Vol. 54â2000 - NorthEastern Weed Science Society

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RESPONSE OF TIIREE CRANBERRY CULTIVARS TO TIIREE SULFONYLUREA HERBICIDES T. A. Bewick and lC. Porter' ABSTRACT The cranberry cultivars Early Black, Howes and Stevens were tested for tolerance to rirnsulfuron, nicosulfuron and prosulfuron. All herbicides were applied at 0, 35 and 70 g aiIba in 246 Liha of carrier.Applicationsweremadeafterfruithadset. Eachcultivarwas growingin separateareas. Therewere fourreplicationsof eachherbicideandratearranged. in a CompletelyRandom Design. Plotswere1 m 2 . Visualobservationsweremadethroughoutthe growingseason for symptoms of crop injury. At harvest, all fruit were collected with hand-held scoops. Fruit were sorted,countedandfreshweight determined.Analysisof variancewas usedto determine treatmenteffects andinteractions.Basedon fruitfreshweight,rimsulfuronandnicosulfurondid not injureany of the cultivars. Prosulfuronreducedfruitweightin all cultivars. In 'EarlyBlack' and 'Howes', only the high rate ofprosulfuron caused weight reduction. In 'Stevens' both 35 and70 gIhacausedreductionin fruitweightwhencomparedto the untreatedcontrols. 'Extension ProfessorandResearchAssistant,UMass CranberryExperimentStation,East Wareham, MA 02538. 136
EFFECTS OF SEVERAL POTENTIALLY USEFUL HERBICIDES IN CRANBERRIES B. A. Maiek and A. O. Ayeni' ABSTRACT Extensivegreenhousescreeningidentifiedseveralnew herbicideswithpotentially low phytotoxicity when applied to established cranberries. These herbicides were evaluated in cranberry bogs at Rutgers Blueberry/Cranberry Research and Extension Center in 1998 and 1999. Dormant herbicide treatments were applied on April 28, 1998, andon May 5,1999. Postemergencetreatments were appliedon June 16, in 1998, andon June 10, 1999 when the cranberrieswere in bloom and growing rapidly. Treatments applied to dormant cranberries included pronamide at 3.0 1b aila, isoxaflutole at 0.14 lb aila, clomazone at 0.5 Ib aila, asulam at 4.0 lb aila, quinclorac at 0.5 Ib aila, rirnsulfuron at 0.03 1b aila, and thiflusulfuron at 0.06 lb aila. June treatments, to actively growing cranberries in bloom, included asulam at up to 4.0 Ib aila, chlorimuron at 0.02 1b ai/a, nicosulfuron at 0.06 lb aila, quinclorac at 0.5 lb aila, rimsulfuron at 0.03 lb aila, rribenuron-methyl at 0.004 to 0.02 lb aila, and thiflusulfuron at 0.06 lb aila. Isoxaflutole caused very slight marginalwhiteningof new foliage for a few weeks after application. Although less thanten percent of the new foliage was affected by isoxaflutole, and recovery was rapid, the herbicide was dropped after 1998 due to groundwater contaminationconcerns. Asulam causedthe cranberriesto exhibit a slight to moderate subtle change in the color of the foliage thatappearedin the new growth and lasted for one to threemonthsafterapplication. The foliage treatedwith asulamappearedtannerin color than untreatedcranberries. The color difference was clearly noticeable next to untreatedcranberries,but would be more difficult to recognize if the entire bog were treated. No other symptoms were observed, and the cranberries recovered by late summer. Chlorimuroncaused cranberryfoliage to exhibit slight temporarychlorosis, which appeared about a week after the June application. Recovery was rapid and complete. All the herbicidesscreenedon cranberrieswere also evaluatedfor the control of three serious weeds in cranberries, roundleaf greenbriar (Smilax rotundifolia L.), prickly dewberry (Rubus flagellaris L.), and yellow loosestrife ILvsimachia terrestris (L.) BSP.). Two herbicides, quincloracand asulam, were effective for the control yellow loosestrife, when applied in July. None of theherbicideseffectively controlledprickly dewberry or roundleaf greenbriar. I Prof. and Visiting Prof., Plant Sci. Dept., Rutgers A.R.E.C., Bridgeton, NJ 08302 137
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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
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MODE OF ACTION, ABSORPTION, TRANSLO
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INFLUENCE OF CROWNVETCH WITH AND WI
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lRUMPETCREEPER, HONEYVINEMILKWEED,A
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FLUFENACET PLUS METRIBUZIN PLUS ATR
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CONTROLLING ASTERACEAE WEEDS WITH R
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0... Figure1. GerminationRateof Roo
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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
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: Classification based on action on a
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