Vol. 54â2000 - NorthEastern Weed Science Society

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COMPARISON OF SULFOSATE AND GLYPHOSA TE FOR WEED CONTROL IN WILD BLUEBERRIES D. E. Yarborough and T. M. Hess' ABSTRACT Use ratesofhexazinone, theprimaryweedcontrolmaterialavailableforwild blueberries (Vaccinium angustifolium), havebeenreducedbecauseof problemswithleaching.and subsequentdetectionin groundwater.Lowerrateshaveresultedin less effective weed controlandin a changein weed speciespresent.Postemergencecontrolof weeds growingaboveandamongtheblueberrycropcanopyis needed. A studywas conducted at Blueberry Hill Farm, Jonesboro, ME and Guptills Wild Blueberry Farm, Wesley, ME from June to September, 1999 to compare the effectiveness of sulfosate and glyphosate with or without ammonium sulfate (AMS) applied by a Sideswipe® hockey stick type wiper in 10% or 20% solutions to dogbane (Apocynum androsaemifolium), bracken fern (Pteridium aqui/inum) and mixed hardwoods (Acer, Alnus, Betula sp.) on 7-8-99. A directed spray of I% or 2% v/v sulfosate and glyphosate, with or without AMS, was applied to I meter square bunchberry plots (Comus canadensis) and individual plant clumps of bunch grass (Andropogon scoparius) with a CO, powered backpack sprayer on 7-1-99 and 6-30-99, respectively. Phytotoxicity was evaluated at 7,14,21, and 42 days aftertreatment(DAl) andtreatmentswere replicated4 times. Dogbane,brackenfern and bunch grass were controlled equally well with either material regardless of AMS addition. Complete control of bunch grass was obtained at 7 DAT and dogbane at 21 DAT. Addition of AMS hadno effect on the control of bunch grass, bracken fern, dogbane or bunchberry but improved consistency of control for hardwoods. Bunchberry was suppressed by glyphosate or sulfosate up to 21 DAT, hut then regrowth began to occur. Thisexperimentindicatesthatsulfosateorglyphosateareequallyeffective in controlling bunch grass, bracken fern, doghane and hardwoods but not hunchberry. The addition of AMS was only beneficial with the woody species treated. • 'Blueberry Specialist and Research Associate, University of Maine, Orono, ME 04469 5722 6
Comparisonof Sulfosateand Glyphosatewith AMS for HardwoodControl 120 phytotoxicity 80 60 40 20 f--------------------j 01------ ____ 7 OAT 14 OAT 21 OAT 42 OAT r-----~=._---___, Comparisonof Sulfosateand Glyphosate withoutAMS for HardwoodControl 120 phytotoxicity 100 -- -- -- --:====="/~-I 60 ~--~---------- 40 20 O.... ---- ~ 7 OAT 14 OAT 21 DAT 42 OAT .-------~=,.,,--------, Treatment ~10%GLY .. 10%SlA. +20%GLY +20%SlA. -lITe Material=-significant at 7 OAT and highly significant at 14 and 21 OAT, Rate=highly significant at 7 OAT,and 21 OAT 7
Page 1 and 2: WEED REMOVAL TIMING WITH ROUNDUP RE
Page 3 and 4: EFFECT OF HERBICIDE RATES AND IRRIG
Page 5: 40 Effect of Pronone Applied with A
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 and 44: INFLUENCE OF TIMING ON WEED MANAGEM
Page 45 and 46: 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
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CONTROLLING ASTERACEAE WEEDS WITH R
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0... Figure1. GerminationRateof Roo
Page 67 and 68:
BIOLOGICALLY BASED WEED CONTROL STR
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NON·NATIVE VASCULAR FLORA OF BISCA
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principally in ruderal sites. lawns
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EVALUATION OF AZAFENlDIN FOR PREEME
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AUTOMATING MONITORING OF ROADSIDE W
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Table I: Swnmary of brush managemen
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Table I: Sequence codes and general
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IR-4 ORNAMENTAL RESEARCH PROGRESS F
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personnel with many of the illegal
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TOLERANCE OF ORNAMENTAL GROUNDCOVER
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MUGWORT CONTROL WITH CLOPYRALID AND
Page 89 and 90:
POTENTIAL WEEDINESS OF SEVERAL NEW
Page 91 and 92:
Table I: Identification, morphologi
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Trifolium tricolor 232 26 62 0 18 S
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NUTRIENT REMOVAL BY WEEDS IN CONTAI
Page 97 and 98:
CONTROL OF POAANNUA FROM MULTIPLE S
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ANNUAL BLUEGRASS (PDaannual CONTROL
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LATERAL DEVELOPMENT OF PLANT oaowra
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RE-ROOTING OF FOUR VARIETIES OF CRE
Page 105 and 106:
Table 2. Top growth weights (fresh)
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CONTROL OF DALLISGRASS IN COOL SEAS
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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
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ADVANCED FORMULATION TECHNOLOGY FOR
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Table I. Preemergence smooth crabgr
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0.57EW at O.l21bs ai/A plus Confron
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EFFICACY OF DITHIOPYR FORMULATIONS
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EFFECTS OF DROUGHT ON THE INTERFERE
Page 125 and 126:
WEED MANAGEMENT WITH HALOSULFURON I
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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
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HERBICIDE TOLERANCE IN CRANBERRIES
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Classification based on action on a
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EFFECTS OF SEVERAL POTENTIALLY USEF
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Supplement of the 53 rd Annual Meet
Page 141 and 142:
with society activities to anyone.
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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