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Kevin Bradley
University of Missouri
Plant Science & Technology
(573) 882-4039
bradleyke@missouri.edu

Forage, Feed and Grazing Restrictions for Some Common Corn and Soybean Herbicides

Kevin Bradley
University of Missouri
(573) 882-4039
bradleyke@missouri.edu

July 22, 2022

minute read

With the drought we are currently experiencing in much of central and southern Missouri, many farmers are starting to consider using at least some portion of their corn and soybean crop for livestock feeding purposes. Before making this decision, one of the most important considerations is the forage and feeding restrictions of the herbicides that have already been sprayed for weed control in these fields. Tables 1 and 2 contain this information for some of the most common herbicides utilized for weed management in corn and soybeans in Missouri. In corn, the majority of herbicide labels allow for some type of grazing or forage use following application. As illustrated in Table 1, corn herbicide forage restrictions may vary from as little as 0 to as many as 60 days after application. Unfortunately, in soybean most of the product labels DO NOT allow soybean to be grazed or harvested for forage or hay following herbicide application, so it will be critical to consult the individual product label of the herbicide(s) applied before deciding to utilize this crop as a forage.

Table 1 Waiting period before utilizing herbicide-treated corn for grazing or forage (silage) use.

Herbicide Grazing Restriction Forage (silage) Restriction
-----Time After Application-----
2,4-D 7 days 7 days
Accent 30 days 30 days
Acuron 45 days 60 days
Aim none none
Anthem ATZ 60 days 60 days
Atrazine 60 days 60 days
Balance Flexx none none
Banvel after milk stage after milk stage
Beacon 30 days 45 days
Bicep II Magnum/Cinch ATZ 30 days 30 days
Buctril 30 days 30 days
Cadet 90 days 30 days
Callisto do not graze 45 days
Callisto Xtra do not graze 60 days
Capreno 45 days 45 days
Clarity after milk stage after milk stage
Corvus 45 days 45 days
Degree 21 days 21 days
Degree Xtra 21 days 21 days
Distinct 32 days 32 days
Dual II Magnum/Cinch 30 days 30 days
Gramoxone none none
Guardsman Max 40 days 40 days
Halex GT 45 days 45 days
Harness 21 days 21 days
Harness Xtra 21 days 21 days
Hornet 85 days 45 days
Impact 45 days 45 days
Keystone 21 days 21 days
Lariat/Bullet 21 days 21 days
Lasso/Micro-tech none none
Laudis 45 days 45 days
Lexar 45 days 45 days
Liberty 70 days 60 days
Lumax 45 days 45 days
Northstar 30 days 45 days
Outlook 60 days 60 days
Parallel 30 days 30 days
Peak 30 days 40 days
Prowl/Pendimethalin 21 days 21 days
Permit/Sandea 30 days 30 days
Prequel 30 days 30 days
Princep/Simazine do not graze none
Python 85 days 85 days
Realm Q 45 days 45 days
Resicore 45-60 days 45-60 days
Resolve 30 days 30 days
Resource 28 days 28 days
Roundup/other glyphosates 50 days 50 days
Sencor 60 days 60 days
Sharpen 80 days 80 days
Shieldex 45 days 45 days
Status 32 days 32 days
Steadfast 30 days 30 days
Steadfast ATZ 60 days 60 days
SureStart 45 days 45 days
Surpass/Topnotch 21 days 21 days
Stinger 40 days 40 days
TripleFlex 45 days 45 days
Verdict 80 days 80 days
WideMatch 47 days 47 days
Yukon after milk stage, at least 30 days after milk stage, at least 30 days
Zidua none none


Table 2 Waiting period before utilizing herbicide-treated soybean for grazing or haying.

Herbicide Label Statement Pertaining to Interval Between Application and Grazing, Haying, or Feeding Herbicide-treated Soybean
2,4-D (various brands) Consult individual label as product labels can vary. Do not cut for feed treated hay, forage, or fodder or graze treated soybeans to livestock.
Anthem Do not graze or feed treated soybean forage or hay to livestock.
Anthem Maxx Do not graze or feed treated soybean forage or hay to livestock.
Assure II Do not graze treated fields or harvest for forage or hay. Do not apply within 80 days of harvest
Authority Assist Do not feed treated soybean forage, soybean hay or soybean straw to livestock.
Authority First Do not feed treated soybean forage or soybean hay to livestock.
Authority MTZ Do not graze treated soybean or harvest for forage or hay.
Authority XL Do not feed treated soybean forage or soybean hay to livestock.
Basagran Do not graze or cut treated soybean fields for forage or hay for at least 30 days after the last treatment.
Boundary Do not graze or feed treated soybean forage for 40 days after application.
Butyrac 200/2,4-DB Do not feed/graze soybean forage or harvest hay for 60 days following any 2,4-DB application.
Canopy Do not graze treated fields or harvest for forage or hay.
Classic Do not graze treated fields or harvest for forage or hay.
Cobra Do not graze treated fields or harvest for forage or hay.
Dual II Magnum/Cinch Do not graze or feed treated soybean forage, hay, or straw to livestock 30 days following treatment.
Enlist One (used on Enlist soybean) Do not graze treated soybean. Do not harvest for forage or hay.
Enlist Duo (used on Enlist soybean) Do not graze treated soybean. Do not harvest for forage or hay.
Engenia (on Xtend or XtendFlex soybean) Allow at least 7 days between final application and harvest or feeding of soybean forage. Allow at least 14 days between final application and harvest or feeding of soybean hay.
FirstRate Do not apply within 14 days before harvest for forage or hay.
Flexstar/Flexstar GT Do not graze treated areas or harvest for forage or hay.
Fusilade DX Do not graze or harvest for forage or hay.
Glufosinate (Liberty, Interline, etc.) on LibertyLink or Glufosinate-resistant Soybean Do not graze the treated crop or cut for hay.
Glyphosate (Roundup products, generic glyphosate labels Allow a minimum of 14 days between final application and harvest of soybean grain or feeding of soybean grain, forage or hay. Consult individual glyphosate and Roundup product labels. There are individual differences among labels.
Harmony Allow at least 7 days between application and grazing of treated forage. Allow at least 7 days between application and feeding of forage (green chop) from treated areas to livestock. Allow at least 30 days between application and feeding of dried hay from treated areas to livestock.
Metribuzin (various products) Treated vines may be grazed or fed to livestock 40 days after application.
Op-Till Do not graze or feed treated soybean forage, hay or straw to livestock.
Op-Till Pro Do not graze or feed treated soybean forage, hay or straw to livestock.
Outlook Do not graze or feed forage, hay, or straw to livestock.
Poast/Poast Plus Only processed meal from seed or hay may be fed to animals.
Prowl/Prowl H2O Livestock can graze or be fed forage from treated soybean fields
Prefix Do not graze treated areas or harvest for forage or hay.
Pursuit Do not graze or feed treated soybean forage, hay or straw to livestock.
Python Do not graze or feed treated soybean forage, hay or straw to livestock.
Raptor No grazing or forage restrictions listed.
Resource Do not graze treated fields or harvest for forage or hay.
Rhythm Do not graze treated areas or harvest for forage or hay.
Roundup WeatherMax/other Roundup labels/other glyphosate labels Roundup WeatherMax - Allow a minimum of 14 days between final application and harvest of soybean grain or feeding of soybean grain, forage or hay. Consult individual glyphosate and Roundup product labels. There are individual differences among labels.
Scepter Do not graze or feed treated soybean forage, hay or straw to livestock.
Select Max Do not graze treated fields or feed treated forage or hay to livestock.
Sequence Do not feed treated soybean forage or hay for 30 days after application.
Sharpen Soybean forage may be fed or grazed 65 or more days after application.
Sonic Do not feed treated soybean forage or soybean hay to livestock.
Storm Do not allow livestock to graze on treated forage. Do not feed treated vines.
Synchrony XP Do not graze treated fields or harvest for forage or hay.
Treflan Consult product labels. No apparent grazing or forage restrictions when applied in soybeans.
Ultra Blazer/Blazer Do not use treated plants for feed or forage.
Valor SX/Encompass Do not graze treated fields or feed treated forage or hay to livestock.
Valor XLT Do not graze treated fields or feed treated forage or hay to livestock.
Verdict Do not graze or feed forage, hay, or straw to livestock.
Warrant/Warrant Ultra Do not graze treated area or feed treated soybean forage to livestock following application of this product.
Xtendimax with VaporGrip Allow a minimum of 7 days between application and harvest.
Zidua none
Zidua Pro Do not graze or feed treated soybean forage, hay or straw to livestock.

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REVISED: July 22, 2022