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 Cover Crops
Injury Likely
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 1 – 2 qt | 60 | Can 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/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 0.66 oz / 0.75 oz | 21 | Sensitive crops have 10 – 18 month restriction | More persistent in high pH soils (>7) |
Active ingredient: pyroxasulfone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 0.16 (lbm/ac) | 16 – 26 | Cotton, maize, mung beans, sorghum, soybeans and sunflowers have 5 month restriction. |
Active ingredient: simazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Soil pH > 7 |
Active ingredient: metolachlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 1.67 pt | 15 – 50 | Labeled for use on many crops | Higher rates and later applications more of a potential problem |
Active ingredient: tembotrione + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 3 fl. oz | 15 | Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfa | 15 inches of cumulative precipitation required from application to planting rotation crops except wheat |
Active ingredient: topromesone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 0.75 fl. oz | 14 | Alfalfa, canola, soybean and sunflower have a 9 mo. restriction |
Injury Possible
Active ingredient: acetochlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 pt | 10 – 20 | Four mo. for wheat and 9 mo. for alfalfa and clovers | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops are allowed after corn harvest |
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, ryegrass, legumes, and mustards | More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility |
Active ingredient: dimethenamid
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 fl. oz | 20 | Four mo. for cereal grains and anything the following spring | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: isoxaflutole
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz
6 fl. oz |
50 – 120 | Small seeded leg umes and vegetables have a 10 to 18 month restriction | Fall cereal grains | Cereals, Ryegrass, legumes, and mustards | 15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower |
Active ingredient: isoxaflutole + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5.6 fl. oz | 50 – 120 | Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canola | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 to 30 inches of cumulative precipitation from application to planting for sensitive crops |
Active ingredient: metribuzin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.33 lb | 14 – 60 | Recrop restrictions range from 4 to 12 mo. | Cereal grains and ryegrass | Slight risk for small seeded legumes and mustards | Nonfood / feed winter cover crops allowed |
Active ingredient: pendamethalin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 pt | 44 | Wheat and barley after 4 mo. Other rotational crops the following year. | Cereal grains | Small seeded legumes and annual ryegrass | Nonfood / feed winter cover crops should be OK |
Injury Unlikely
Active ingredient: clopyralid
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5 oz | 40 | Recrop intervals 10.5 to 18 mo. for legumes | All grasses | Small seeded legumes |
Active ingredient: dicamba
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 to 24 fl. oz | 5 – 14 | 15 days per 8 fl. oz/acre for small grains | All crops | Only at high rates or less than 120 days after application | Anything can be planted after 120 days with 24 fl. oz/acre or less |
Active ingredient: flumetsulam
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 oz | 14 – 120 | Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canola | Cereal grains | Small seeded legumes, mustards, and annual ryegrass | Cover crops and forage grasses are restricted for 9 mo. |
Active ingredient: halosulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 / 3 oz | 9 – 27 | Nine mo. for alfalfa, clovers, soybean and 15 mo. for canola | Cereal grains and sorghum after 2 mo. and other grasses | Small seeded legumes, mustards | Halosulfuron also an ingredient in Yukon |
Active ingredient: mesotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 – 6 fl. oz | 5 – 32 | 10 to 18 months for legumes and vegetables | All grasses | Small seeded legumes, mustards | Sequential applications (PRE fb POST) increase the potential for injury |
Active ingredient: rimsulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 oz | 2 – 4 | Winter 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 PA | None | More persistent in drought conditions |
Active ingredient: saflufenacil
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 7 – 35 | Any crop can be planted 4 mo. after application | All | None | This product has been reported more persistent in western Canada |
Legume Cover Crops
Injury Likely
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 1 – 2 qt | 60 | Can 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/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5 oz | 40 | Recrop intervals 10.5 to 18 mo. for legumes | All grasses | Small seeded legumes |
Active ingredient: flumetsulam
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 oz | 14 – 120 | Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canola | Cereal grains | Small seeded legumes, mustards, and annual ryegrass | Cover crops and forage grasses are restricted for 9 mo. |
Active ingredient: halosulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 / 3 oz | 9 – 27 | Nine mo. for alfalfa, clovers, soybean and 15 mo. for canola | Cereal grains and sorghum after 2 mo. and other grasses | Small seeded legumes, mustards | Halosulfuron also an ingredient in Yukon |
Active ingredient: isoxaflutole + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5.6 fl. oz | 50 – 120 | Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canola | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 to 30 inches of cumulative precipitation from application to planting for sensitive crops |
Active ingredient: isoxaflutole
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz
6 fl. oz |
50 – 120 | Small seeded leg umes and vegetables have a 10 to 18 month restriction | Fall cereal grains | Cereals, Ryegrass, legumes, and mustards | 15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower |
Active ingredient: mesotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 – 6 fl. oz | 5 – 32 | 10 to 18 months for legumes and vegetables | All grasses | Small seeded legumes, mustards | Sequential applications (PRE fb POST) increase the potential for injury |
Active ingredient: pyroxasulfone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.133 | 20 | 4 mo. for wheat, 11 mo. for other small grains, and 10 mo. for alfalfa | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: simazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, Ryegrass, legumes, and mustards | Soil pH > 7 |
Active ingredient: tembotrione + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 15 | Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfa | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 inches of cumulative precipitation required from application to planting rotation crops except wheat |
Active ingredient: topromesone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.75 fl. oz | 14 | Alfalfa, canola, soybean and sunflower have a 9 mo. restriction | Wheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OK | Although many broadleaves are restricted, Impact does not have much soil activity |
Injury Possible
Active ingredient: acetochlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 pt | 10 – 20 | Four mo. for wheat and 9 mo. for alfalfa and clovers | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops are allowed after corn harvest |
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, ryegrass, legumes, and mustards | More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility |
Active ingredient: dicamba
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 to 24 fl. oz | 5 – 14 | 15 days per 8 fl. oz/acre for small grains | All crops | Only at high rates or less than 120 days after application | Anything can be planted after 120 days with 24 fl. oz/acre or less |
Active ingredient: dimethenamid
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 fl. oz | 20 | Four mo. for cereal grains and anything the following spring | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: metribuzin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.33 lb | 14 – 60 | Recrop restrictions range from 4 to 12 mo. | Cereal grains and ryegrass | Slight risk for small seeded legumes and mustards | Nonfood / feed winter cover crops allowed |
Active ingredient: pendamethalin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 pt | 44 | Wheat and barley after 4 mo. Other rotational crops the following year. | Cereal grains | Small seeded legumes and annual ryegrass | Nonfood / feed winter cover crops should be OK |
Active ingredient: metolachlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1.67 pt | 15 – 50 | Labeled for use on many crops | Almost anything | Annual ryegrass or other small seeded grasses | Higher rates and later applications more of a potential problem |
Injury Unlikely
Active ingredient: rimsulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 oz | 2 – 4 | Winter 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 PA | None | More persistent in drought conditions |
Active ingredient: saflufenacil
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 7 – 35 | Any crop can be planted 4 mo. after application | All | None | This product has been reported more persistent in western Canada |
Broadleaf Cover Crops
Injury Likely
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 1 – 2 qt | 60 | Can 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/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 oz | 14 – 120 | Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canola | Cereal grains | Small seeded legumes, mustards, and annual ryegrass | Cover crops and forage grasses are restricted for 9 mo. |
Active ingredient: halosulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 / 3 oz | 9 – 27 | Nine mo. for alfalfa, clovers, soybean and 15 mo. for canola | Cereal grains and sorghum after 2 mo. and other grasses | Small seeded legumes, mustards | Halosulfuron also an ingredient in Yukon |
Active ingredient: isoxaflutole
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz
6 fl. oz |
50 – 120 | Small seeded leg umes and vegetables have a 10 to 18 month restriction | Fall cereal grains | Cereals, Ryegrass, legumes, and mustards | 15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower |
Active ingredient: isoxaflutole + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5.6 fl. oz | 50 – 120 | Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canola | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 to 30 inches of cumulative precipitation from application to planting for sensitive crops |
Active ingredient: mesotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 – 6 fl. oz | 5 – 32 | 10 to 18 months for legumes and vegetables | All grasses | Small seeded legumes, mustards | Sequential applications (PRE fb POST) increase the potential for injury |
Active ingredient: simazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, Ryegrass, legumes, and mustards | Soil pH > 7 |
Injury Possible
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, ryegrass, legumes, and mustards | More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility |
Active ingredient: metribuzin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.33 lb | 14 – 60 | Recrop restrictions range from 4 to 12 mo. | Cereal grains and ryegrass | Slight risk for small seeded legumes and mustards | Nonfood / feed winter cover crops allowed |
Active ingredient: pendamethalin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 pt | 44 | Wheat and barley after 4 mo. Other rotational crops the following year. | Cereal grains | Small seeded legumes and annual ryegrass | Nonfood / feed winter cover crops should be OK |
Active ingredient: pyroxasulfone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.133 | 20 | 4 mo. for wheat, 11 mo. for other small grains, and 10 mo. for alfalfa | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: tembotrione + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 15 | Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfa | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 inches of cumulative precipitation required from application to planting rotation crops except wheat |
Active ingredient: tembotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 14 | Four mo. for cereal grains, 10 mo. for sorghum, canola, and alfalfa | Cereal grains after 4 mo. | Unknown – Small seeded legumes, mustards could be a problem | Other crops may be seeded after a successful field bioassay. |
Active ingredient: topromesone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.75 fl. oz | 14 | Alfalfa, canola, soybean and sunflower have a 9 mo. restriction | Wheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OK | Although many broadleaves are restricted, Impact does not have much soil activity |
Injury Unlikely
Active ingredient: acetochlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 pt | 10 – 20 | Four mo. for wheat and 9 mo. for alfalfa and clovers | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops are allowed after corn harvest |
Active ingredient: clopyralid
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5 oz | 40 | Recrop intervals 10.5 to 18 mo. for legumes | All grasses | Small seeded legumes |
Active ingredient: dimethenamid
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 fl. oz | 20 | Four mo. for cereal grains and anything the following spring | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: dicamba
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 to 24 fl. oz | 5 – 14 | 15 days per 8 fl. oz/acre for small grains | All crops | Only at high rates or less than 120 days after application | Anything can be planted after 120 days with 24 fl. oz/acre or less |
Active ingredient: pendamethalin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 pt | 44 | Wheat and barley after 4 mo. Other rotational crops the following year. | Cereal grains | Small seeded legumes and annual ryegrass | Nonfood / feed winter cover crops should be OK |
Active ingredient: rimsulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 oz | 2 – 4 | Winter 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 PA | None | More persistent in drought conditions |
Active ingredient: saflufenacil
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 7 – 35 | Any crop can be planted 4 mo. after application | All | None | This product has been reported more persistent in western Canada |
Active ingredient: metolachlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1.67 pt | 15 – 50 | Labeled for use on many crops | Almost anything | Annual ryegrass or other small seeded grasses | Higher rates and later applications more of a potential problem |
Grass / Legume / Broadleaf Mixtures
Injury Likely
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | Other |
|---|---|---|---|
| 1 – 2 qt | 60 | Can 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/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5 oz | 40 | Recrop intervals 10.5 to 18 mo. for legumes | All grasses | Small seeded legumes |
Active ingredient: flumetsulam
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 oz | 14 – 120 | Cash crop restrictions from 4 mo. for alfalfa and cereals to 26 mo. for canola | Cereal grains | Small seeded legumes, mustards, and annual ryegrass | Cover crops and forage grasses are restricted for 9 mo. |
Active ingredient: halosulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 / 3 oz | 9 – 27 | Nine mo. for alfalfa, clovers, soybean and 15 mo. for canola | Cereal grains and sorghum after 2 mo. and other grasses | Small seeded legumes, mustards | Halosulfuron also an ingredient in Yukon |
Active ingredient: isoxaflutole + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 5.6 fl. oz | 50 – 120 | Four mo. for wheat, 9 mo. for barley and 17 mo. for alfalfa, oats, soghum, and canola | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 to 30 inches of cumulative precipitation from application to planting for sensitive crops |
Active ingredient: isoxaflutole
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz
6 fl. oz |
50 – 120 | Small seeded leg umes and vegetables have a 10 to 18 month restriction | Fall cereal grains | Cereals, Ryegrass, legumes, and mustards | 15 inches of cumulative precipitation required from application to planting rotation crops except soybean, barely, weat, sorghum, and sunflower |
Active ingredient: mesotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 – 6 fl. oz | 5 – 32 | 10 to 18 months for legumes and vegetables | All grasses | Small seeded legumes, mustards | Sequential applications (PRE fb POST) increase the potential for injury |
Active ingredient: nicosulfuron / nicosulfuron + rimsulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.66 oz / 0.75 oz | 21 | Sensitive crops have 10 – 18 month restriction | Fall cereal grains, ryegrass | Small seeded legumes, mustards, sorghum | More persistent in high pH soils (>7) |
Active ingredient: pyroxasulfone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.133 | 20 | 4 mo. for wheat, 11 mo. for other small grains, and 10 mo. for alfalfa | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: simazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, Ryegrass, legumes, and mustards | Soil pH > 7 |
Active ingredient: metolachlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1.67 pt | 15 – 50 | Labeled for use on many crops | Almost anything | Annual ryegrass or other small seeded grasses | Higher rates and later applications more of a potential problem |
Active ingredient: tembotrione + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 15 | Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfa | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 inches of cumulative precipitation required from application to planting rotation crops except wheat |
Active ingredient: tembotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 14 | Four mo. for cereal grains, 10 mo. for sorghum, canola, and alfalfa | Cereal grains after 4 mo. | Unknown – Small seeded legumes, mustards could be a problem | Other crops may be seeded after a successful field bioassay. |
Active ingredient: topromesone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.75 fl. oz | 14 | Alfalfa, canola, soybean and sunflower have a 9 mo. restriction | Wheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OK | Although many broadleaves are restricted, Impact does not have much soil activity |
Injury Possible
Active ingredient: acetochlor
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 pt | 10 – 20 | Four mo. for wheat and 9 mo. for alfalfa and clovers | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops are allowed after corn harvest |
Active ingredient: atrazine
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 1 – 2 qt | 60 | Can plant corn, sorghum, and soybean the following year (some products allow others) | Sorghum species | Cereals, ryegrass, legumes, and mustards | More persistent in high pH soils (>7). Rates <1 lb/acre can allow more flexibility |
Active ingredient: dicamba
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 to 24 fl. oz | 5 – 14 | 15 days per 8 fl. oz/acre for small grains | All crops | Only at high rates or less than 120 days after application | Anything can be planted after 120 days with 24 fl. oz/acre or less |
Active ingredient: dimethenamid
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 16 fl. oz | 20 | Four mo. for cereal grains and anything the following spring | Most crops should be fine | Food or feed residues rather than crop injury may be a concern | Nonfood / feed winter cover crops should be OK after corn harvest |
Active ingredient: metribuzin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.33 lb | 14 – 60 | Recrop restrictions range from 4 to 12 mo. | Cereal grains and ryegrass | Slight risk for small seeded legumes and mustards | Nonfood / feed winter cover crops allowed |
Active ingredient: pendamethalin
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 pt | 44 | Wheat and barley after 4 mo. Other rotational crops the following year. | Cereal grains | Small seeded legumes and annual ryegrass | Nonfood / feed winter cover crops should be OK |
Active ingredient: tembotrione + thiencarbazone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 15 | Four mo. for wheat, 10 mo. for barley, sorghum, oats and alfalfa | Wheat, triticale, rye | Small seeded legumes, mustards, sorghum | 15 inches of cumulative precipitation required from application to planting rotation crops except wheat |
Active ingredient: tembotrione
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 14 | Four mo. for cereal grains, 10 mo. for sorghum, canola, and alfalfa | Cereal grains after 4 mo. | Unknown – Small seeded legumes, mustards could be a problem | Other crops may be seeded after a successful field bioassay. |
Active ingredient: topromesone
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 0.75 fl. oz | 14 | Alfalfa, canola, soybean and sunflower have a 9 mo. restriction | Wheat, barley, oats, and rye are allowed after 3 mo. Ryegrass should also be OK | Although many broadleaves are restricted, Impact does not have much soil activity |
Injury Unlikely
Active ingredient: rimsulfuron
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 2 oz | 2 – 4 | Winter 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 PA | None | More persistent in drought conditions |
Active ingredient: saflufenacil
| Normal Rate/acre | Half life (days) | Cash crop restrictions | OK (Fall Cover Crops) | Concern (Fall Cover Crops) | Other |
|---|---|---|---|---|---|
| 3 fl. oz | 7 – 35 | Any crop can be planted 4 mo. after application | All | None | This product has been reported more persistent in western Canada |
Common soybean herbicides and potential to injure early/interseeded cover crops.
| Trade Name | Active Ingredient | Grasses | Legumes | Broadelafs |
|---|---|---|---|---|
| Classic, Canopy, Envive, etc. | chlorimuron | |||
| Select | clethodim | |||
| FirstRate | cloransulam | |||
| Valor | flumioxazin | |||
| Flexstar, Reflex | fomesafen | |||
| Raptor | imazamox | |||
| Pursuit | imazethapyr | |||
| Assure, Targa | quizalofop | |||
| Authority | sulfentrazone |
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