Vol. 54â2000 - NorthEastern Weed Science Society

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EFFECTIVENESS OF DIFLUFENZOPYR PLUS DICAMBA FOR WEED CONTROL IN SWEET CORN R. J. Durgy and F. J. Himmelstein' ABSTRACT Two field trialswere conductedin 1999to evaluatepostemergenceapplicationsof BAS662 (diflufenzopyr + dicamba) in combination with several labeled pre and postemergenee herbicidesas a weed controloptionin sweet com (Zeu mays saccharata L. var.Lancelot). The first trial evaluated sweet com toleranee to several rates (0.148, 0.196, 0.294, 0.391 kg aiIba) of BAS662 applied early postemergenee (EP). All treatments were preceded by preemergence applications of dimethenamid + atrazine at 2.8 kg aiIba. The four BAS662 treatments were appliedwith a non-ionicsurfactantat 0.25% v/v aloneandin combinationwith a 28%nitrogen solution. A band weeded check was included. Tolerance to BAS662 was evaluated by analysis of plot weights, average length of a random sample often ears, and tip fill of the same ten ears. Tip fill was not affected by anyherbicidetreatment.Therewere significantdifferences among treatments in plot weight (P
WEED CONTROL IN SWEET CORN WITH CARFENTRAZONE M.J. VanGessel, Q. Johnson, and M. Mahoney' ABSTRACT Sweet com (Zea mays) growers could benefit from the availability of a POST herbicide that improves overall weed control, but not limit crop rotation. The development of PPO-inhibitors in field corn (Zea mays) may provide some new options for sweet com as well. There is interest in labeling carfentrazone for use in sweet com. Studies were conducted to evaluate the potential for carfentrazone use in sweet corn. Carfentrazone was compared with other PPO-inhibitors, CGA-24B757 and flumiclorac. Field studies were conducted in 199B and 1999 at the University of Delaware's Research and Education Center. In 199B, carfentrazone, CGA-24B757, and flumiclorac were applied alone and in combination with 2,4-0. In 1999, carfentrazone, CGA 24B757, and flumiclorac were also applied in combination with atrazine. 'Bonus' was the sweet com variety in 199B. To evaluate crop tolerance, in 1999 four sweet com varieties were used. 'Bonus' and 'Steriing' are both processing varieties and 'Cotton Candy' and 'Alpine' are both fresh market varieties. Each variety was planted in separate rows of four row plots. Treatments were applied at V-5 com stage in 199B and V-3 stage in 1999. Injury was more noticeable when carfentrazone, CGA-24B757, and flumiclorac were tank-mixed with 2,4-0 or carfentrazone was applied with atrazine, compared to these herbicides applied alone. <strong>Weed</strong> control was improved when either of the PPOinhibitors was tank-mixed with 2,4-0 or atrazine compared to these herbicides alone. Cotton Candy was more tolerant to the PPP-inhibitors than the other varieties. While carfentrazone or other PPO-inhibitors tested are not broad spectrum enough, they may have merits to supplement soil-applied herbicides. These herbicides will need to be used as a planned approach since their effectiveness on weeds 7.5 to 10 em tall is greatly reduced, with a few exoeptions. Furthermore, the eariy application timing will improve weed control of those species with marginal tolerance to these herbicides. 'Assoc. Prof., Ext Assoc., University of Delaware, Georgetown, DE; and Tech. Serv., FMC, Oxford, MD. 127
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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
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: WEED MANAGEMENT WITH HALOSULFURON I
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