Division of Plant Sciences
Integrated Pest and Crop Management Integrated Pest Management IPM tagline
IPCM print header
IPCM Home  |  

Subscribe / Unsubscribe
Search IPCM Articles

AUTHOR INFORMATION

Kevin Bradley
University of Missouri
Division of Plant Sciences
206a Waters Hall
Columbia, MO 65211
(573) 882-4039
bradleyke@missouri.edu

Considering Your Grazing, Haying, and Silage Options for Herbicide-treated Corn and Soybean

Published: July 19, 2012

With the drought we are currently experiencing in Missouri and throughout much of the Midwest, 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. In other words, it will be critical to know the waiting period that must be followed between application of a given herbicide and the grazing or harvesting of that crop for use as a forage. 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. In soybeans however, most of the product labels DO NOT allow soybeans 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.
HerbicideGrazing RestrictionForage (silage) Restriction
 Time After Application
2,4-D7 days7 days
Accent 30 days 30 days
Aim none none
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
Define none none
Degree 21 days 21 days
Degree Xtra 21 days 21 days
Distinct 32 days 32 days
Duall 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
Ignite 70 days 60 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
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
Shotgun 21 days 21 days
Spirit 30 days 40 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
Touchdown 50 days 50 days
TripleFlex 45 days 45 days
Verdict 80 days 80 days
WideMatch 47 days 47 days
Yukonafter milk stage, at least 30 daysafter milk stage, at least 30 days

 

Table 2. Waiting period before utilizing herbicide-treated soybean for grazing or forage (silage) use.
HerbicideLabel Statement Pertaining to Interval Between Application and Grazing, Haying, or Feeding Herbicide-treated Soybean
2,4-DConsult individual label as product labels can vary. Do not cut for feed treated hay, forage, or fodder or graze treated soybeans to livestock.
AlertDo not allow livestock to graze on treated soybean vines or feed treated vines or vine trash to livestock.
Assure IIDo not graze treated fields or harvest for forage or hay.
Authority AssistDo not feed treated soybean forage, soybean hay or soybean straw to livestock.
Authority FirstDo not feed treated soybean forage or soybean hay to livestock.
Authority MTZDo not graze treated soybean or harvest for forage or hay.
Authority XLDo not feed treated soybean forage or soybean hay to livestock.
BasagranDo not graze or cut treated soybean fields for forage or hay for at least 30 days after the last treatment.
BoundaryDo 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.
CanopyDo not graze treated fields or harvest for forage or hay.
Canopy EXAllow 14 days after application before grazing or feeding forage or hay.
ClassicDo not graze treated fields or harvest for forage or hay.
CobraDo not graze treated fields or harvest for forage or hay.
CommandDo not allow livestock to graze on treated soybean vines or feed treated vines or vine trash to livestock.
DawnDo not graze treated areas or harvest for forage or hay.
Dual II Magnum/CinchDo not graze or feed treated soybean forage, hay, or straw to livestock 30 days following treatment.
ExtremeDo not graze or feed treated soybean forage, hay or straw to livestock.
EncompassDo not graze treated fields or feed treated forage or hay to livestock.
EnliteDo not graze treated fields or harvest for forage or hay.
EnviveDo not graze treated fields or harvest for forage or hay.
FirstRateDo 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 DXDo not graze or harvest for forage or hay.
GangsterDo not graze treated fields or feed treated forage or hay to livestock.
Gramoxone SLPreplant or Pre-emergence: Do not graze or harvest for forage or hay before the R3 stage of soybean development (early pod). Spot Spray and postemergence directed sprays: 46 day forage or hay interval.
HarmonyAllow 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.
IgniteDo not graze the treated crop or cut for hay.
LibertyDo not graze the treated crop or cut for hay.
Op TillDo not graze or feed treated soybean forage, hay or straw to livestock.
Op Till ProDo not graze or feed treated soybean forage, hay or straw to livestock.
OutlookDo not graze or feed forage, hay, or straw to livestock.
PhoenixDo not graze animals on green forage or stubble.  Do not feed treated soybean silage (ensiled soybeans) to cattle. Do not utilize hay or straw for animal feed or bedding.
Poast/Poast PlusOnly 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.
PrefixDo not graze treated areas or harvest for forage or hay.
PursuitDo not graze or feed treated soybean forage, hay or straw to livestock.
PythonDo not graze or feed treated soybean forage, hay or straw to livestock.
RaptorNo grazing or forage restrictions listed.
ResourceDo not graze treated fields or harvest for forage or hay.
RhythmDo not graze treated areas or harvest for forage or hay.
Roundup WeatherMax/other Roundup labels/other glyphosate labelsRoundup 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.
ScepterDo not graze or feed treated soybean forage, hay or straw to livestock.
Select MaxDo not graze treated fields or feed treated forage or hay to livestock.
Sencor/MetribuzinTreated vines may be grazed or fed to livestock 40 days after application.
SequenceDo not feed treated soybean forage or hay for 30 days after application.
SharpenSoybean forage may be fed or grazed 65 or more days after application.
SonicDo not feed treated soybean forage or soybean hay to livestock.
StormDo not allow livestock to graze on treated forage. Do not feed treated vines.
Synchrony XPDo not graze treated fields or harvest for forage or hay.
TreflanConsult product labels.  No apparent grazing or forage restrictions when applied in soybeans.
Touchdown HiTechDo not graze or harvest for forage or hay.
Ultra Blazer/BlazerDo not use treated plants for feed or forage.
Valor SX/EncompassDo not graze treated fields or feed treated forage or hay to livestock.
Valor XLTDo not graze treated fields or feed treated forage or hay to livestock.
VerdictDo not graze or feed forage, hay, or straw to livestock.

Copyright © 2014 — Curators of the University of Missouri. All rights reserved.
Printed from: http://ipm.missouri.edu
E-mail: IPM@missouri.edu