Vol. 54â2000 - NorthEastern Weed Science Society

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EARLY POSTEMERGENCE TIMING OF PREMIXES AND GLYPHOSATE: A NICE MATCH FOR ROUNDUP READY CORN M.J. VanGessel, Q. Johnson, A. Cooper, and C. Whaley' ABSTRACT Growers need effective weed control programs that limit the number of trips across the field. Recent revisions to herbicide labels allow premixed soil-applied herbicides to be applied to emerged com (Zea mays). This offers the potential to achieve early postemergence control followed by residual control. Labeled rates of the various premixed herbicides were applied to com at the spike to V 1 stage. These herbicide premixes included airazine in combination w~h s-metolachlor, alachlor, acetachlor, SAN-582, and FOE-5043 plus metribuzin, as well as Basis Gold. Atrazine was also tank-mixed w~h pendimethalin and Basis. Fall panicum (Panicum dichotomiflorum) control at layby was not acceptable for most treatments. Treatments w~h Basis plus atrazine or Basis Gold did provide 90% control of fall panicum. Poor control w~h other treatments was due to both poor initial control and lack of effective residual control for the weed species present. A second experiment examined most of the same premixed herbicides tankmixed w~h glyphosate, at 1 Ib aiJA, and applied to 2 to 5-collar Roundup Ready com. Excellent early-season weed control was achieved w~ all treatments due to addition of glyphosate. No reduction in glyphosate control was observed with any of the tankmixtures. Full-season control depended on species present at the various sites, In particular, momingglory (Ipomoea sp.) control was reduced ~h treatments containing less than 1.0 Ib aiJAof airazine. Delaying application of residual herbicides results in effective weed control until the crop is at a more advanced stage compared to applications made at planting. The use of Roundup Ready com and addition of glyphosate as a tank-mixture improves postemergence control. Finally, control of the initial flush of weeds is not dependent on rainfall or irrigation to move the soil-applied herbicide into the soil. 'Assoc. Prof., Ext.Assoc., Res. Assoc., and Grad. Res. Assoc., Univ. Delaware, Georgetown. 44
IMPACT OF GLYPHOSATE TIMING AND CORN ROW SPACING FOR COMMON LAMBSQUARTERS~CONTROL IN ROUNDUP READY CORN. K. Handwerk, M. A. Bravo, and W. S. Curran' ABSTRACT Two separate studies were conducted in 1998 andrepeated in 1999 that investigated the effect of glyphosateapplicationrateandtimingandrow spacingon the controlof conunon lambsquarters(Chenopodium album L.) in RoundupReadycom. Two sites werechosen in ._ Centre County, PA and the two studies repeated at these sites. All plots were planted on the same day and treated preemergence with a broadcast application offluthiantide (FOE-S043) at 0.6 lb aiJA for annual grasscontrol. In the rate and tinting experiment, glyphosate was applied at 0.5, 0.75, and 1.0 lb ai /A at four application times ranging from 3 to 7 weeks afler planting (WAP) (POST 1-4). In the row spacing experiment, glyphosate was applied at 0.5 and 1.0 lb/A to com planted in IS and30 inch spaced rows at two application times ranging from 3 to 6 WAP (EPOST & LPOST). Common lambsquarters percent control, density and biomass were measured.A total of fourexperimentswere conductedeach yearfortwo seasons. Eachtreatment was replicatedfourtimes in each experiment. In the rateandtimingexperimentapplicationtimingwas significantforcommon lambsquarterscontrolatbothlocationsandforbothyears. In two of these locations,controlof commonlambsquarterswas greateras applicationwas delayed,especially in 1998. At one location,common lambsquarterscontrolwas reducedin thePOST4 applicationbecauseof largerweeds andinterferenceof the spraypatternbylargercom. Applicationratewas significantin only one of the fourlocations,wherecommonlambsquarterscontrolincreasedwith increasingrate. In generalglyphosateprovidedgood to excellentcommon lambsquarterscontrol regardless of rate and tinting. In the row spacing study, glyphosate generally provided good to excellentcommonlambsquarterscontrolregardlessof rate,timingor row spacing. In one location,controlwas reducedin the O.5Ib/ALPOSTnarrowrow com treatment. This was probablydue to poorspraycoveragecausedby interferenceof com plantedin 15 inch rows. Thesetwo studiesshow thatglyphosateprovidesgood controlof commonlambsquarters in RoundupReadycom. Applicationtimingcan influencecontrol,while com row spacingwas not an importantconsiderationin these experiments. 1 Res. Technol.,Grad.Res. Asst. andAssoc. Prof.,Dept.of Agron.,PennStateUniv., University Park,PA 16802. 45
Page 1 and 2: WEED REMOVAL TIMING WITH ROUNDUP RE
Page 3 and 4: EFFECT OF HERBICIDE RATES AND IRRIG
Page 5 and 6: 40 Effect of Pronone Applied with A
Page 7 and 8: Comparisonof Sulfosateand Glyphosat
Page 9 and 10: N 1175 feet Roundup Ready Studies R
Page 11 and 12: VIRGINIA TECH'S ONLINE WEED IDENTIF
Page 13 and 14: WEED CONTROL AND YIELD OF CUT FLOWE
Page 15 and 16: Table I. Effect of napropamide and
Page 17 and 18: The Effect of Total Postemergence H
Page 19 and 20: with commercial fertilizer. In gene
Page 21 and 22: HERBICIDE APPLICATIONS VERSUS HANDW
Page 23 and 24: exceeded 4. The success of training
Page 25 and 26: _u ____ Table2: Estimatesof herbace
Page 27 and 28: DOUBLE CROP CORN WEED CONTROL IN VI
Page 29 and 30: ANNUAL WEED AND GRASS CONTROL IN CO
Page 31 and 32: MANAGING QUACKGRASSINFESTATIONSAS C
Page 33 and 34: USING HERBICIDE RESISTANT HYBRIDS T
Page 35 and 36: NICOSULFURONIRIMSULFURON COMBINATIO
Page 37 and 38: GLYPHOSATE ALONE AND PRECEDED BY PR
Page 39 and 40: ROUNDUPVS. LIBERTY:WHATHAVE WE LEAR
Page 41 and 42: In summary, application timing for
Page 43: INFLUENCE OF TIMING ON WEED MANAGEM
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 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 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