Vol. 54â2000 - NorthEastern Weed Science Society

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Significance NS NS • NS NS .uMeans within columns, followed by the same letter, do not differ at the 5% level of significance (DMRT) 16
The Effect of Total Postemergence Herbicide Timings on Corn Yield D. B. Vitolo, C. Pearson, M. G. Schnappinger, and R. Schmenk ABSTRACT Replicated field trials were conducted in Livingston, New York, in 1996, 1997, and 1998 to evaluate the effect of pre- and postemergence herbicide programs on weed control and corn grain yield. Bicep II Magnum brand herbicide applied preemergence was compared to three timings of a total postemergence herbicide program using either Exceed + Accent + Banvel brand herbicides (1996) or Roundup Ultra brand herbicide (1997-1998), and ro Bicep II Magnum brand herbicide followed by a postemergence program. Posremergence timings corresponded to average weed heights of 2 to 4, 6 to 8, and 10 to 12 inches. In all years, the preemergence treatments resulted in > 90% control of all weeds, and the postemergence applications killed all emerged weeds. The weed spectrum in the test area included giant foxtail (Setaria faber; Herrm.), common ragweed (Ambrosia artemisiifolia L.), common lambsquarters (Chenopodium album L.), velvetleaf (Abutilon theophrasti Medik.), and wild radish (Raphinus raphanistrum L.). In both 1996 and 1997, yield loss was correlated with delaying postemergence applications, with the drier year (1997) resulting in higher percentage losses than 1996. Only the 2- to 4- inch postemergence timing resulted in yields similar to the preemergence treatment. In 1998, a wet spring was followed by dry summer. The 2-to 4-inch application timing was too early, and new weeds germinated to compete with the crop. The 10-to 12- inch application timing was too late, with the larger weeds reducing yield. Only the 6- to 8- inch postemergence timing resulted in yields similar to the preemergence treatment. In all 3 years, the application window for total postemergence treatments was narrow, ranging from 10 to 21 days. Given the challenge that herbicide applicators have in covering their acres, and the unpredictability of each season (weather, wet fields, and proper timing), a preemergence herbicide application followed by a postemergence herbicide, when needed, provides corn growers with an excellent strategy for flexible and effective weed control. 11 R&D Station Manager, Regional Research Manager, Senior R&D Scientist, R&D Scientist, Novartis Crop Protection, Hudson, NY 12534 17
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: Table I. Effect of napropamide and
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
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
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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
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Table I. Preemergence smooth crabgr
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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
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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