Vol. 54â2000 - NorthEastern Weed Science Society

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Country Club, the fall applications (three times at 0.75 Ib ailA) used as a reference reduced Poa annua by 92%. Results from the 1999 study at the Valentine Center showed that increasing the rateof ethofumesateto 1.5 lb ailA foreachapplicationdidnotimprovecontrol.Ethofwnesate appliedeighttimesat O.751bsai/Aresultedin a 64%reductionin Poa annuafromMay5 to the Aug 31 rating date. Additions of urea and Sprint tended to reduce (antagonize) control at all rates. 98
ANNUAL BLUEGRASS (PDaannual CONTROL WITH ETHOFUMESA TE S.E. Hart and D.W. Lycan' ABSTRACT Field Experimentswereconductedin 1999attheRutgersUniversity Experimental Horticultura1 Farm II in New Brunswick NJ and the Little Mill Country Club in Marlton NJ to evaluate spring and summer applications of ethofumesate for control of annual bluegrass in bentgrass fairways maintained at a mowing height of 9 mm. At Horticultura1 Farm II the turfwas colonial bentgrass (Agrostis tenuis) variety 'SR 7100' infested with approximately 40% P. annua while the turfat Little Mill was a mixtureof unknownvarietiesof creepingbentgrass(Agrostispalustris)andperennial ryegrass (Lolium perenne} infested with approximately 60% P. annua. Ethofumesate applicationswere initiatedon AprilS andapplied8 timesatapproximately3-week intervals throughout the spring and summer. Ethofumesate was applied four times at 1.7, 1.1 or 0.8 kg aiJh followed by four applications at 0.8,0.6 or 0.4 kgIh, respectively. All ethofumesate applications were applied with 4.8 kg!h ofurea and 9.1 kg/h iron chelate. One application ofpaclobutrazol at 0.6 kg!h applied late April was also evaluated for controlof P. annua.All herbicideapplicationswereappliedwitha C02 backpacksprayer delivering 740 Liha. Ethofumesate applied twice at 1.7, 1.1, or 0.8 kg/h provided 59, 62-82 and 80 83% P. annua seedhead suppressionas comparedto untreatedplots on May zo".Priorto theonsetof high summertemperatures. threeapplicationsof ethofumesatcat 1.7. 1.1,or 0.8 kg/h reduced P. annua populations at Horticultura1 farm II from 38 to 22, 16 and 20%, respectively. However, injuryto bentgrass was 25, 15, and 5%, respectively. Paclobutrazol reduced P. annua populations to 26% with no bentgrass injury. At Little Mill threeapplications ofethofumesate at 1.7, 1.1, or 0.8 kglh reduced P. annua populationsfrom62 to 16,23 and32%,respectively.However,injuryto bentgrasswas 55,53, and 33%, respectively. Paclobutrazol reduced P. annua populations to 34% with no bentgrass injury. Throughout the summer P. annua populations declined in the untreatedplots due to summerheatstressbutappreciableincreasesin P. annuacontrol were not detected with additional applications of ethofumesate while bentgrass turf quality continued to be lower as compared with untreated or paclobutrazol treated bentgrass. In September, following all eight applications of ethofumesate, P. annua populationswereonly significantlylowerthenuntreatedplotsat LittleMill when ethofumesatewas appliedatthehighestapplicationrates. Theresultsof thesestudiessuggestthatspringapplicationsof ethofumesatemay potentiallyprovideseedheadsuppressionandsubstantialpopulationreductionsof P. annua.However.summerapplicationof ethofumesatecouldnot furtherreduceP. annua populationsandcontinuedto causeunacceptableinjuryto bentgrass.Thevigorreduction of bentgrassmay haveallowedP. annuato moreeasily reinfesttheethofumesatetreated plots in late summer. 1 Asst Prof.andProgramAssoc., New JerseyAgriculturalExperimentStation,CookCollege, Rutgers,The StateUniversityof New Jersey.New BrunswickNJ 08901 99
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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
Page 47 and 48: PREEMERGENCE HERBICIDES INFLUENCE W
Page 49 and 50: COMPARISON OF WEED CONTROL SYSTEMS
Page 51 and 52: Table I Mean Percent Weed Control V
Page 53 and 54: 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: CONTROL OF POAANNUA FROM MULTIPLE S
Page 101 and 102: LATERAL DEVELOPMENT OF PLANT oaowra
Page 103 and 104: RE-ROOTING OF FOUR VARIETIES OF CRE
Page 105 and 106: Table 2. Top growth weights (fresh)
Page 107 and 108: CONTROL OF DALLISGRASS IN COOL SEAS
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