Proceedings of the Sixty-first Annual Meeting of the Northeastern ...

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50 CONTROL OF NEW WEED SPECIES IN THE NURSERY INDUSTRY. J.F. Derr, Virginia Tech, Virginia Beach, and J.C. Neal, North Carolina State Univ., Raleigh. ABSTRACT Several new weed species have appeared in the nursery industry. Transport of nursery stock will eventually lead to widespread infestations in nurseries and landscapes. Development of control programs will allow producers to manage these weed species before they become established. Studies were established in VA and NC to determine the effectiveness of preemergence herbicides currently used in container production. Experiments were conducted in 1-gal containers utilizing either 100% pine bark or pine bark+sand (8:1, v/v). The herbicides tested were: OH2, Rout, Regal O-O, Free 63, Ronstar, Broadstar, Snapshot TG, Gallery, Surflan, Barricade, Pendulum, Preen, Pennant Magnum and dimethenamid at maximum use rates. In addition, Snapshot and Ronstar were applied at 2.5 and 2.0 lb ai/A respectively. In the VA trial at 4 weeks after treatment (WAT), OH2, Rout, and BroadStar controlled tasselflower (Emilia spp.), thickhead (Crassocephalum crepidioides (Benth.) S. Moores), chamberbitter (Phyllanthus urinaria L.), longstalk phyllanthus (Phyllanthus tenellus Roxb.), and mulberry weed (Fatoua villosa (Thunb.) Nakai). BroadStar, Pennant Magnum, and dimethenamid all gave excellent control of doveweed (Murdannia nudiflora (L.) Brenan), while all other treatments gave poor to no control. Weed control with Snapshot and Ronstar increased as the rate increased. Showcase at 5.0 lb ai/A gave very similar weed control as Snapshot at 5.0 lb ai/A. Surflan was the overall most effective dinitroaniline, with Preen the least effective. Generally similar weed control was seen with Pennant Magnum and dimethenamid. Gallery suppressed chamberbitter and longstalk phyllanthus but gave good to excellent control of the composite weeds. All treatments except Free 63 and Preen controlled mulberry weed. In the NC trial at 4 WAT, Snapshot, Surflan, Gallery, and dimethenamid were the only treatments that controlled galinsoga (Galinsoga ciliata (Raf.) Blake). Marsh parsley (Apium leptophyllum (Pers.) Sprague ex Britt. and P. Wilson) was controlled well only by Broadstar, the high rate of Snapshot, Showcase, Surflan and dimethenamid. American Burnweed (Erechtites hieraciifolia (L.) Raf. Ex DC.), was controlled by Rout, Broadstar, Snapshot, Showcase, Surflan, Regal OO, Gallery, and dimethenamid. Petty spurge (Euphorbia peplus L.) was controlled by OH2, Rout, Broadstar, Regal OO, Showcase, Surflan, 4 lb a.i./A Ronstar, Gallery and Barricade. Petty spurge was generally equally susceptible to herbicides as spotted spurge, except for Snapshot, Pennant Magnum, and dimethenamid, which controlled spotted but not petty spurge. Marsh yellowcress (Rorippa islandica (Oeder) Borbás) was well controlled by most treatments except Pendulum AquaCap, Barricade, Preen and Pennant Magnum. Groundsel tree (Baccharis halimifolia L.) was well-controlled by all treatments except Free 63, Ronstar, Pendulum AquaCap and Preen. Willowherb was controlled by OH2, Rout, Broadstar, Regal OO, Ronstar, Surflan, Pennant Magnum and dimethenamid. Some of the weeds, including doveweed and marsh parsley, were not well controlled by several combination herbicides. When new weeds are introduced into nurseries, herbicide selection will be a critical component of an integrated weed management program. 32
51 EVALUATION OF GRANULAR HERBICIDES IN CONTAINER-GROWN WOODY ORNAMENTALS. S. Barolli, Imperial Nurseries, Granby, CT and J. Ahrens, Connecticut Agricultural Exp. Station, Windsor. ABSTRACT Seven granular herbicide products were evaluated in 2006 for efficacy and tolerance by seven woody ornamentals. The ornamentals included hydrangea (Hydrangea macrophylla ‘Endless Summer’), dwarf burning bush (Euonymus alatus ‘Compacta’), rose (Rosa ‘Carefree Marvel), Snowstorm Spirea (Spiraea hybr. ‘Snowstorm’), Tinkerbelle lilac (Syringa hybr. ‘Bailbelle’), weigela (Weigela florida ‘My Monet’ and butterfly bush (Buddleia davidii ‘Black Knight’). All plants were transplanted into 1-gallon pots on 6/19/06 with media consisting of 70% pine bark, 15% peat and 15% sand by volume, and were actively growing at treatment on 6/21/06. Three pots of each plant and six plantless pots were included in each plot and the herbicide treatments and untreated control were arranged in randomized complete blocks with four replications. Large crabgrass (Digitaria sanguinalis L. Scop) and common groundsel (Senecio vulgaris L.) were seeded only in the plantless pots on 6/21/06, and were pulled and counted on 7/19 and 8/18. The herbicides included OHP-31906 at 100, 200 and 400 lb product/A, oxyfluorfen 2% + pendimethalin 1% (OH-2) at 100 lb/A, isoxaben 0.5% + trifluralin 2% (Snapshot 2.5TG) at 150 lb/A oxyfluorfen 2% + trifluralin 3.0% (Weedfree 75) at 100 and 200 lb/A, flumioxazin 0.25% (BroadStar) at 150 lb/A, trifluralin 2% + isoxaben 0.25% + oxyfluorfen 0.25% (Showcase) at 100 and 200 lb/A and oxadiazon 2% (Ronstar 2G) + napropamide 10% (Devrinol 10G) at 200 + 40 lb/A. The herbicides were applied with a calibrated auger-feed granular applicator on 6/21/06 over dry plant foliage and reapplied on 9/7/06. On 9/8/06 annual bluegrass (Poa annua L.) and common groundsel were seeded into the plantless pots. Overhead irrigation for 25 minutes was applied starting within 10 minutes of the last herbicide (oxadiazon). Reduction in weed counts and % control based on numbers varied with herbicide and dosage (Table 1). Weed population were so high in controls on 7/19 (4WAT-1) that pulling and counting removed soil, as well as weed seeds, resulting in low populations in the controls thereafter. Hydrangea was the only species injured, and the only species that trapped granules in whorls. All herbicide treatments injured the hydrangea (Table 1.) and this injury was reflected in plant vigor reductions. The lowest rate of Weedfree 75, Showcase and OH-2 caused the least injury. The Ronstar + Devrinol combination which has been the standard for hydrangea at this nursery, caused more injury than in practice, probably because in practice granules are brushed off the leaves before irrigation and this was not done in this experiment. Following the August ratings the ornamentals were pruned and retreated. None of the treatments injured the mature hydrangea foliage following the second application. 33
Page 1 and 2: 1 Proceedings of the Sixty-first An
Page 3 and 4: 3 NORTHEASTERN WEED SCIENCE SOCIETY
Page 5 and 6: 5 SECTION CHAIRS Agronomy Chair: J.
Page 7 and 8: 7 CARFENTRAZONE AND QUINCLORAC FOR
Page 9 and 10: 9 THE EFFICACY AND CROP TOLERANCE O
Page 11 and 12: 11 EVALUATION OF HERBICIDES FOR CON
Page 13 and 14: 13 BEING HEARD BY THE IR-4 PROJECT.
Page 15 and 16: 15 ABSTRACTS FROM THE 7 TH CONFEREN
Page 17: 17 HERBICIDE NAMES: COMMON, TRADE,
Page 20 and 21: 20 INTEGRATING WEED CONTROL STRATEG
Page 22 and 23: 22 GIANT HOGWEED ERADICATION IN PEN
Page 24 and 25: 24 EFFECTS OF EMERGENCE PERIODICITY
Page 26 and 27: 26 PRODUCER AND PRODUCTION IMPACTS
Page 28 and 29: 28 A SIMPLE METHOD FOR CLEANING TUF
Page 30 and 31: 30 EMERGENCE AND PERFORMANCE OF TWO
Page 32 and 33: 32 CARFENTRAZONE AND QUINCLORAC FOR
Page 34 and 35: 34 2006 NEWSS SUMMER WEED CONTEST R
Page 36 and 37: 36 INVASIVE AQUATIC WEEDS IN NORTH
Page 38 and 39: 38 AMMONIUM PELARGONATE AS A BIOHER
Page 40 and 41: 40 TRINEXAPAC-ETHYL INFLUENCES EFFI
Page 42 and 43: 42 Table 1. Insect feeding damage,
Page 44 and 45: 44 WEED CONTROL WITH TOPRAMEZONE PR
Page 46 and 47: 46 ROTARY HOE EFFICACY IN CORN: INF
Page 48 and 49: 48 ALFALFA/GRASS FORAGE MIXTURES US
Page 52 and 53: 52 Table 1. Results of 2006 contain
Page 54 and 55: 54 TOLERANCES OF ORNAMENTAL SHRUBS
Page 56 and 57: 56 2006 WEED MANAGEMENT TRIALS IN C
Page 58 and 59: 58 THE RESPONSE OF FIELD AND CONTAI
Page 60 and 61: 60 THE EFFICACY AND CROP TOLERANCE
Page 62 and 63: 62 Table 2. Plant quality ratings o
Page 64 and 65: 64 EVALUATION OF PROLINE-LINKED PEN
Page 66 and 67: 66 ANNUAL BLUEGRASS AND DOLLAR SPOT
Page 68 and 69: 68 Table 1. Autumn 2005 versus spri
Page 70 and 71: 70 A PRELIMINARY STUDY OF THE NON-N
Page 72 and 73: 72 native species, covering and smo
Page 74 and 75: 74 EFFECTS OF BUCKWHEAT RESIDUE ON
Page 76 and 77: 76 Japanese knotweed control 28 DAT
Page 78 and 79: 78 ENHANCED TOLERANCE TO WEED COMPE
Page 80 and 81: 80 EFFECTS OF PLANTING AND TERMINAT
Page 82 and 83: 82 A UNIFYING FRAMEWORK FOR SPECIES
Page 84 and 85: 84 BIOLOGY OF MULTIFLORA ROSE: AN I
Page 86 and 87: 86 AN OUNCE OF PREVENTION. M.J. Van
Page 88 and 89: 88 HERBICIDE COMPARISON IN WET BLAD
Page 90 and 91: 90 Table 1. Morrow's honeysuckle (L
Page 96 and 97: 96 HOT WATER SYSTEMS FOR VEGETATION
Page 98 and 99: 98 SEEDHEAD SUPPRESSION OF ANNUAL B
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100 ROUGHSTALK BLUEGRASS CONTROL WI
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102 EFFECT OF DEW AND GRANULAR FORM
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104 USE OF TRICLOPYR TO REDUCE ANTI
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106 YELLOW NUTSEDGE CONTROL WITH SU
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108 PRE AND POST EMERGENT ANNUAL BL
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110 PUMPKIN RESPONSE TO HALOSUFSULF
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112 Figure 1. Grass cover following
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114 CHEMICAL CONTROL OF APPLE ROOT
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116 STRAWBERRY PLANTING YEAR WEED C
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118 WEED CONTROL IN NO-TILL PUMPKIN
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120 NATURAL PRODUCT POTENTIAL FOR W
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122 THE IR-4 PROJECT: UPDATE ON HER
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124 PEDIGREE OF A PESTICIDE. D.R. S
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126 SEEDHEAD SUPPRESSION OF ANNUAL
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128 APPLICATIONS FOR SULFENTRAZONE
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130 HORSEWEED: FROM OBSCURITY TO TH
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132 RECENT FINDINGS ON THE FIELD BE
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134 HORSEWEED RESPONSE TO NO-TILL P
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136 THE MASSACHUSETTS EXAMPLE: ONE
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138 Supplemental NEWSS Abstracts (p
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140 ABSTRACTS AND BIOGRAPHIES FOR P
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142 EVALUATION OF AN HERBICIDE APPL
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144 ALUMINUM TREATMENT FOR PHOSPHOR
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146 BIOLOGICAL CONTROL OF AQUATIC W
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148 THE 2002 FARM BILL AND ITS EFFE
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150 LAND USE PRACTICE IMPACTS ON NO
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152 A NEW STANDARD FOR DEFINING AQU
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154 PORTRAIT OF THE HEALTH STATUS O
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156 TEN YEARS OF VARIABLE WATER MIL
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158 Northeastern Weed Science Socie
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160 meeting attendance numbers have
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162 members or to members of the Ex
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164 primary areas that had increase
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166 1 st place: Evaluation of Kentu
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168 d) Resolutions Committee Appoin
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170 2005, Hilary Sandler and Brent
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172 (Ornamentals), Rakesh Chandran
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174 Total Expenses $38,227.24 Total
Page 176 and 177:
176 PUBLIC RELATIONS Brent Lackey A
Page 178 and 179:
178 • 2 nd place team: Guelph tea
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180 WSSA REPRESENTATIVE Jeffrey Der
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182 b. Legislative Visits training
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184 b. Selection of a WSSA Member f
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186 WSSA Provides Comments to the C
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188 $179 million, in contrast to a
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190 NEWSS PAST PRESIDENTS Gilbert H
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192 1986 John R. Havis University o
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194 DISTINGUISHED MEMBERS 2002 Brad
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196 1991 1 Elizabeth Maynard Cornel
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198 COLLEGIATE WEED CONTEST WINNERS
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200 1996 - Penn State Agronomy Farm
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202 RESEARCH POSTER AWARDS 1983 1.
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204 1998 1. Weed Control Studies wi
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206 INNOVATOR OF THE YEAR 1986 Nath
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208 1960 The Influence of Cultivati
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210 1975 1. Control of Jimsonweed a
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212 1985 1. Peach Response to Sever
Page 214 and 215:
214 Chris Benedict Cornell Universi
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216 Robert A. DeWaine Monsanto 505
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218 Robert Hedberg USDA/CSREES Scie
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220 Brian G Lackey Weeds Inc. 250 B
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222 Thomas Molloy University of Mai
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224 John Roy RWC, Inc. PO Box 876 2
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226 John R. Teasdale USDA-ARS Build
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228 HERBICIDE NAMES: COMMON, TRADE,
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230 Common Name Trade Name Chemical
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238 COMMON PRE-PACKAGED HERBICIDES
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240 Trade Name Resolve SG Rhino Rou
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242 COMMON AND CHEMICAL NAMES OF HE
Page 244 and 245:
244 Heck, G.R., 114 Henry, G.M., 15
Page 246 and 247:
246 MAIN SUBJECT INDEX (Herbicides,
Page 248 and 249:
248 glyphosate, 29, 38, 39, 57, 70,
Page 250:
250 shepherd's purse, 56 s-metolach
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