Mint

MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop

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 emerge 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. Foliage that persists during dormancy may be discolored. Foliage on new growth 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-month period. Do not mix with fertilizers. Note re-cropping restrictions on the label.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family Triazinone

sulfentrazone + glyphosate (Spartan Advance)

New plantings only

Rate 0.14 to 0.37 lb ai/A sulfentrazone + 1.01 to 2.68 lb ai/A glyphosate (32 to 85 fl oz/A Spartan Advance)

Time Apply preemergence to new mint plantings.

Remarks Consult label to determine rate for soil pH, percentage of organic matter, and texture. Use only on new plantings and before crop is emerged. Not for use on established mint.

Caution Do not exceed 3.1 lb ai (85 fl oz) Spartan Advance per 12-month period. Applications made to mint that has emerged will result in severe injury to exposed plant tissue. Do not apply on sandy 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

terbacil (Sinbar WDG)

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 (1 to 2 lb/A Sinbar)

Time West of the Cascades, apply before crop emerges in spring or in fall after last cultivation. East of the 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 result from inadequate moisture to activate the chemical during the time 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 into 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 year, but the total applied should not exceed 1.6 lb ai/A in any 1 year. This treatment will not control green foxtail. Terbacil resistant common lambsquarters and redroot pigweed are present in many fields in the PNW.

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 can injure later crops. Do not replant treated areas to any other crop within 2 years 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 weeks apart. Injury has been especially severe on new stands or on mint emerging from shallow, weak roots, 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

MINT—Annual Grass and Broadleaf Weeds in Established Crop

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

diuron (several trade names)

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 Adjust application rate according to soil organic matter. Treatments applied to growing mint often injure crop. Diuron works best when 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 by 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

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 years. Do not apply south of Ladd Canyon in Union or Baker counties in Oregon. Note crop restriction intervals on label. Refer to Supplemental Label for complete list of restrictions.

Site of action Group 14: protoporphyrinogen oxidase inhibitor

Chemical family N-phenylphthalimide

napropamide (Devrinol 50 DF)

Rate 4 lb ai/A (8 lbs/A product)

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 that napropamide breaks down with continued exposure to sun. This photodecomposition can be minimized by rain, sprinkler irrigation, or mechanical incorporation. November through February treatment must be incorporated or irrigated in if no rain falls within 2 weeks of application. Treatments other than in November must be incorporated or irrigated in within 24 hours if no rain falls. Results are best if mechanically incorporated within 24 hours 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

oxyfluorfen (several trade names) + paraquat (several trade names)

Rate 0.25 lb ai/A + 0.375 lb ai/A (1 pint Goal 2XL) or 0.5 pint GoalTender + 1 pint/A Firestorm 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 more than 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. In the Willamette Valley, do not apply oxyfluorfen to mint that has been plowed.

Site of action (oxyfluorfen) Group 14: protoporphyrinogen oxidase inhibitor; (paraquat) Group 22: photosystem I electron diversion

Chemical family (oxyfluorfen) diphenylether; (paraquat) bipyridilium

paraquat (several formulations)

Rate 0.49 to 0.75 lb ai/A (1.3 to 2 pints/A 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, 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

pelargonic acid (Scythe)

Rate Apply in a total water volume of 75 to 200 gallons per acre. Apply as a 3-5% (v/v) solution on young, small annual weeds and 5-7% (v/v) solution on perennial herbaceous weeds or annual weeds over 6 inches tall. For difficult to control weeds and maximum vegetation control use 7-10% (v/v).

Time Apply while mint is dormant and before mint emerges to control winter annual or early emerged weeds. Don’t allow spray to contact emerged mint. Small weeds are easier to control than larger weeds. Warm weather promotes rapid activity on plants.

Remarks Apply as a spot treatment or as a directed and shielded spray avoiding contact with emerged mint. Contact of spray or spray drift with emerged vegetation will result in damage. Repeat applications required to control new weeds emerging from seed or underground vegetative parts. Broadleaf weeds are generally controlled better than grass weeds and repeated use may select for grasses.

Caution Pelargonic acid is a nonselective herbicide and any spray contacting desirable vegetation will likely result in damage. Partially green growth contacted with spray will be killed or stunted.

Site of action Group 26 unknown. Disrupts cell membranes causing leakage from the cells and rapid wilting.

Chemical family Carboxylic acid

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 Supplemental label. 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

trifluralin (Treflan, Trifluralin, or Triflurex HFP )

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 months after applying. Do not plant corn, sorghum (milo), or oats for 14 months after applying.

Site of action Group 3: microtubule assembly inhibitor

Chemical family Dinitroaniline

MINT—Annual Broadleaf Weeds

bromoxynil (several trade names)

Rate 0.25 to 0.38 lb ai/A (0.5 lb ai/A allowed with chemigation application only)

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 weeks of a terbacil (Sinbar) application.

Remarks Crop injury may be unacceptable if applied when temperature is expected to exceed 70°F for the first 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. May also be applied through sprinkler irrigation systems to dormant mint.

Caution Preharvest interval is 70 days. May stunt or discolor mint. Do not apply to mint growing under adverse conditions including 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 because the crop may be injured.

Site of action Group 6: photosystem II inhibitor

Chemical family Nitrile

oxyfluorfen (several trade names)

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, January and through February generally provide best results. In other areas, apply from December through early 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. Non-tilled 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

MINT—Annual and Perennial Broadleaf Weeds

bentazon (Basagran, Rezult B)

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 acts on contact, so thorough coverage is important. 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 for activity on weeds. May be tank mixed with bromoxynil, terbacil, or clopyralid to broaden broadleaf weed control spectrum.

Caution Some mint leaves may burn under certain conditions. Do not apply during unseasonably cold weather or drought. Rain or overhead irrigation within 8 hours 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

clopyralid (several trade names)

Rate Fall treatment: for annual weeds use 0.19 lb ae/A (0.5 pint/A product); for perennial weeds use 0.25 lb ae/A (0.66 pint/A product); for hard-to-kill perennial weeds use 0.375 lb ae/A (1 pint/A product). Spring treatment: annual weeds use 0.124 lb ae/A (0.33 pint/A product); perennial weeds 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. Clopyralid can cause stunting of mint growth and application to dormant mint or mint under 8 inches tall allows more time for mint to fully recover. 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, alfalfa 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 oil 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 (many trade names)

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 Any emerged 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.

glyphosate (many trade names)

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

MCPB (Thistrol Herbicide)

Rate Use 0.25 to 0.5 lb ae/A (1 to 2 pint/A product).

Time For field bindweed suppression a single spring application works best. Field bindweed control improves as runners begin to exceed 6 to 8 inches. Apply in fall for susceptible winter annuals, and in spring for summer annuals when weeds are small and actively growing.

Remarks Do not apply within 40 days of harvest. Many broadleaf weed species will not be controlled at low rates labeled for use in mint.

Caution Mint may be discolored or twisted following MCPB application. Mint oil yields may be reduced if applications are made when the crop is 6 inches or taller. Do not use if minor mint injury is unacceptable. If tank mixing with other herbicides, test on small area prior to application to entire field to determine if mint injury is acceptable.

Site of action Group 4: synthetic auxin

Chemical family Phenoxy; phenoxyalkanoic acid

MINT—Annual and Perennial Grass Weeds

clethodim (several trade names)

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

glyphosate (many trade names)

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, otherwise 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

glyphosate (many trade names)

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 are labeled for this use. 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

quizalofop (Assure II, Targa EC, Se-Cure EC)

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 hour after application. Consult label for crop rotation restrictions.

Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor

Chemical family Aryloxyphenoxy propionate

sethoxydim (several trade names)

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 hour 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

Herbicide Effectiveness on Weeds in Mint

Weed Family	MCPB	flumioxazin	sethoxydim	quizalofop	clethodim	bromoxynil	sulfentrazone	oxyfluorfen	diuron	terbacil	clomazone	trifluralin	napropamide	clopyralid	bentazon	paraquat	pendimethalin
E = excellent G = good F = fair P = poor — = no information
Amaranth
Amaranth, Powell (A) Amaranthus powellii	F-G	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	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		G	P	P	P	G	F-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	F-G	P	P	P	F	F-G	F-G	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	F-G	G	P	P	P	F-G	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	F	—	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	F	G	G	P	P	G	G	G
Lambsquarters (A) Chenopodium album	F-G	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	P	F	G	G	G	P	P	F	G	F	G	G	G	P	P	G	G
Bermudagrass (P) Cynodon dactylon	P	—	F	G	G	P	P	P	P	P	—	P	P	P	P	P	P
Bluegrass, annual (A-P) Poa annua	P	—	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	P	F	P
Bluegrass, Kentucky (P) Poa pratensis	P	—	F	G	F	P	—	P	P	P	—	P	P	P	P	F	P
Brome, downy (A) Bromus tectorum	P	—	P	F-G	F-G	P	—	—	P	G	F-G	F	G	P	P	G	F
Crabgrass, large (A) Digitaria sanguinalis	P	F	—	—	—	—	P	—	—	—	G	—	—	P	—	—	—
Fescue, rattail (A) Vulpia myuros	P	—	P	P	P	P	—	F	F-G	G	F	G	P	P	P	F-G	—
Foxtail, green (A) Setaria viridis	P	F	F-G	G	G	P	P	F	F	F	G	G	F	P	P	G	G
Foxtail, yellow (A) Setaria lutescens	P	—	G	G	G	P	P	F	F	F	G	G	G	P	P	G	G
Oat, wild (A) Avena fatua	P	—	G	G	G	P	—	F	P	G	—	P	G	P	P	G	G
Quackgrass (P) Elytrigia repens	P	—	F	G	F-G	P	P	P	P	G	F-G	P	P	P	P	F	P
Ryegrass, Italian (A-B) Lolium multiflorum	P	—	G	G	G	P	—	G	F	F	—	F	F	P	P	G	—
Ryegrass, perennial (P) Lolium perenne	P	—	G	G	G	P	—	P	P	P	—	P	P	P	P	F	—
Sandbur (A) Cenchrus longispinus	P	—	G	G	G	P	P	—	F	F	—	G	—	P	P	—	G
Velvetgrass (P) Holcus lanatus	P	—	F-G	P	F-G	P	—	P	P	G	—	P	P	P	P	F	—
Wheat, volunteer (A) Triticum aestivum	P	—	G	G	G	P	—	—	P	F	G	P	F	P	P	G	—
Witchgrass (A) Panicum capillare	P	—	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	F-G	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		G	P	P	P	F	G	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	F	—	P	P	P	P	F	P	P	P	F	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		F	P	P	P	G	F	—	G	G	F-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	F	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) Solanum 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