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

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32 CARFENTRAZONE AND QUINCLORAC FOR WEED CONTROL DURING TURFGRASS ESTABLISHMENT. B.W. Compton, J.B. Willis, and S.D. Askew, Virginia Tech, Blacksburg. ABSTRACT Seeded bermudagrass varieties are currently used by fine turf managers on fairways, athletic fields, and home lawns. Yukon bermudagrass is one example of a seeded bermudagrass chosen primarily for its cold hardiness. As in any turfgrass establishment situation weeds are among the greatest limiting factors. Therefore, research is needed on weed control options during establishment of seeded bermudagrasses. A study was conducted on Yukon bermudagrass at Virginia Tech’s Glade Road Research Facility in Blacksburg, VA to evaluate weed control and bermudagrass seedling response to several herbicides applied before the first mowing. Treatments included bromoxynil (0.5 lb ai/A), bentazon (1 lb ai/A), carfentrazone (0.0156 lb ai/A), quinclorac (0.375 lb ai/A), MSMA (1.5 lb ai/A) followed by MSMA (1.5 lb ai/A), primisulfuron (0.0234 lb ai/A), triasulfuron (5 g ai/A), prosulfuron (10 g ai/A), metsulfuron (8.5 g ai/A), foramsulfuron (11.9 g ai/A), sulfosulfuron (13.6 g ai/A), halosulfuron (21.3 g ai/A), V-10142 (0.75 lb ai/A), sulfentrazone (0.25 lb ai/A), Q4 (1.35 lb ai/A), carfentrazone (0.0156 lb ai/A) + quinclorac (0.375 lb ai/A), carfentrazone (0.0156 lb ai/A) + MSMA (1.5 lb ai/A) followed by carfentrazone (0.0156 lb ai/A) + MSMA (1.5 lb ai/A), sulfentrazone (0.545 lb ai/A), and a nontreated check. Ratings included bermudagrass cover, and visually estimated control of giant foxtail (Setaria faberi), yellow foxtail (Setaria glauca), Pennsylvania smartweed (Polygonum pensylvanicum), eastern black nightshade (Solanum ptycanthum), carpetweed (Mollugo verticillata), common lambsquarters (Chenopodium album), broadleaf dock (Rumex crispus), hairy galinsoga (Galinsoga ciliate), and large crabgrass (Digitaria sanguinalis) seedlings. Final ratings included an overall assessment of broadleaf and grassy weeds and bermudagrass cover. Treatments with carfentrazone + quinclorac and carfentrazone + MSMA controlled a broad spectrum of weeds and resulted in over 80% bermudagrass coverage, and less than 5% broadleaf weeds and 15% grassy weeds, 10 WAIT. MSMA, Q4, and foramsulfuron single applications had 62, 77, and 65% bermudagrass cover, respectively, 10 WAIT. All other treatments resulted in less than 50% bermudagrass cover at the final rating, predominately due to weed infestation. 14
33 FENARIMOL TOLERANCE OF AN ANNUAL BLUEGRASS BIOTYPE. G.M. Henry, A.C. Hixson, and F.H. Yelverton, North Carolina State Univ., Raleigh. ABSTRACT Annual bluegrass (Poa annua L.) is one of the most problematic weed species in high maintenance turfgrass. Its lime green color contrasts that of desired turfgrass species, giving the turf a blotchy, mottled appearance and disrupting the overall color uniformity. Fenarimol (Rubigan TM A.S. Turf and Ornamental) is a highly effective locally systemic fungicide that is labeled for the control of a number of economically important turfgrass diseases. However, fenarimol is also labeled for the control of Poa annua in overseeded bermudagrass greens and tees, tall fescue, and Kentucky bluegrass. Annual bluegrass is adaptable to many environments. Its genetic diversity varies widely, differing in populations occurring over as little as a 3 m 2 area. Broad genetic diversity plus the selection pressure of a single herbicide family over time contribute to the potential for herbicide tolerance. A suspected tolerant Poa annua population had been treated with fenarimol during the onset of winter dormancy in bermudagrass for the past six consecutive years at the Desert Mountain Golf Club in Scottsdale, AR. After investigating application practices, application dates, and cultural methods, the suspected fenarimol tolerant Poa annua biotype was collected in the spring of 2004. Plants were obtained from the tees of several different holes and transplanted into the greenhouse and grown to maturity. Mature seeds were removed from the plants as they ripened and placed in storage. Dose-response experiments were conducted to determine the level of tolerance of the collected biotype and a susceptible biotype to fenarimol. Ten seedlings with a root length of at least 4 mm were placed on a Petri dish containing 25 ml of herbicide agar solution and incubated for 7 days in the growth chamber at 15/25 C on a 10-hr photoperiod. Fenarimol assay concentrations consisted of a non-treated check and 0.125, 0.25, 0.5, 1, 2, 4, 8, 16, and 32 mmol treatments. Each treatment was replicated four times and randomized in the growth chamber to account for confounding factors. Shoot and root length measurements (mm) were taken at 0, 3, and 7 days after seedling transfer to agar plates. Data were subjected to analysis of variance and tested for goodness of fit to linear and quadratic functions. Dose-response curves suggest that the tolerant Poa annua biotype was less sensitive to fenarimol than the susceptible biotype. A 4-6-fold increase in tolerance to fenarimol was observed when comparing Poa annua root growth to the susceptible biotype at the three highest fenarimol assay concentrations 3 and 7 days after seedling transfer to the agar plates. The presence of fenarimol tolerant Poa annua, in addition to previously documented biotypes tolerant to several herbicide classes, may indicate a need for the integration of resistance management into golf course management practices. 15
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 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 50 and 51: 50 CONTROL OF NEW WEED SPECIES IN T
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
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82 A UNIFYING FRAMEWORK FOR SPECIES
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84 BIOLOGY OF MULTIFLORA ROSE: AN I
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86 AN OUNCE OF PREVENTION. M.J. Van
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88 HERBICIDE COMPARISON IN WET BLAD
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90 Table 1. Morrow's honeysuckle (L
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92 EVALUATION OF HERBICIDES FOR CON
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94 EVALUATION OF HERBICIDES FOR CON
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96 HOT WATER SYSTEMS FOR VEGETATION
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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
Page 138 and 139:
138 Supplemental NEWSS Abstracts (p
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140 ABSTRACTS AND BIOGRAPHIES FOR P
Page 142 and 143:
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
Page 154 and 155:
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
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176 PUBLIC RELATIONS Brent Lackey A
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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
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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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Page 238 and 239:
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
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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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