P	—	F	G	G	
Morningglory
Bindweed, field  (P)
Convolvulus arvensis	
—	
P	
P	
P	
P	
F	
P	
P	
P	
—	
P	
P	
P	
P	
P	
P	
Mustard
Bittercress, little  (A)
Cardamine oligosperma	
—	
P	
P	
P	
G	
—	
G	
G	
G	
—	
P	
G	
P	
—	
G	
P	
Falseflax, smallseed  (A) Camelina microcarpa	—	P	P	P	G	—	—	G	G	—	P	—	—	—	—	—	
Flixweed  (A)
Descurainia sophia	G	P	P	P	F-G	G	G	G	G	—	P	F	P	G	G	P	
Mustard, blue  (A)
Chorispora tenella	—	P	P	P	F-G	—	G	—	P	—	P	—	P	P	P	P	
Mustard, hedge  (A)
Sisymbrium officinale	—	P	P	P	G	F-G	—	G	G	—	P	—	P	—	—	—	
Mustard, tansy  (A)
Descurainia pinnata	—	P	P	P	G	—	G	G	G	—	P	—	P	—	G	—	
Mustard, tumble  (A)
Sisymbrium altissimum	G	P	P	P	G	G	G	G	G	G	P	—	P	—	—	—	
Pepperweed, field  (A)
Lepidium campestre	—	P	P	P	—	—	—	G	G	—	P	—	—	G	G	—	
Pepperweed, yellowflower (A)
Lepidium perfoliatum	—	P	P	P	G	—	G	G	G	—	P	—	—	G	G	—	
Shepherdspurse (A)
Capsella bursa-pastoris	G	P	P	P	F-G	G	G	G	G	—	P	P	P	G	G	—	
Turnip, wild  (A)
Brassica campestris	—	P	P	P	G	—	G	G	G	—	P	P	P	F	G	—	
Nightshade
Nightshade, black  (A)
Solanum nigrum	
G	
P	
P	
P	
G	
G	
G	
G	
G	
—	
P	
—	
G	
P	
—	
F	
Nightshade, cutleaf  (A)
Solenum triflorum	G	P	P	P	G	G	—	G	G	—	P	—	G	—	—	F	
Nightshade, hairy  (A)
Solanum sarrachoides	G	P	P	P	F-G	G	G	G	G	—	P	P	G	G	—	F	
Phlox
Polemonium, annual  (A) Polemonium micranthum	
—	
P	
P	
P	
P	
—	
—	
G	
G	
—	
—	
—	
—	
—	
G	
—	
Pink
Chickweed, common (A) Stellaria media	
G	
P	
P	
P	
P	
—	
F	
G	
G	
—	
G	
G	
P	
G	
G	
—	
Chickweed, jagged  (A)
Holosteum umbellatum	—	P	P	P	P	—	P	G	G	—	G	G	P	—	G	—	
Chickweed, mouseear  (P) Cerastium vulgatum	G	P	P	P	P	—	F	G	G	—	G	G	P	G	G	—	
Chickweed, sticky  (A)
Cerastium viscosum	G	P	P	P	P	—	F	G	G	—	G	G	P	G	G	—	
Primrose
Willowweed, panicle  (A)
Epilobium paniculatum	
—	
P	
P	
P	
—	
—	
—	
G	
G	
—	
—	
P	
—	
—	
G	
—	
Purslane
Minerslettuce  (A)
Montia perfoliata	
—	
P	
P	
P	
F	
—	
—	
G	
G	
—	
F	
P	
—	
—	
G	
—	
Purslane, common  (A)
Portulaca oleracea	—	P	P	P	—	—	G	G	G	G	G	G	—	G	—	G	
Rose
Cinquefoil, silverweed (P) Potentilla anserina	
—	
P	
P	
P	
—	
—	
—	
P	
F	
—	
—	
—	
—	
—	
—	
—	
Ladysmantle, western  (A)  Alchemilla occidentalis	—	P	P	P	—	—	G	G	G	—	—	—	P	—	G	—	
St. Johnswort
St. Johnswort  (P)
Hypericum perforatum	
—	
P	
P	
P	
—	
—	
—	
P	
P	
—	
P	
P	
—	
—	
P	
—	
Sedge
Nutsedge, yellow  (P) 
Cyperus esculentus	
P	
P	
P	
P	
P	
F-G	
P	
P	
G	
—	
P	
P	
P	
F	
G	
P	
Violet
Pansy, field  (P)
Viola arvensis	
—	
P	
P	
P	
P	
—	
—	
P	
P	
—	
P	
—	
P	
P	
P	
P