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Herbicide Rotation Restrictions inForage and Cover Cropping SystemsDesigning effective herbicide programs while following pesticide label restrictions can be challenging in any cropping system. With rotations thatinclude forage and cover crops, the challenge can be increased—especiallywhen a planned cover crop might be needed as supplemental or emergencyforage. In this case, the best approach is to be aware of crop rotation restrictionsahead of time and plan the most effective solution for all possible scenarios.NPMHerbicide label rotational restrictionsOnce a herbicide is used in a cropping system, the restrictions on that label must be followed for the original crop it isused on AND the succeeding crops until all restrictions on that label have been surpassed. These rotational restrictionsexist for two reasons:1. To protect humans and animals from herbicide residues that a succeeding crop may accumulate at elevatedlabels prior to entering the feed or food chain.2. To ensure good establishment for the following crops by avoiding herbicide carryover injury.An EPA registered pesticide label is a legal document and the instructions must be followed to avoid violating Federal law.Always check the herbicide label for crop rotational restrictions (http://www.cdms.net/LabelsMsds/LMDefault.aspx). Eachcrop will have a rotational planting interval stated in days or months. If a rotational restriction is not listed for a specificcrop, follow the maximum interval. Pay careful attention to any listed exceptions.What is the difference between a forage crop and a cover crop?Simply put, a forage crop is planted for animal feed, which can be either grazed by animals or harvested from the field.A cover crop is planted for a variety of reasons—improving soil health, adding nutrients, suppressing weeds—and is notharvested. Typically, the cover crop’s biomass stays in the field and may be incorporated into the soil.In the legal sense, once the biomass of a cover crop is removed from the field for feed (grazed or harvested), it is considered a forage crop or more precisely a crop, according to the EPA registered pesticide label. It is important to notethat even in situations where cover crops are allowed to be grazed or harvested within a crop insurance or cost-shareprogram, the label restrictions must still be followed.
page 2Some label examplesThe following excerpts are taken directly from registered pesticide labels ample products are strictly for illustration purposes and are not an endorsement of the product.Harness Huskie Cover crop rotational restrictionsMost commonly used corn, soybean, and small grain herbicides do not restrict the rotational planting interval for covercrops. However, the following herbicides have rotational restrictions: Harness and Harness Xtra (can only be used onnon-food winter cover crops), Hornet (10.5 months), Python WDG (9 months). The product information compiled here isintended to be as accurate as possible at the time of printing. Refer to product label for more detailed restriction information. Always follow the product’s current label restrictions and instructions.Forage crop rotational restrictionsThe following tables summarize the rotational restriction interval in months along with specific restrictions for foragesgrown after commonly used herbicide applications in small grains, soybean and corn. Products listed in this publicationare strictly for informational purposes; their inclusion is not an endorsement.
Months to plant forage crops after herbicide application on small grainsBARLEYBUCKWHEATCEREAL RYEOATSPEARL EAFIELD PEAVETCHMAX ROTATION (b)4(b)(b)(b)(b)(b)44444444Buctril ALL1111111111111111Callisto OAffinity BroadSpec B, WDicamba (Clarity) B, O, WPOSTEMERGENCE HERBICIDESLEGUME FORAGE CROPSANNUAL RYEGRASSNON-LEGUME FORAGE CROPS18444001841810181818181818Harmony Extra SG B, O, ny SG B, O, W1.501.51.501.51.501.51.51.51.51.51.51.51.5Huskie B, W11(c)11441(c)4 (d)(c)99(c)99MCPA amine )Orion B, O, W0.50.5120.50.50.530.51291299121212Starane Flex B, O, W0012000301291299121212Starane NXT B, O, W4444444444444444Starane Ultra B, O, W00(e)(e)0(e)00(e)(e)(e)(e)(e)(e)(e)(e)Stinger (f) ALL001800010.50010.5018181818183 (g)13 (g)113 (g)3 (g)3 (g)3 (g)3 (g)3 (g)3 (g)3 (g)3 (g)3 (g)3 (g)2,4-D amine ALLregistered cerealsB barley, O oats, W wheatALL B,O,W, red clover and alfalfaThe product informationcompiled here is intended tobe as accurate as possible atthe time of printing. Refer toproduct label for more detailedrestriction information.Always follow the product’scurrent label restrictions andinstructions.(a) the maximum amount of time required before planting the next crop if itis not listed on the label(b) 15 days per 8 fl oz/acre east of Mississippi River, only count days whenthe ground is not frozen, maximum amount per season is 24 fl oz/acre(c) field bioassay required(d) requires tillage and at least 12 inches of rainfall before planting thenext cropHerbicide Rotation Restrictions in Forage and Cover Cropping Systems(e) no crop rotation restrictions specified(f) rotational interval for soils with greater than 2% organic matter and annualprecipitation exceeding 15 in per year(g) soil temperatures must exceed freezing for the entire time periodpage 3
Months to plant forage crops after herbicide application on soybeanpage 4PREEMERGENCE HERBICIDESBUCKWHEATCEREAL RYEOATSPEARL EAFIELD PEAVETCHMAX ROTATION (a)LEGUME FORAGE CROPSBARLEYPREPLANTINCORPORATEDANNUAL RYEGRASSNON-LEGUME FORAGE CROPSProwl H2O10, 12(m)4 (q)1212121210, 12(m)124(q)1212120121212(f)Trifluralin (Treflan TR-10)12, 14(m)(q)12, 14(m)(q)5512, 14(m)(q)12, 14(m)(q)12, 14(m)(q)5555555512, 14(m)(q)Authority Assist30 (b)9.530 (b)41830 (b)1830 (b)430 (b)1230 (b)30 (b)30 (b)30 (b)30 (b)Authority MTZ1841818181812, 18 (c)18418121818181818Boundary 6.5 EC124.5, 8 (d)1212121212124.5, 8 (d)184.51212121218Dual II magnum124.5(e)4.54.51212124.52 (f)4912121212Enlite (g)4430412309304301212993030Envive j)(j)(j)(j)(j)(j)(j)12(j)(j)(j)(j)(j)12FirstRate )(e)(e)(e)(e)(e)(e)(e)(e)(e)(e)Lorox DF441244120 (f)(l)12444444412Metribuzin 751841818181818184184181881818Metribuzin 75DF184181818418184184181881818OpTill (k)40 (b)9.540 (b)41840 (b)1840 (b)340 (b)441440 (b)40 (b)OpTill PRO (k)40 (b)9.540 (b)41840 (b)1840 (b)440 (b)999440 (b)40 suit40 (b)9.540 (b)41840 (b)1840 (b)440 (b)440040 (b)40 (b)Python WDG949449994264262642626Sharpen (f)(r)6060000006666366Sulfentrazone b)121230(b)30(b)6, 12(q)(s)46, 12(q)(s)45, 10(s)6, 12(q)(s)1 (q)6, 12(q)(s)2 (q)6, 12(q)(s)5, 10(s)5, 10(s)6, 12(q)(s)46, 12(q)(s)6, 12(q)(s)Valor XLT )(j)(j)(j)(j)12(j)(j)(j)(j)(j)12(Authority First DF)Valor (f)
POSTEMERGENCE HERBICIDESAssure (y)(y)(y)(y)(y)(y)(y)(y)(y)Classic (f)33303330153033099993030Extreme (g)409.54041840184034044004040FirstRate (l)(l)(l)(l)(l)18181810101818Flexstar GT 3.518418418181818418181810101818Fusilade up WeatherMax)0000001000000001Harmony SG1.501.51.501.51.5001.51.51.51.51.51.51.5Lactofen )(k)(k)(k)(k)Liberty 280 SL62.32.32.32.3662.32.32.3666666Poast Plus111111111100111140 (b)9.540 (b)41840 (b)1840 (b)440 (b)440040 (b)40 8Resource1111111111111111Select .5(e)49(e)(e)(e)(e)Synchrony XP (f)(g)(i)33303339,15 (f)333099993030Ultra 33.3PursuitRaptorThe product informationcompiled here is intended tobe as accurate as possible atthe time of printing. Refer toproduct label for more detailedrestriction information.Always follow the product’scurrent label restrictions andinstructions.(a) the maximum amount of time required before planting the next crop if it isnot listed on the label(b) requires a field bioassay(c) 12 months for 20 oz per acre or less(d) 4.5 for winter or 8.5 for spring(e) the next crop may be planted the following spring(f) rate restriction(g) region specific(h) fields south of I-90 between Lacrosse and Madison, fields south of I-94between Madison and Milwaukee, see label for other locations(i) soil pH restrictionHerbicide Rotation Restrictions in Forage and Cover Cropping Systems(j)(k)(l)(m)(n)(p)(q)(r)(s)(x)(y)only labeled crops may be planted in rotationno crop rotation restrictions specifiedharvest restrictionrotational crops used for feed must be harvested at maturityno grazing or harvest for forage allowed for the next cropapplication timing specificprecipitation requirementrotation interval does not include days when the ground is frozentillage specificcrop injury could result if a rotation crop is planted immediatelyafter normal harvest, planting of the next crop is allowedpage 5
Months to plant forage crops after herbicide application on cornpage 6PREEMERGENCE HERBICIDESBARLEYBUCKWHEATCEREAL RYEOATSPEARL EAFIELD PEAVETCHMAX ROTATION (a)LEGUME FORAGE CROPSANNUAL RYEGRASSPREPLANTINCORPORATEDNON-LEGUME FORAGE CROPSAcetochlor (Harness)18181818181818184189999918Dual II magnum124.5(b)4.54.51212124.52 (c)4 (c)9 )(e)(e)12Acetanilide atrazine premix(Harness Xtra)1818181818181818499999918Acetochlor (Surpass f)(g)(h)(f)(f)(f)(f)(f)(f)(f)Anthem (c)1818181818181818618101811111818Callisto (i)184440004418101818181818Dicamba (Clarity) (c) (j)(k)(k)4(k)(k)(k)(k)(k)(k)4444444Dual II magnum124.5(b)4.54.51212124.52 )(e)(e)(e)(e)12Hornet nstigate184,9 (g)4,9 (g)4,9 (g)4,9 (g)4,9 (g)10 (l)4,9 (g)4,9 (g)1810 (l)1818181818Lumax )4(b)44(b)(b)(b)4(b)(b)(b)(b)(b)(b)(b)Princep 4 (l)1212121210, 12 (h)124 (l)1212120121212 (c)Prowl H2O 10, 12 (h)Python WDG949449994264262642626Resolve Q (c)189999910,18 (l)93,9 (g)1810,18 (l)10,18 (l)18101818Sharpen (c) (j)6060000006666366Surestart26 (n)(b)26 (n)(b)(b)26 (n)1226 (n)426 (n)18(b)(l)(m)18(b)(l)(m)(b)(b)18(b)(l)(m)26 (n)Valor (c)6, 12 (l)(p)46, 12 (l)(p)45,10 (p)6, 12 (l)(p)1 (l)6, 12 (l)(p)2 (l)6, 12 (l)(p)5,10 (p)5,10 (p)6, 12 (l)(p)46, 12 (l)(p)6, 12 (l)(p)Verdict(b)4 (g)(b)4 (g)4 (g)(b)(b)(b)4 e)(e)(e)(e)(e)12
POSTEMERGENCE HERBICIDES2,4-D LO-V 6E1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)1,3 (j)(q)3 (j)Accent Q10,18 (r)4,8 (g)10,18 (r)4,8 (g)4,8 (g)10,18 (r)10,18 (r)4,8 (g)4,8 (g)10,18 (r)121210,18 (r)10,18 (r)10,18 (r)10,18 (d)(d)(d)(d)(d)(d)(d)(d)(d)(d)(d)(d)(d)Basis Blend (c)183,9 (g)93,9 (g)3,9 (g)3,9 (g)183,9 (g)3,9 o (i)184440004418101818181818Callisto Xtra18(b)181818181818(b)18(b)1818181818Capreno yphosate(Roundup WeatherMax)0000001000000001Halex GT1841844181818418101818181818Harmony SG1.501.51.501.51.5001.51.51.51.51.51.51.5Hornet mpact 101818101818Liberty 280 SL62.32.32.32.3662.32.32.3666666NorthStar183,8 (g)83,8 (g)88883,8 (g)188181881818Option2222222222222222Realm Q (c)184,9 (g)1844,9 (g)1810,18 (l)184,9 (g)1810,18 (l)1818181818Resolve Q (c)189999910,18 (l)93,9 (g)1810,18 (l)10,18 (l)18101818Resource1111111111111111Status41,4 (l)41,4 (l)1,4 (l)4441,4 (l)41,4 (l)44444Steadfast Q10,18 (r)4,8 (g)10,18 (r)4,8 (g)4,8 (g)10,18 (r)10,18 (r)10,18 (r)4,8 (g)10,18 (r)10, 18 (l)10, 18 (l)10,18 (r)1010,18 (r)10,18 (r)Stinger (l)(m)00181801818180010.51818181818Yukon22 (g)362 (g)2 (g)3622212993693636The product informationcompiled here is intended tobe as accurate as possible atthe time of printing. Refer toproduct label for more detailedrestriction information.Always follow the product’scurrent label restrictions andinstructions.(a) the maximum amount of time required before planting the next crop ifit is not listed on the label(b) the next crop may be planted the following spring(c) rate restriction(d) no crop rotation restrictions specified(e) only crops listed on the label may be planted in rotation(f) the next crop may be planted the second following springHerbicide Rotation Restrictions in Forage and Cover Cropping Systems(g) planting date restriction(h) application timing restriction(i) see label for the mesotrione exception- only corn and grainsorghum can be planted as the next rotational crop(j) rotation interval does not include days when the ground is frozen(k) 15 days per 8 fl oz/acre east of Mississippi River(l) precipitation requirement(m)(n)(p)(q)(r)(s)soil organic matter requirementrequires a field bioassaytillage specificrisk of crop injury with the shorter time intervalsoil pH restrictionafter normal harvest, planting of the nextcrop is allowedpage 7
Additional resources:For weed control efficacy ratings consult University of Wisconsin Extension publication A3646 Pest Management in Wisconsin Field Crops, available at http://learningstore.uwex.edu/Is it legal to use a cover crop as a forage crop? Maybe not . . rCrops-used-for-forages.pdfThis publication is available from the Nutrient and PestManagement (NPM) Program. For more copies, pleasecontact us at:Pesticide labels and material safety data sheets (MSDS) can beviewed at nsin Crop Weed Science Research Report http://wcws.cals.wisc.edu/documents/email (npm@hort.wisc.edu)Focus on Forage fact sheets, University of Wisconsin Extension, ge.htmTake Action Herbicide Classification chart http://wcws.cals.wisc.edu/documents/website (ipcm.wisc.edu)Planting winter rye after corn silage: Managing for forage, http://ipcm.wisc.edu/download/pubsNM/Rye 090507 final.pdfGrowing double crop forage after small grains FOF.pdfTake Action on Weeds website, sponsored by the United Soybean Board, http://takeactiononweeds.com/Authors:Elizabeth Bosak, Outreach Specialist and Vince Davis, UWEX Weed ScientistDepartment of Agronomy, University of Wisconsin-Madisonphone (608) 265-2660NPMOctober 2015University of Wisconsin-Extension, College of Agricultural and Life Sciences. An equal opportunity action employer, University of WisconsinExtension provides equal opportunitiesin employment and programming,including Title IX requirements.
Herbicide label rotational restrictions Once a herbicide is used in a cropping system, the restrictions on that label must be followed for the original crop it is used on AND the succeeding crops until all restrictions on
