Common corn herbicides and potential to injure early/interseeded cover crops.

Please note that the listing of any particular herbicide in the listing below does not constitute an endoresement of any kind for any product.  Products listed are believed to be common products and are listed for illustrative purposes with respect to their effects on cover crop plantings.  Information is based on Eastern U.S. information and may not be applicable to other locations.  Please be sure to discuss your options with your Bio Till Cover Crop Dealer or Bio Till Cover Crop Expert prior to any planting or business decision.

Grass Icon - GreenGrass Cover Crops

Injury Likely

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: nicosulfuron / nicosulfuron + rimsulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
0.66 oz / 0.75 oz21Sensitive crops have 10 – 18 month restrictionMore persistent in high pH soils (>7)

Active ingredient: pyroxasulfone

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
0.16 (lbm/ac)16 – 26Cotton, maize, mung beans, sorghum, soybeans and sunflowers have 5 month restriction.

Active ingredient: simazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Soil pH > 7

Active ingredient: metolachlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
1.67 pt15 – 50Labeled for use on many cropsHigher rates and later applications more of a potential problem

Active ingredient: tembotrione + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
3 fl. oz15Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfa15 inches of cumulative precipitation required from application to planting rotation crops except wheat

Active ingredient: topromesone

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
0.75 fl. oz14Alfalfa, canola, soybean and sunflower have a 9 mo. restriction

Injury Possible

Active ingredient: acetochlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 pt10 – 20Four mo. for wheat and 9 mo. for alfalfa and cloversMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops are allowed after corn harvest

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, ryegrass, legumes, and mustardsMore persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: dimethenamid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 fl. oz20Four mo. for cereal grains and anything the following springMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: isoxaflutole

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz

6 fl. oz

50 – 120Small seeded leg umes and vegetables have a 10 to 18 month restrictionFall cereal grainsCereals, Ryegrass, legumes, and mustards15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower

Active ingredient: isoxaflutole + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5.6 fl. oz50 – 120Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canolaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 to 30 inches of cumulative precipitation from application to planting for sensitive crops

Active ingredient: metribuzin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.33 lb14 – 60Recrop restrictions range from 4 to 12 mo.Cereal grains and ryegrassSlight risk for small seeded legumes and mustardsNonfood / feed winter cover crops allowed

Active ingredient: pendamethalin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 pt44Wheat and barley after 4 mo. Other rotational crops the following year.Cereal grainsSmall seeded legumes and annual ryegrassNonfood / feed winter cover crops should be OK

Injury Unlikely

Active ingredient: clopyralid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5 oz40Recrop intervals 10.5 to 18 mo. for legumesAll grassesSmall seeded legumes

Active ingredient: dicamba

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 to 24 fl. oz5 – 1415 days per 8 fl. oz/acre for small grainsAll cropsOnly at high rates or less than 120 days after applicationAnything can be planted after 120 days with 24 fl. oz/acre or less

Active ingredient: flumetsulam

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 oz14 – 120Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canolaCereal grainsSmall seeded legumes, mustards, and annual ryegrassCover crops and forage grasses are restricted for 9 mo.

Active ingredient: halosulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 / 3 oz9 – 27Nine mo. for alfalfa, clovers, soybean and 15 mo. for canolaCereal grains and sorghum after 2 mo. and other grassesSmall seeded legumes, mustardsHalosulfuron also an ingredient in Yukon

Active ingredient: mesotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 – 6 fl. oz5 – 3210 to 18 months for legumes and vegetablesAll grassesSmall seeded legumes, mustardsSequential applications (PRE fb POST) increase the potential for injury

Active ingredient: rimsulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 oz2 – 4Winter cereals have a 3 mo. restriction and many crops are restricted for 10 mo.Based on the short half-life, most fall cover crops should be OK in PANoneMore persistent in drought conditions

Active ingredient: saflufenacil

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz7 – 35Any crop can be planted 4 mo. after applicationAllNoneThis product has been reported more persistent in western Canada

Legume Icon - RedLegume Cover Crops

Injury Likely

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: clopyralid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5 oz40Recrop intervals 10.5 to 18 mo. for legumesAll grassesSmall seeded legumes

Active ingredient: flumetsulam

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 oz14 – 120Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canolaCereal grainsSmall seeded legumes, mustards, and annual ryegrassCover crops and forage grasses are restricted for 9 mo.

Active ingredient: halosulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 / 3 oz9 – 27Nine mo. for alfalfa, clovers, soybean and 15 mo. for canolaCereal grains and sorghum after 2 mo. and other grassesSmall seeded legumes, mustardsHalosulfuron also an ingredient in Yukon

Active ingredient: isoxaflutole + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5.6 fl. oz50 – 120Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canolaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 to 30 inches of cumulative precipitation from application to planting for sensitive crops

Active ingredient: isoxaflutole

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz

6 fl. oz

50 – 120Small seeded leg umes and vegetables have a 10 to 18 month restrictionFall cereal grainsCereals, Ryegrass, legumes, and mustards15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower

Active ingredient: mesotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 – 6 fl. oz5 – 3210 to 18 months for legumes and vegetablesAll grassesSmall seeded legumes, mustardsSequential applications (PRE fb POST) increase the potential for injury

Active ingredient: pyroxasulfone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.133204 mo. for wheat, 11 mo. for other small grains, and 10 mo. for alfalfaMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: simazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, Ryegrass, legumes, and mustardsSoil pH > 7

Active ingredient: tembotrione + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz15Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 inches of cumulative precipitation required from application to planting rotation crops except wheat

Active ingredient: topromesone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.75 fl. oz14Alfalfa, canola, soybean and sunflower have a 9 mo. restrictionWheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OKAlthough many broadleaves are restricted, Impact does not have much soil activity

Injury Possible

Active ingredient: acetochlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 pt10 – 20Four mo. for wheat and 9 mo. for alfalfa and cloversMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops are allowed after corn harvest

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, ryegrass, legumes, and mustardsMore persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: dicamba

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 to 24 fl. oz5 – 1415 days per 8 fl. oz/acre for small grainsAll cropsOnly at high rates or less than 120 days after applicationAnything can be planted after 120 days with 24 fl. oz/acre or less

Active ingredient: dimethenamid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 fl. oz20Four mo. for cereal grains and anything the following springMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: metribuzin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.33 lb14 – 60Recrop restrictions range from 4 to 12 mo.Cereal grains and ryegrassSlight risk for small seeded legumes and mustardsNonfood / feed winter cover crops allowed

Active ingredient: pendamethalin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 pt44Wheat and barley after 4 mo. Other rotational crops the following year.Cereal grainsSmall seeded legumes and annual ryegrassNonfood / feed winter cover crops should be OK

Active ingredient: metolachlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1.67 pt15 – 50Labeled for use on many cropsAlmost anythingAnnual ryegrass or other small seeded grassesHigher rates and later applications more of a potential problem

Injury Unlikely

Active ingredient: rimsulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 oz2 – 4Winter cereals have a 3 mo. restriction and many crops are restricted for 10 mo.Based on the short half-life, most fall cover crops should be OK in PANoneMore persistent in drought conditions

Active ingredient: saflufenacil

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz7 – 35Any crop can be planted 4 mo. after applicationAllNoneThis product has been reported more persistent in western Canada

Broadleaf Icon - BlueBroadleaf Cover Crops

Injury Likely

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: flumetsulam

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 oz14 – 120Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canolaCereal grainsSmall seeded legumes, mustards, and annual ryegrassCover crops and forage grasses are restricted for 9 mo.

Active ingredient: halosulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 / 3 oz9 – 27Nine mo. for alfalfa, clovers, soybean and 15 mo. for canolaCereal grains and sorghum after 2 mo. and other grassesSmall seeded legumes, mustardsHalosulfuron also an ingredient in Yukon

Active ingredient: isoxaflutole

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz

6 fl. oz

50 – 120Small seeded leg umes and vegetables have a 10 to 18 month restrictionFall cereal grainsCereals, Ryegrass, legumes, and mustards15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower

Active ingredient: isoxaflutole + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5.6 fl. oz50 – 120Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canolaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 to 30 inches of cumulative precipitation from application to planting for sensitive crops

Active ingredient: mesotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 – 6 fl. oz5 – 3210 to 18 months for legumes and vegetablesAll grassesSmall seeded legumes, mustardsSequential applications (PRE fb POST) increase the potential for injury

Active ingredient: simazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, Ryegrass, legumes, and mustardsSoil pH > 7

Injury Possible

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, ryegrass, legumes, and mustardsMore persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: metribuzin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.33 lb14 – 60Recrop restrictions range from 4 to 12 mo.Cereal grains and ryegrassSlight risk for small seeded legumes and mustardsNonfood / feed winter cover crops allowed

Active ingredient: pendamethalin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 pt44Wheat and barley after 4 mo. Other rotational crops the following year.Cereal grainsSmall seeded legumes and annual ryegrassNonfood / feed winter cover crops should be OK

Active ingredient: pyroxasulfone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.133204 mo. for wheat, 11 mo. for other small grains, and 10 mo. for alfalfaMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: tembotrione + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz15Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 inches of cumulative precipitation required from application to planting rotation crops except wheat

Active ingredient: tembotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz14Four mo. for cereal grains, 10 mo. for sorghum, canola, and alfalfaCereal grains after 4 mo.Unknown – Small seeded legumes, mustards could be a problemOther crops may be seeded after a successful field bioassay.

Active ingredient: topromesone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.75 fl. oz14Alfalfa, canola, soybean and sunflower have a 9 mo. restrictionWheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OKAlthough many broadleaves are restricted, Impact does not have much soil activity

Injury Unlikely

Active ingredient: acetochlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 pt10 – 20Four mo. for wheat and 9 mo. for alfalfa and cloversMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops are allowed after corn harvest

Active ingredient: clopyralid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5 oz40Recrop intervals 10.5 to 18 mo. for legumesAll grassesSmall seeded legumes

Active ingredient: dimethenamid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 fl. oz20Four mo. for cereal grains and anything the following springMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: dicamba

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 to 24 fl. oz5 – 1415 days per 8 fl. oz/acre for small grainsAll cropsOnly at high rates or less than 120 days after applicationAnything can be planted after 120 days with 24 fl. oz/acre or less

Active ingredient: pendamethalin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 pt44Wheat and barley after 4 mo. Other rotational crops the following year.Cereal grainsSmall seeded legumes and annual ryegrassNonfood / feed winter cover crops should be OK

Active ingredient: rimsulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 oz2 – 4Winter cereals have a 3 mo. restriction and many crops are restricted for 10 mo.Based on the short half-life, most fall cover crops should be OK in PANoneMore persistent in drought conditions

Active ingredient: saflufenacil

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz7 – 35Any crop can be planted 4 mo. after applicationAllNoneThis product has been reported more persistent in western Canada

Active ingredient: metolachlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1.67 pt15 – 50Labeled for use on many cropsAlmost anythingAnnual ryegrass or other small seeded grassesHigher rates and later applications more of a potential problem

Grass Icon - GreenLegume Icon - RedBroadleaf Icon - BlueGrass / Legume / Broadleaf Mixtures

Injury Likely

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOther
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: clopyralid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5 oz40Recrop intervals 10.5 to 18 mo. for legumesAll grassesSmall seeded legumes

Active ingredient: flumetsulam

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 oz14 – 120Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canolaCereal grainsSmall seeded legumes, mustards, and annual ryegrassCover crops and forage grasses are restricted for 9 mo.

Active ingredient: halosulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 / 3 oz9 – 27Nine mo. for alfalfa, clovers, soybean and 15 mo. for canolaCereal grains and sorghum after 2 mo. and other grassesSmall seeded legumes, mustardsHalosulfuron also an ingredient in Yukon

Active ingredient: isoxaflutole + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
5.6 fl. oz50 – 120Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canolaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 to 30 inches of cumulative precipitation from application to planting for sensitive crops

Active ingredient: isoxaflutole

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz

6 fl. oz

50 – 120Small seeded leg umes and vegetables have a 10 to 18 month restrictionFall cereal grainsCereals, Ryegrass, legumes, and mustards15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower

Active ingredient: mesotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 – 6 fl. oz5 – 3210 to 18 months for legumes and vegetablesAll grassesSmall seeded legumes, mustardsSequential applications (PRE fb POST) increase the potential for injury

Active ingredient: nicosulfuron / nicosulfuron + rimsulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.66 oz / 0.75 oz21Sensitive crops have 10 – 18 month restrictionFall cereal grains, ryegrassSmall seeded legumes, mustards, sorghumMore persistent in high pH soils (>7)

Active ingredient: pyroxasulfone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.133204 mo. for wheat, 11 mo. for other small grains, and 10 mo. for alfalfaMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: simazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, Ryegrass, legumes, and mustardsSoil pH > 7

Active ingredient: metolachlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1.67 pt15 – 50Labeled for use on many cropsAlmost anythingAnnual ryegrass or other small seeded grassesHigher rates and later applications more of a potential problem

Active ingredient: tembotrione + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz15Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 inches of cumulative precipitation required from application to planting rotation crops except wheat

Active ingredient: tembotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz14Four mo. for cereal grains, 10 mo. for sorghum, canola, and alfalfaCereal grains after 4 mo.Unknown – Small seeded legumes, mustards could be a problemOther crops may be seeded after a successful field bioassay.

Active ingredient: topromesone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.75 fl. oz14Alfalfa, canola, soybean and sunflower have a 9 mo. restrictionWheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OKAlthough many broadleaves are restricted, Impact does not have much soil activity

Injury Possible

Active ingredient: acetochlor

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 pt10 – 20Four mo. for wheat and 9 mo. for alfalfa and cloversMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops are allowed after corn harvest

Active ingredient: atrazine

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
1 – 2 qt60Can plant corn, sorghum, and soybean the following year (some products allow others)Sorghum speciesCereals, ryegrass, legumes, and mustardsMore persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility

Active ingredient: dicamba

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 to 24 fl. oz5 – 1415 days per 8 fl. oz/acre for small grainsAll cropsOnly at high rates or less than 120 days after applicationAnything can be planted after 120 days with 24 fl. oz/acre or less

Active ingredient: dimethenamid

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
16 fl. oz20Four mo. for cereal grains and anything the following springMost crops should be fineFood or feed residues rather than crop injury may be a concernNonfood / feed winter cover crops should be OK after corn harvest

Active ingredient: metribuzin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.33 lb14 – 60Recrop restrictions range from 4 to 12 mo.Cereal grains and ryegrassSlight risk for small seeded legumes and mustardsNonfood / feed winter cover crops allowed

Active ingredient: pendamethalin

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 pt44Wheat and barley after 4 mo. Other rotational crops the following year.Cereal grainsSmall seeded legumes and annual ryegrassNonfood / feed winter cover crops should be OK

Active ingredient: tembotrione + thiencarbazone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz15Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfaWheat, triticale, ryeSmall seeded legumes, mustards, sorghum15 inches of cumulative precipitation required from application to planting rotation crops except wheat

Active ingredient: tembotrione

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz14Four mo. for cereal grains, 10 mo. for sorghum, canola, and alfalfaCereal grains after 4 mo.Unknown – Small seeded legumes, mustards could be a problemOther crops may be seeded after a successful field bioassay.

Active ingredient: topromesone

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
0.75 fl. oz14Alfalfa, canola, soybean and sunflower have a 9 mo. restrictionWheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OKAlthough many broadleaves are restricted, Impact does not have much soil activity

Injury Unlikely

Active ingredient: rimsulfuron

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
2 oz2 – 4Winter cereals have a 3 mo. restriction and many crops are restricted for 10 mo.Based on the short half-life, most fall cover crops should be OK in PANoneMore persistent in drought conditions

Active ingredient: saflufenacil

Normal Rate/acreHalf life (days)Cash crop restrictionsOK (Fall Cover Crops)Concern (Fall Cover Crops)Other
3 fl. oz7 – 35Any crop can be planted 4 mo. after applicationAllNoneThis product has been reported more persistent in western Canada

Common soybean herbicides and potential to injure early/interseeded cover crops.

Trade NameActive IngredientGrassesLegumesBroadelafs
Classic, Canopy, Envive, etc.chlorimuron
Selectclethodim
FirstRatecloransulam
Valorflumioxazin
Flexstar, Reflexfomesafen
Raptorimazamox
Pursuitimazethapyr
Assure, Targaquizalofop
Authoritysulfentrazone

Information on this page and in the above tables can originally be found at:  Cover Crop Interseeder: Improving the Success in Corn. Retrieved from https://extension.psu.edu/cover-crop-interseeder-improving-the-success-in-corn