Vol. 54â2000 - NorthEastern Weed Science Society

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present at the initiation of the study, these plots had the residue from an another season of growth, compared to the sequences initially sprayed in the spring. This residue was abundant enough to appear to inhibit establishment of the seed mix, rather than serving as a protective mulch. The Japanese knotweed at the Etna site was not satisfactorily controlled, particularly in the undisturbed areas, and the grass mixture never hadan opportunity to establish. Knotweed in the undisturbed stands was reduced in height by about 20 percent compared to the height at treatment on 5/14/98, but had greater than 90 percent cover. In the on-ramp area, which was somewhat open to begin with, cover from the grass mixture was 90 to 95 percent for the SIP/F, P=SIF, and PIFISsequences on June 24, 1999, 14 months after study initiation. Knotweed cover averaged 25 percent for these three sequences, and retreatment was definitely needed. A contributing factor to the reduced success at the Etna site may be that the knotweed was much larger thanthe knotweed at the Doylestown site when the spring herbicide treatments were applied. making uniform coverage with a low volume application difficult. Another factor may be that Japanese knotweed is more tolerant to dicamba and clopyralid than Sakhalin knotweed. When the results of this study are considered collectively with previous disappointing results with dicamba plus clopyralid on Japanese knotweed in field day-type demonstrations in northeastern and southeastern PAt it becomes apparent that the approach of regarding the two knotweed species as basically identical in terms of management may be seriously flawed. SUMMARY When evaluated in August. 1999. rehabilitation sequences initiated in April. 1998 in a stand of Sakhalin knotweed had resulted in better establishment of the seeded fine fescue mixture than the sequence initiated at the end of August, 1998. TIIis difference is probably temporary, as knotweed reduction was excellent in all four sequences, and the grassin the later-initiated sequence should come to be as well established as the spring-initiated sequences during the 2000 growing season. When an effective herbicide combination is utilized, vegetation managers have considerable flexibility in their approach to rehabilitating knotweed infested sites. As long as managers acknowledge the tenacity and persistence of invasive species such as knotweed, use an adapted seed mix, and seed at the right time, they can successfully rehabilitate sites using a variety of sequences. ACKNOWLEDGMENTS This research was funded hy the Pennsylvania Department of Transportation, Maintenance and Operations. Bureau of LITERATURE CITED McKee,G.W., J.V. Raelson, W.R. Berti, and R.A. Peiffer. 1982. Tolerance of Eighty Plant Species to Low pH, Aluminum, and Low Fertility. Agronomy Series No. 69, The Pennsylvania State University. 80
IR-4 ORNAMENTAL RESEARCH PROGRESS FOR 1999' J. Ray Frankl ABSTRACT The IR-4 Ornamental Research Program was initiated in 1963 to develop data for use in the national label pesticide registration for specialty or minor use food crops. In 1977, the IR-4 Program began developing research data for use in the national registration of pesticides for the green industry. In 1999, over 600 ornamental research trials were conducted including 202 on herbicides and 48 on plant growth regulators. These trials were conducted in 13 states by 14 researchers on the following herbicides: Bentazon Clethodim Clopyralid Diclobenil Dithiopyr Fluazifop-P-butyl Imazethapyr Metolachlor Napropamide Oryzalin Oxadiazon Oxyfluorfen + Oryzalin Oxyfluorfen + Pendimethalin Pendimethalin Prodiamine Thiazopyr Trifluralin Plant growth regulators include: Chlormequat chloride Ethephon Paclobutrazol Uniconazole P During 1999, 274 new registrations were obtained as the result of the IR-4 Program. Since the Ornamental Program was initiated, over 6,800 registrations have been obtained with over 1,600 of them for herbicides and 75 for plant growth regulators. These registrations include those for nursery, floral crop, forestry and turf production. Registrations have also been developed for use in the commercial landscape, interior plantscapes and tissue culture. New Jersey Agriculture Experiment Station, Publication No. A27200-05-99 supported by State, U.S. Hatch Act and other U.S. Department of Agricultural funds. 2 Ornamentals Manager, IR-4 Project Rutgers, The State University of New Jersey North Brunswick, NJ 08902-3390 81
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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
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: Table I: Sequence codes and general
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 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
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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
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with society activities to anyone.
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WINTER SQUASH CULTIVARS DIFFER IN R
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INCORPORATING QUINCLORAC IN AUTUMN
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Control efforts aim to eradicate bo
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Table I Weed canopy, insect and dis
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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