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Quick Guide to Herbicide Injury on Soybean

Quick Guide to Herbicide Injury onSoybeanPlant Growth Regulators Ex. dicamba, 2,4-D, 2,4-DB, and clopyralidProtox(PPO)Inhibitors Ex. lactofen, fome-safen, carfentrazone, and acifl uorfen Amino Acid Synthesis Inhibitors Ex. imazethapyr, clo-ransulam, chlorimu-ron, and glyphosatePhotosystem I and II Inhibitors Ex. atrazine, bentazon, metribuzin, and paraquatOthers Ex. trifl uralin, quiza-lofop, glufosinate, me-sotrione, acetochlor, and S-metolachlorImages are identifi ed on the back of 3-3 June 2005 AAAABCBBBCDDCCDDABCDand S-metolachlorQuick Guide to Herbicide Injury on SoybeanPlant Growth Regulator Images:A) dicambaB) dicambaC) clopyralidD) severe cuppingInjury Symptoms: Injury is fi rst noticed on newly developed tissue or and inhibition of roots; improper root in xylem and and cupped leaves; strapping of veins; paralle of stems and petioles (epinasty).

Quick Guide to Herbicide Injury on Soybean Plant Growth Regulator Images: A) dicamba B) dicamba C) clopyralid D) severe cupping Injury Symptoms: Injury is …

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Transcription of Quick Guide to Herbicide Injury on Soybean

1 Quick Guide to Herbicide Injury onSoybeanPlant Growth Regulators Ex. dicamba, 2,4-D, 2,4-DB, and clopyralidProtox(PPO)Inhibitors Ex. lactofen, fome-safen, carfentrazone, and acifl uorfen Amino Acid Synthesis Inhibitors Ex. imazethapyr, clo-ransulam, chlorimu-ron, and glyphosatePhotosystem I and II Inhibitors Ex. atrazine, bentazon, metribuzin, and paraquatOthers Ex. trifl uralin, quiza-lofop, glufosinate, me-sotrione, acetochlor, and S-metolachlorImages are identifi ed on the back of 3-3 June 2005 AAAABCBBBCDDCCDDABCDand S-metolachlorQuick Guide to Herbicide Injury on SoybeanPlant Growth Regulator Images:A) dicambaB) dicambaC) clopyralidD) severe cuppingInjury Symptoms: Injury is fi rst noticed on newly developed tissue or and inhibition of roots; improper root in xylem and and cupped leaves; strapping of veins; paralle of stems and petioles (epinasty).

2 PPO Inhibitor Images:A) fomesafenB) sulfentrazoneC) carfentrazoneD) fl umioxazinInjury Symptoms: Little translocation following foliar leaf burn from foliar application. Leaf crinkling and plant stunting. Injury typically increased with humidity and lesions from soil-applied Acid Inhibitor Images:A) thifensulfuronB) chlorimuronC) prosulfuronD) glyphosateInjury Symptoms:Translocated in xylem and phloem. Stunted development of symptoms following foliar yellowing or chlorosis of leaf to dark red veination on the underside of resemble potassium defi ciency of Soybean cyst nematode. Photosystem I and II Inhibi-tor Images:A) metribuzinB) paraquatC) bentazonD) atrazineInjury SymptomsInjury SymptomsInjury Sym:Little (xylem) to no translocation following foliar : leaf margin burn and interveinal chlorosis; older leaves affected fi : Water-soaked early; chlorosis and necrosis of leaf tissue; exposure via drift occurs as speckling; symptoms develop : Necrotic spots, speckled chlorosis, or bronzing.

3 Symptoms often increase in severity with increased humidity and air temperature. OthersImages:A) S-metolachlorB) quizalofopC) isoxafl utoleD) mesotrioneInjury Symptoms:Pigment Inhibitors: Bleaching and whitening of plants; eventual : Leaf crinkling and : Leaf crinkling and puckering; : Swollen and cracked hypocotyls; stunted plants; crinkled leaves; Callus tissue from soil splash; may cause lodging and breakage; stubby can vary depending on the respective Herbicide and the route (soil or foliar) of Soybean exposure to the : Dawn Nordby and Aaron Hager June 2005 University of Illinois Weed Science Extension Department of Crop SciencesD) mesotrio


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