Vol. 54â2000 - NorthEastern Weed Science Society

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EFFECT OF RATE, FORMULATION AND APPLICATION METHOD ON EFFICACY AND PHYTOTOXICITY OF GRANULAR HEXAZINONE IN WILD BLUEBERRY FIELDS D. E. Yarborough and T. M. Hess' ABSTRACT Granular hexazinone has been used in wild blueberry fields since 1993, either as a liquid impregnatedon fertilizeroras a 10%granule. Concernsaboutlackof efficacyand blueberryinjurywhenappliedwitha Vicoo-typespreaderprompteda requestto evaluate a 5%granuleto providefor betterdistributionandcrop safety. Granularhexazinonewas appliedas PrononeMG® on 6/16/99 witheitheranairassistspreaderorVicon® spreaderat 1 or2 Ibai/ain a 50/0or 10%formulationto 1.5acreblockson a commercial blueberry field on Township 18 MD, Maine. Ten, I meter square transect per treatment block were evaluated for two untreated blocks and for each application equipment, formulation and rate (2x2x2~ 8 treatment blocks) on 8/6/99 for weed cover and phytotoxicity to blueberry plants. The effect of equipment was highly significant with the air-assist application having a greater weed cover and less phytotoxicity and the Vicon spreader with less weed cover and a higher phytoxicity rating. With both the airassistspreaderandtheViconspreader,weedcoverwas reducedforthetreatedvs the untreated and was lower for the 2 lb vs the I Ib rate but formulation percentage had no effect on weed.cover. Phytotoxicitywas significantlyhigheron the 10%vs the 5% formulation, whenappliedwiththeVicon spreader,butrateor formulationhadno significanteffect on phytotoxicitywhenappliedwithan airassist spreader. So the 5% granule would provide better crop safety when used at the higher rate in the Vicon spreaderbuthadno significanteffect on weedcover. No effect on weedcover or phytotoxicityforthe5%vs 100/0formulationwas seen whenappliedwiththeair-assist spreader. , Blueberry Specialist and Research Associate, University of Maine, Orono, ME 04469 5722 4
40 Effect of Pronone Applied with Air Assist Spreader on Weed Cover and Blueberry Injury Percentcover/plot Weed Cover: Control vs Treatment and 5%vs 10% Highly Significant 30 Phytotoxicity: Not Significant 20 10 Control 5%1letA 5%218A 10%1 letA 10%2 letA 20 , 15 ' 10 Effect of Pronone Applied with Vlcon Spreader on Weed Cover and Blueberry Injury Percentcover/plot Weed Cover: Control vs Treatment and 1lb vs 21b Highly Significant Phytotoxicity: Control vs Treatment and 6%vs 10% , -- -- - - - -- -- - -- -- . - - H1ghly-S1gnlflcant--- . -- ---- 5 o Control 5% 1 LBfA 5% 2 LetA 10% 1 LetA 10%2 LetA 5
Page 1 and 2: WEED REMOVAL TIMING WITH ROUNDUP RE
Page 3: EFFECT OF HERBICIDE RATES AND IRRIG
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 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
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
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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
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CONTROL OF POAANNUA FROM MULTIPLE S
Page 99 and 100:
ANNUAL BLUEGRASS (PDaannual CONTROL
Page 101 and 102:
LATERAL DEVELOPMENT OF PLANT oaowra
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RE-ROOTING OF FOUR VARIETIES OF CRE
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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
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Table 2. Fresh weight (grams) barve
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MANAGING FENOXAPROP RESIST ANT CRAB
Page 115 and 116:
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
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.
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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