Vol. 54â2000 - NorthEastern Weed Science Society

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BROADLEAF WEED CONTROL IN 1999 T. L. Watschke and J. A. Borger' ABSTRACT This study was conducted on a mature standof perennial ryegrass at the Landscape Management Researcb Center, Penn State University, University Park, Pa. The objective of the studywas to determinethe efficacyofbroadleafweed herbicideswhen appliedin earlyandlate summerforcontrolof dandelion,conunonplantain,andwhite clover. This study was a randomized complete block design with three replications. All of the treatments were applied on June 7 and August 31, 1999 using a three foot CO, powered boom sprayer calibrated to deliver 40 gpa using two, flat fan, 6504 nozzles at 40 psi. Control of the weeds was rated on August 9 and Oct 6,1999. The treatments were: L-0337, L-0338, Dive, Drive and Momentum, NB20332, NB3040l, NB30402, NB30403, NB20334, NB30405, Trimec Classic, Confront, Momentum, Weed-B-Gone, Acclaim Extra and Confront, Preclaim and Confront. Applicationsof the commercialstandardsMomentum,TrimecClassic, Confront,and weed-Bajcoe resultedin very good to excellentcontrolof white clover andcommonplantain bowever, all of the standards had relatively poor control of dandelion when rated on Aug 9. Observation of the dandelions 4 to 6-weeks after application revealed apparent good control. However, by the eight-week rating date, many of the dandelions had resprouted from the taproot. All of the treatmentshadsome level of controlof commonplantainandwhiteclover, butall had limited control of dandelion. Of the series, NB20334 appeared to have best range of control acrossthe threeweed speciesbutstillnot acceptableon dandelion.Theadditionof Acclaim Extra to Confront did not appear to antagonize efficacy as Acclaim or Preclaim. Drive provided excellent control of white clover by itself. Combining Drive with Momentum (L0338) improved common plantain control slightly. Tank mixing Drive and Momentum resulted in improved dandelioncontrolcomparedto Momentumalone,butthecontrolof white cloverwas decreased. All treatments were reapplied on Aug 31 and a second rating for control was made on Oct 6. All treatments provided acceptable dandelion control except NB30405, and the combination of Preclaim and Confront. All treatments provided acceptable plantain control except L-0337 (Drive 0) Drive. Only NB30405 failed to provide acceptable control of white clover. I ProfessorandResearchAssistant,respectively,Departmentof Agronomy,Penn State University, University Park, Pa, 16802 106
CONTROL OF DALLISGRASS IN COOL SEASON TURF C. E. Jentes', R. D. Bullock',D. W. Williams', J.B. Breuninger', and R.B. Cooper' ABSlRACT Experiments were conducted in Missouri, Kentucky and Tennessee in 1998 and 1999 to test the efficacy of triclopyr in controlling dallisgrass (Paspalwn di1atatwn). This research was based on 1997 observations by Bullock in Tennessee. Tests conducted in 1998 were initiated to confirmthe activity and identify the best formulationand applicationmethod. Naturalinfestationsof dallisgrassin cool seasonturfgrasseswere sprayed using a CO 2 backpack sprayer. Results from 1998 confirmed the effectiveness of triclopyr (Turflon Ester) in controlling dallisgrass with greater than 80% control 10 weeks after treatment (WAT). In 1999, application timing and tankmixpartners weretested. Results in 1999 showed that repeat applications ofTurflon Ester two weeks apart beginning in June after dallisgrass approached full greenup provided 100% control ofdallisgrass 6 WAT. Turflon Ester at the rate of 1.0 lb. aiJA provided the most consistentcontroloverthetestingperiod,andsequentialapplicationsproducednearly 100%controlin thefirstseasonof use. No injurywas observedon tall fescuehowever transientinjurywas observedwhenKentuckybluegrasswas treatedin thesummerwith high rates oftriclopyr. (SeniorScientist,Dow AgroSciences,St. Louis, MO,63146 2 Universityof TennesseeAgriculturalExtensionService,Nashville,IN, 37211 'University of Kentucky, Lexington, KY, 40546 4 SeniorAdvisor,Dow AgroSciences,HiltonHead,SC, 29938 , Senior Scientist, Dow AgroSciences, Indianapolis, IN 46268 107
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WEED REMOVAL TIMING WITH ROUNDUP RE
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EFFECT OF HERBICIDE RATES AND IRRIG
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40 Effect of Pronone Applied with A
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Comparisonof Sulfosateand Glyphosat
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N 1175 feet Roundup Ready Studies R
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VIRGINIA TECH'S ONLINE WEED IDENTIF
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WEED CONTROL AND YIELD OF CUT FLOWE
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Table I. Effect of napropamide and
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The Effect of Total Postemergence H
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with commercial fertilizer. In gene
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HERBICIDE APPLICATIONS VERSUS HANDW
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exceeded 4. The success of training
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_u ____ Table2: Estimatesof herbace
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DOUBLE CROP CORN WEED CONTROL IN VI
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ANNUAL WEED AND GRASS CONTROL IN CO
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MANAGING QUACKGRASSINFESTATIONSAS C
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USING HERBICIDE RESISTANT HYBRIDS T
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NICOSULFURONIRIMSULFURON COMBINATIO
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GLYPHOSATE ALONE AND PRECEDED BY PR
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ROUNDUPVS. LIBERTY:WHATHAVE WE LEAR
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In summary, application timing for
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INFLUENCE OF TIMING ON WEED MANAGEM
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IMPACT OF GLYPHOSATE TIMING AND COR
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PREEMERGENCE HERBICIDES INFLUENCE W
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COMPARISON OF WEED CONTROL SYSTEMS
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Table I Mean Percent Weed Control V
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SMALL GRAIN WEED CONTROL - NEW WEED
Page 55 and 56: MODE OF ACTION, ABSORPTION, TRANSLO
Page 57 and 58: INFLUENCE OF CROWNVETCH WITH AND WI
Page 59 and 60: lRUMPETCREEPER, HONEYVINEMILKWEED,A
Page 61 and 62: FLUFENACET PLUS METRIBUZIN PLUS ATR
Page 63 and 64: CONTROLLING ASTERACEAE WEEDS WITH R
Page 65 and 66: 0... Figure1. GerminationRateof Roo
Page 67 and 68: BIOLOGICALLY BASED WEED CONTROL STR
Page 69 and 70: NON·NATIVE VASCULAR FLORA OF BISCA
Page 71 and 72: principally in ruderal sites. lawns
Page 73 and 74: EVALUATION OF AZAFENlDIN FOR PREEME
Page 75 and 76: AUTOMATING MONITORING OF ROADSIDE W
Page 77 and 78: Table I: Swnmary of brush managemen
Page 79 and 80: Table I: Sequence codes and general
Page 81 and 82: IR-4 ORNAMENTAL RESEARCH PROGRESS F
Page 83 and 84: personnel with many of the illegal
Page 85 and 86: TOLERANCE OF ORNAMENTAL GROUNDCOVER
Page 87 and 88: MUGWORT CONTROL WITH CLOPYRALID AND
Page 89 and 90: POTENTIAL WEEDINESS OF SEVERAL NEW
Page 91 and 92: Table I: Identification, morphologi
Page 93 and 94: Trifolium tricolor 232 26 62 0 18 S
Page 95 and 96: NUTRIENT REMOVAL BY WEEDS IN CONTAI
Page 97 and 98: CONTROL OF POAANNUA FROM MULTIPLE S
Page 99 and 100: ANNUAL BLUEGRASS (PDaannual CONTROL
Page 101 and 102: LATERAL DEVELOPMENT OF PLANT oaowra
Page 103 and 104: RE-ROOTING OF FOUR VARIETIES OF CRE
Page 105: Table 2. Top growth weights (fresh)
Page 109 and 110: Kentucky bluegrass was rated to hav
Page 111 and 112: Table 2. Fresh weight (grams) barve
Page 113 and 114: MANAGING FENOXAPROP RESIST ANT CRAB
Page 115 and 116: ADVANCED FORMULATION TECHNOLOGY FOR
Page 117 and 118: Table I. Preemergence smooth crabgr
Page 119 and 120: 0.57EW at O.l21bs ai/A plus Confron
Page 121 and 122: EFFICACY OF DITHIOPYR FORMULATIONS
Page 123 and 124: EFFECTS OF DROUGHT ON THE INTERFERE
Page 125 and 126: WEED MANAGEMENT WITH HALOSULFURON I
Page 127 and 128: WEED CONTROL IN SWEET CORN WITH CAR
Page 129 and 130: COMPARISON OF USING LEAF AREA AND W
Page 131 and 132: RESULTS OF NEW YORK VINEYARD TRIALS
Page 133 and 134: HERBICIDE TOLERANCE IN CRANBERRIES
Page 135 and 136: Classification based on action on a
Page 137 and 138: EFFECTS OF SEVERAL POTENTIALLY USEF
Page 139 and 140: Supplement of the 53 rd Annual Meet
Page 141 and 142: with society activities to anyone.
Page 143 and 144: WINTER SQUASH CULTIVARS DIFFER IN R
Page 145 and 146: INCORPORATING QUINCLORAC IN AUTUMN
Page 147 and 148: Control efforts aim to eradicate bo
Page 149 and 150: Table I Weed canopy, insect and dis
Page 151 and 152: Table 1: Percent mortality of respr
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Vol. 54â2000 - NorthEastern Weed Science Society

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Vol. 54â2000 - NorthEastern Weed Science Society