Forage Grass Tolerance to Pasture Herbicides ( Publisher's URL )

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Forage Grass Tolerance to Pasture Herbicides
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Sellers, Brent A.
University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
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Gainesville, Fla.
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Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Melanie Mercer.
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"Original publication date November 2006. Revised January 2008, May 2010, and September 2011."
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SS-AGR-87 Forage Grass Tolerance to Pasture Herbicides1Brent A. Sellers and Jason A. Ferrell2 1. This document is SS-AGR-87, one of a series of the Agronomy Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date November 2006. Revised January 2008, May 2010, and September 2011. Visit the EDIS website at 2. Br ent A. Sellers, associate professor, Agronomy Department, Range Cattle Research and Education Center--Ona, FL; Jason A. Ferrell, associate professor, Agronomy Department; Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, FL 32611. The use of trade names in this publication is solely for the purpose of providing specic information. UF/IFAS does not guarantee or warranty the products named, and references to them in this publication do not signify our approval to the exclusion of other products of suitable composition. All chemicals should be used in accordance with directions on the manufacturers label. Use herbicides safely. Read and follow directions on the manufacturers label. The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or aliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A&M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Millie Ferrer-Chancy, Interim DeanPasture productivity is a key component of cow-calf production systems in Florida. Weeds oen invade and sometimes out-compete desirable forage species. Florida is unique in that many forage grasses are grown to compliment existing grazing systems. For example, Hemarthria (limpograss) is oen grown in areas where drainage is poor, while bahiagrass is grown in most other areas. Some ranchers also grow cultivars of stargrass and/or bermudagrass. Although weed competition varies depending on forage type, an herbicide application is oen needed to keep the pasture at maximum productivity. is publication describes the tolerance of forage cultivars grown in Florida to herbicides currently registered for use in pastures. Not all cultivars of a particular forage species respond similarly to a given herbicide (Table 1). Argentine bahiagrass tolerates most pasture herbicides except Journey and Roundup, while Pensacola may be severely injured by Cimarron, Cimarron Plus, and Cimarron X-tra. All herbicides may be used on stargrass and bermudagrass, with some level of injury from Velpar. Note that Journey is only labeled on Coastal bermudagrass. Hemathria also known as limpograss, is the most sensitive to herbicide applications of all forage grasses grown in Florida. It is important to realize that the response observed from an herbicide application can be variable. For example, the chance for forage injury can increase or decrease as the rate of herbicide applied either increases or decreases. Additionally, environmental conditions such as high temperature and high relative humidity may increase the potential for herbicide injury. For example, we have observed little or no injury to limpograss from 8 pt/acre 2,4-D amine when applied under cooler conditions, while 4 pt/acre in warmer weather caused moderate to severe injury. e response of forages in Table 1 is for established forage cultivars. However, 2,4-D + dicamba (2 pt/acre) can be applied to sprigged forage cultivars, except for limpograss, 7 days aer planting/sprigging. A forage can be considered established when at least 3 tillers are present on bahiagrass or at least 6 inches of new stolon growth is present on sprigged forages.


2Table 1. Tolerance of established (for at least 6 months) forage cultivars to commonly used herbicides. Forage Species Cultivar2,4-D Aim Banvel Chaparral Cimarron Plus Cimarron X-tra Cleanwave GrazonNext HL Impose/Panoramic metsulfuron (MSM 60, others) Milestone Outrider Remedy Ultra, others Roundup/others Pasturegard HL Telar Vista banvel + 2,4-D (WeedMaster, etc.) VelparBahiagrass ArgentineTTTIIITTSITTTSTTTTT PensacolaTTTSSSTTSSTTTSTTTTT Bermudagrass CoastalTTTTTTTTITTTTI-STTTT T-I FlorakirkTTTTTTTTITTTTI-STTTT T-I JiggsTTTTTTTTI-STTTTI-STTTT T-I Tifton-85TTTTTTTTITTTTI-STTTT T-I Brachiaria MulatoTITNNNTTNNTTTSTNTTN Stargrass FloricoTTTTTTTTITTTTI-STTTTNL FloronaTTTTTTTTITTTTI-STTTTNL OkeechobeeTTTTTTTTITTTTI-STTTTNL OnaTTTTTTTTITTTTI-STTTTNL Hemarthria FloraltaI-STTTTT T-I I-S T-I TITISITII-SNL T=tolerant; very little injury if any I=Intermediate; slight injury, will regrow in approximately 1 month S=Severe injury; more than 2 months to recover or complete death N=No current information available NL=Not labelled