Baldwin, Ford

Beaty, Dwayne

Dillon, Tomilea

Gealy, David

Norsworthy, Jason

Schmidt, Lance

Talbert, Ron

Webster, Eric

English

ScholarWorks@UARK

University of Arkansas, FayettevilleScholarWorks@UARKResearch Series Arkansas Agricultural Experiment Station10-1-1997Herbicide Evaluation in Arkansas Rice, 1996Eric WebsterUniversity of Arkansas, FayettevilleRon TalbertUniversity of Arkansas, FayettevilleFord BaldwinUniversity of Arkansas, FayettevilleDavid GealyUniversity of Arkansas, FayettevilleTomilea DillonUniversity of Arkansas, FayettevilleSee next page for additional authorsFollow this and additional works at: https://scholarworks.uark.edu/aaesserPart of the Agricultural Science Commons, Agronomy and Crop Sciences Commons, BotanyCommons, Horticulture Commons, and the Weed Science CommonsThis Report is brought to you for free and open access by the Arkansas Agricultural Experiment Station at ScholarWorks@UARK. It has been acceptedfor inclusion in Research Series by an authorized administrator of ScholarWorks@UARK. For more information, please contact scholar@uark.edu,ccmiddle@uark.edu.Recommended CitationWebster, Eric; Talbert, Ron; Baldwin, Ford; Gealy, David; Dillon, Tomilea; Norsworthy, Jason; Schmidt, Lance; and Beaty, Dwayne,"Herbicide Evaluation in Arkansas Rice, 1996" (1997). Research Series. 146.https://scholarworks.uark.edu/aaesser/146AuthorsEric Webster, Ron Talbert, Ford Baldwin, David Gealy, Tomilea Dillon, Jason Norsworthy, Lance Schmidt,and Dwayne BeatyThis report is available at ScholarWorks@UARK: https://scholarworks.uark.edu/aaesser/146HERBICIDE EVALUATION IN ARKANSAS RICE, 1996Eric WebsterExtension Weed ScientistSoutheast Research andExtension CenterRon TalbertUniversity ProfessorDepartment of AgronomyFord BaldwinExtension Weed ScientistCooperative Extension ServiceDavid GealyUSDA-ARS Plant PhysiologistNational Rice Germplasm Evaluation andEnhancement CenterTomilea DillonAssistant SpecialistCooperative ExtensionServiceJason NorsworthyGraduate AssistantDepartment of AgronomyLance SchmidtResearch AssistantDepartment of AgronomyDwayne BeatyResearch SpecialistSoutheast Research and Extension CenterArkansas Agricultural Experiment Station Fayetteville, Arkansas 72701CONTENTSPageIntroduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Methods and Results  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Abbreviations .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Tables  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Triclopyr (Grandstand) and propanil (Stam M-4) weed control in rice, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Post-flood application timing of triclopyr (Grandstand) following fenoxaprop (Whip), Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Evaluation of lactofen (Cobra) applied delayed preemergence, Rohwer, . . . . . . . . . . . . . . . . . . . 8Delayed preemergence and postemergence combinations for rice weed control, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Potential salvage treatments for rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Thiobencarb (Bolero) timings and combinations for broadleaf and grass control, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Pendimethalin (Prowl) combinations for rice weed control, Rohwer  . . . . . . . . . . . . . . . . . . . . 19Quinclorac (Facet) formulations for grass control in rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . 21Early season grass control in rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Postemergence grass control in rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26V10029 for weed control in rice, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Preemergence weed controlin rice, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Propanil formulations with reduced rates of quinclorac (Facet), Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Delayed-preemergence mixtures for resistant barnyardgrass, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Quinclorac (Facet) formulations for grass control in rice, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41F-8426 (carfentrazone) postemergence in rice, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Clomazone (Command) for resistant barnyardgrass control in rice, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Molinate (Ordram) and propanil (Stam) mixtures for barnyardgrass control, Stuttgart,  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Halosulfuron (Permit), bensulfuron (Londax), and triclopyr (Grandstand) for nutsedge and aquatics in rice, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 50Control of weeds with triclopyr (Grandstand) - Test 1, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 53Control of weeds with triclopyr (Grandstand) - Test 2, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 55Herbicide antagonism with fipronil, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Control of propanil-resistant and -susceptible barnyardgrass, Stuttgart . . . . . . . . . . . . . . . . . . . 59Control of propanil-resistant and -susceptible barnyardgrass, Lonoke  . . . . . . . . . . . . . . . . . . . 62Potential synergistic effects of herbicides and insecticides with propanil (7 experiments), Fayetteville  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65Glufosinate (Liberty)-tolerant rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77Clomazone (Command) and quinclorac (Facet) combinations in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80Lactofen (Cobra) for weed control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83Propanil (Stam) combinations for grass control in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . 85Postemergence grass control in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88Herbicide combinations with V10029 in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90Broadleaf and grass control in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94Herbicide Evaluation in Arkansas Rice, 1996Herbicide programs for rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97Preemergence weed control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101Early season grass control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104Quinclorac (Facet) formulations for grass control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . 108Pendimethalin (Prowl) combinations for weed control in rice, Lonoke . . . . . . . . . . . . . . . . . . 110Strawhull red rice control in glufosinate (Liberty)-tolerant rice, Stuttgart  . . . . . . . . . . . . . . . . 112Response of blackhull and strawhull red rice to soybean herbicidetreatments, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Control of propanil-resistant barnyardgrass (Year 1), Stuttgart, (1995)  . . . . . . . . . . . . . . . . . 116Control of propanil-resistant barnyardgrass (Year 2), Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 119Appendix Tables  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122(Plant names, herbicide names, and climatological data)ACKNOWLEDGMENTS The authors acknowledge the Arkansas Rice Research and Promotion Board for financialsupport for some of these experiments. The following companies also provided financial supportand chemicals used in the studies: AgrEvo, BASF, Cedar, Cyanamid, DowElanco, DuPont,FMC, Helena, Monsanto, Rhone-Poulenc, Rohm & Haas, Terra, UAP, Valent and Zeneca.The assistance of the following individuals is gratefully acknowledged: Howard Black,Biological Technician, National Rice Germplasm Evaluation and Enhancement Center; MikeDillon, Research Technician, Lonoke; Troy Dillon, Research Technician, Lonoke; Larry Earnest,Superintendent, Southeast Branch Station, Rohwer; Bill Fox, Research Specialist, Rice Researchand Extension Center, Stuttgart; Toby Hedges, hourly assistant; Vann Langston, hourly assistant;John Robinson, Director, Rice Research and Extension Center, Stuttgart; Vaughn Skinner, FarmManager, Main Experiment Station, Fayetteville; Randy Spurlock, Research Technician, Rohwer;Celeste Wheeler, Research Technician, Lonoke; Sunny Wilkerson, hourly assistant, Lonoke;Marilyn McClelland, Research Associate, Main Experiment Station, Fayetteville (editing andcompilation); and Marci Milus and Jody Edwards, secretarial staff.Arkansas Agricultural Experiment Station Research Series 457HERBICIDE EVALUATION IN ARKANSAS RICE, 1996Eric Webster, Ron Talbert, Ford Baldwin, David Gealy,Tomilea Dillon, Jason Norsworthy, Lance Schmidt and Dwayne Beaty INTRODUCTIONHerbicidal weed control is economically important for production of rice. Fieldexperiments are conducted annually in Arkansas to evaluate the activity of developmental andcommercial herbicides for selective control of weeds in rice. These experiments serve bothindustry and Arkansas agriculture by providing information on the selectivity of herbicides still inthe developmental stage and by comparing the activity of these new herbicides with that ofrecommended herbicides.The research reported herein is a compilation of data from experiments conducted by fourof the state's agronomic researchers responsible for weed control in rice. Eric Webster is located atthe Southeast Research and Extension Center at Monticello and conducts rice research at theSoutheast Branch Experiment Station at Rohwer. Ron Talbert, located at the Main ExperimentStation, Fayetteville, conducts research at Fayetteville, at the Rice Research and Extension Center,Stuttgart, and at the Lonoke location of the University of Arkansas at Pine Bluff. Ford Baldwin'srice research is located primarily at the Lonoke location of the University of Arkansas at PineBluff, and David Gealy is located at the National Rice Germplasm Evaluation and EnhancementCenter at Stuttgart.Common names of herbicides presented in data tables are referenced to trade names andsponsoring companies in Appendix Table 1. The scientific names of the plants evaluated and theirassociated Bayer codes are listed in Appendix Table 2. Climatological data for 1996 are presentedin Appendix Table 3.METHODSPertinent information specific to each field test precedes each data table. Included isinformation on general field conditions, field maintenance, and herbicide application and generalconclusions from the data. All test areas were fertilized as recommended from soil tests.Experiments at Lonoke were fertilized before planting with chicken litter at 200 pounds/acre(lb/A), which was incorporated lightly into the soil with a field cultivator.The herbicides used in these studies are designated in the tables by the common nameproposed to or accepted by the Weed Science Society of America or, when common names areunavailable, by code number designation. A trade name is specified for compounds having morethan one trade name or manufacturer. The Stam® formulation was used where propanilformulation is not designated. Herbicides formulated as pre-packaged mixtures are listed in tablesby their component herbicides in parentheses. All herbicide rates are expressed in pounds of activeingredient or the acid equivalent per acre (lb/A) on a broadcast basis. Adjuvant rates are expressedas percent volume/volume.Effects of the herbicide treatments were evaluated by weed control ratings, crop injuryratings, crop yields, and crop stand counts. Percentages of weed control and crop injury werevisually estimated: 0% represents no effect, and 100% represents complete kill. Rice yield isreported as lb/A; 1 bushel = 45 pounds. Data were subjected to analysis of variance, and the LSDHerbicide Evaluation in Arkansas Rice, 1996(Least Significant Difference) test at the 5% level of significance was used for separation of means.ABBREVIATION OF TERMSThe following abbreviations are used in tables:BkPkCO2, CO2 backpack sprayer CEC, cation exchange capacity of soil Cot., cotyledon DAT, days after treatment DF, dry flowable DPF, days prior to flood DPRE, delayed preemergence EC, emulsifiable concentrate EPOST, early postemergence fb, followed by FF, flat fan nozzle G, granular formulation Gpa, gallons per acre LF, leaf LPOST, late postemergence LSD, least significant difference ME, microencapsulated MP-44, annual weed control recommendations for Arkansas MPOST, mid-postemergence timing N/A, not applicable PI, panicle initiation POST, postemergence POSTFLD, after flood PPI, preplant incorporated PRE, preemergence PREFLD, before flood RCB, randomized complete block (experimental design) UAPB, University of Arkansas at Pine BluffWAF, weeks after flood XR, extended range nozzle

Herbicide Evaluation in Arkansas Rice, 1996

UARK (University of Arkansas )

University of Arkansas, Fayetteville ScholarWorks@UARK Arkansas Agricultural Experiment Station Research Series Arkansas Agricultural Experiment Station 10-1-1997 Herbicide Evaluation in Arkansas Rice, 1996 Eric Webster University of Arkansas, Fayetteville Ron Talbert University of Arkansas, Fayetteville Ford Baldwin University of Arkansas, Fayetteville David Gealy University of Arkansas, Fayetteville Tomilea Dillon University of Arkansas, Fayetteville See next page for additional authors Follow this and additional works at: https://scholarworks.uark.edu/aaesser  Part of the Agricultural Science Commons, Agronomy and Crop Sciences Commons, Botany Commons, Horticulture Commons, and the Weed Science Commons Citation Webster, E., Talbert, R., Baldwin, F., Gealy, D., Dillon, T., Norsworthy, J., Schmidt, L., & Beaty, D. (1997). Herbicide Evaluation in Arkansas Rice, 1996. Arkansas Agricultural Experiment Station Research Series. Retrieved from https://scholarworks.uark.edu/aaesser/146 This Report is brought to you for free and open access by the Arkansas Agricultural Experiment Station at ScholarWorks@UARK. It has been accepted for inclusion in Arkansas Agricultural Experiment Station Research Series by an authorized administrator of ScholarWorks@UARK. For more information, please contact scholar@uark.edu. Authors Eric Webster, Ron Talbert, Ford Baldwin, David Gealy, Tomilea Dillon, Jason Norsworthy, Lance Schmidt, and Dwayne Beaty This report is available at ScholarWorks@UARK: https://scholarworks.uark.edu/aaesser/146 HERBICIDE EVALUATION IN ARKANSAS RICE, 1996Eric WebsterExtension Weed ScientistSoutheast Research andExtension CenterRon TalbertUniversity ProfessorDepartment of AgronomyFord BaldwinExtension Weed ScientistCooperative Extension ServiceDavid GealyUSDA-ARS Plant PhysiologistNational Rice Germplasm Evaluation andEnhancement CenterTomilea DillonAssistant SpecialistCooperative ExtensionServiceJason NorsworthyGraduate AssistantDepartment of AgronomyLance SchmidtResearch AssistantDepartment of AgronomyDwayne BeatyResearch SpecialistSoutheast Research and Extension CenterArkansas Agricultural Experiment Station Fayetteville, Arkansas 72701CONTENTSPageIntroduction  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1Methods and Results  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Abbreviations .  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3Tables  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Triclopyr (Grandstand) and propanil (Stam M-4) weed control in rice, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Post-flood application timing of triclopyr (Grandstand) following fenoxaprop (Whip), Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Evaluation of lactofen (Cobra) applied delayed preemergence, Rohwer, . . . . . . . . . . . . . . . . . . . 8Delayed preemergence and postemergence combinations for rice weed control, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Potential salvage treatments for rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Thiobencarb (Bolero) timings and combinations for broadleaf and grass control, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Pendimethalin (Prowl) combinations for rice weed control, Rohwer  . . . . . . . . . . . . . . . . . . . . 19Quinclorac (Facet) formulations for grass control in rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . 21Early season grass control in rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Postemergence grass control in rice, Rohwer  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26V10029 for weed control in rice, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28Preemergence weed controlin rice, Rohwer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Propanil formulations with reduced rates of quinclorac (Facet), Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Delayed-preemergence mixtures for resistant barnyardgrass, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Quinclorac (Facet) formulations for grass control in rice, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41F-8426 (carfentrazone) postemergence in rice, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43Clomazone (Command) for resistant barnyardgrass control in rice, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Molinate (Ordram) and propanil (Stam) mixtures for barnyardgrass control, Stuttgart,  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48Halosulfuron (Permit), bensulfuron (Londax), and triclopyr (Grandstand) for nutsedge and aquatics in rice, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 50Control of weeds with triclopyr (Grandstand) - Test 1, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 53Control of weeds with triclopyr (Grandstand) - Test 2, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 55Herbicide antagonism with fipronil, Stuttgart  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57Control of propanil-resistant and -susceptible barnyardgrass, Stuttgart . . . . . . . . . . . . . . . . . . . 59Control of propanil-resistant and -susceptible barnyardgrass, Lonoke  . . . . . . . . . . . . . . . . . . . 62Potential synergistic effects of herbicides and insecticides with propanil (7 experiments), Fayetteville  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65Glufosinate (Liberty)-tolerant rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77Clomazone (Command) and quinclorac (Facet) combinations in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80Lactofen (Cobra) for weed control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83Propanil (Stam) combinations for grass control in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . 85Postemergence grass control in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88Herbicide combinations with V10029 in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90Broadleaf and grass control in rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94Herbicide Evaluation in Arkansas Rice, 1996Herbicide programs for rice, Lonoke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97Preemergence weed control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101Early season grass control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104Quinclorac (Facet) formulations for grass control in rice, Lonoke  . . . . . . . . . . . . . . . . . . . . . 108Pendimethalin (Prowl) combinations for weed control in rice, Lonoke . . . . . . . . . . . . . . . . . . 110Strawhull red rice control in glufosinate (Liberty)-tolerant rice, Stuttgart  . . . . . . . . . . . . . . . . 112Response of blackhull and strawhull red rice to soybean herbicidetreatments, Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Control of propanil-resistant barnyardgrass (Year 1), Stuttgart, (1995)  . . . . . . . . . . . . . . . . . 116Control of propanil-resistant barnyardgrass (Year 2), Stuttgart . . . . . . . . . . . . . . . . . . . . . . . . 119Appendix Tables  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122(Plant names, herbicide names, and climatological data)ACKNOWLEDGMENTS The authors acknowledge the Arkansas Rice Research and Promotion Board for financialsupport for some of these experiments. The following companies also provided financial supportand chemicals used in the studies: AgrEvo, BASF, Cedar, Cyanamid, DowElanco, DuPont,FMC, Helena, Monsanto, Rhone-Poulenc, Rohm & Haas, Terra, UAP, Valent and Zeneca.The assistance of the following individuals is gratefully acknowledged: Howard Black,Biological Technician, National Rice Germplasm Evaluation and Enhancement Center; MikeDillon, Research Technician, Lonoke; Troy Dillon, Research Technician, Lonoke; Larry Earnest,Superintendent, Southeast Branch Station, Rohwer; Bill Fox, Research Specialist, Rice Researchand Extension Center, Stuttgart; Toby Hedges, hourly assistant; Vann Langston, hourly assistant;John Robinson, Director, Rice Research and Extension Center, Stuttgart; Vaughn Skinner, FarmManager, Main Experiment Station, Fayetteville; Randy Spurlock, Research Technician, Rohwer;Celeste Wheeler, Research Technician, Lonoke; Sunny Wilkerson, hourly assistant, Lonoke;Marilyn McClelland, Research Associate, Main Experiment Station, Fayetteville (editing andcompilation); and Marci Milus and Jody Edwards, secretarial staff.Arkansas Agricultural Experiment Station Research Series 457HERBICIDE EVALUATION IN ARKANSAS RICE, 1996Eric Webster, Ron Talbert, Ford Baldwin, David Gealy,Tomilea Dillon, Jason Norsworthy, Lance Schmidt and Dwayne Beaty INTRODUCTIONHerbicidal weed control is economically important for production of rice. Fieldexperiments are conducted annually in Arkansas to evaluate the activity of developmental andcommercial herbicides for selective control of weeds in rice. These experiments serve bothindustry and Arkansas agriculture by providing information on the selectivity of herbicides still inthe developmental stage and by comparing the activity of these new herbicides with that ofrecommended herbicides.The research reported herein is a compilation of data from experiments conducted by fourof the state's agronomic researchers responsible for weed control in rice. Eric Webster is located atthe Southeast Research and Extension Center at Monticello and conducts rice research at theSoutheast Branch Experiment Station at Rohwer. Ron Talbert, located at the Main ExperimentStation, Fayetteville, conducts research at Fayetteville, at the Rice Research and Extension Center,Stuttgart, and at the Lonoke location of the University of Arkansas at Pine Bluff. Ford Baldwin'srice research is located primarily at the Lonoke location of the University of Arkansas at PineBluff, and David Gealy is located at the National Rice Germplasm Evaluation and EnhancementCenter at Stuttgart.Common names of herbicides presented in data tables are referenced to trade names andsponsoring companies in Appendix Table 1. The scientific names of the plants evaluated and theirassociated Bayer codes are listed in Appendix Table 2. Climatological data for 1996 are presentedin Appendix Table 3.METHODSPertinent information specific to each field test precedes each data table. Included isinformation on general field conditions, field maintenance, and herbicide application and generalconclusions from the data. All test areas were fertilized as recommended from soil tests.Experiments at Lonoke were fertilized before planting with chicken litter at 200 pounds/acre(lb/A), which was incorporated lightly into the soil with a field cultivator.The herbicides used in these studies are designated in the tables by the common nameproposed to or accepted by the Weed Science Society of America or, when common names areunavailable, by code number designation. A trade name is specified for compounds having morethan one trade name or manufacturer. The Stam® formulation was used where propanilformulation is not designated. Herbicides formulated as pre-packaged mixtures are listed in tablesby their component herbicides in parentheses. All herbicide rates are expressed in pounds of activeingredient or the acid equivalent per acre (lb/A) on a broadcast basis. Adjuvant rates are expressedas percent volume/volume.Effects of the herbicide treatments were evaluated by weed control ratings, crop injuryratings, crop yields, and crop stand counts. Percentages of weed control and crop injury werevisually estimated: 0% represents no effect, and 100% represents complete kill. Rice yield isreported as lb/A; 1 bushel = 45 pounds. Data were subjected to analysis of variance, and the LSDHerbicide Evaluation in Arkansas Rice, 1996(Least Significant Difference) test at the 5% level of significance was used for separation of means.ABBREVIATION OF TERMSThe following abbreviations are used in tables:BkPkCO2, CO2 backpack sprayer CEC, cation exchange capacity of soil Cot., cotyledon DAT, days after treatment DF, dry flowable DPF, days prior to flood DPRE, delayed preemergence EC, emulsifiable concentrate EPOST, early postemergence fb, followed by FF, flat fan nozzle G, granular formulation Gpa, gallons per acre LF, leaf LPOST, late postemergence LSD, least significant difference ME, microencapsulated MP-44, annual weed control recommendations for Arkansas MPOST, mid-postemergence timing N/A, not applicable PI, panicle initiation POST, postemergence POSTFLD, after flood PPI, preplant incorporated PRE, preemergence PREFLD, before flood RCB, randomized complete block (experimental design) UAPB, University of Arkansas at Pine BluffWAF, weeks after flood XR, extended range nozzle

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Herbicide Evaluation in Arkansas Rice, 1996

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