Vol. 51â1997 - NorthEastern Weed Science Society

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14 RBICIDE ACTIVITY ON FIELD HORSETAIL AND OTHER WEEDS Todd L. Mervosh' ABSTRACT An eriment was conducted at the Valley Laboratory in Windsor, CT to evaluate several her icides for control offield horsetail (EquisetumarvenseL.) and other weeds in a field that, after b .ng idle for several years, was disked in August 1994 and April 1995. By August 1995, the fi ld contained a dense and uniform population offield horsetail along with the following s: annual grasses [large crabgrass {Digitaria sanguinalis (L.) Scop.} and fall panicum (R nicum dichotomiflorum Michx.)], an annual sedge (Cyperussp.), common purslane (Portulaca leracea L.), redroot pigweed (Amaranthus retroflexus L.), and evening primrose (Oenothera biennis L.). The soil was a fine sandy loam with 4% organic matter and pH 5.6. The experiment as conducted in a randomized complete block design with four replications and a plot size of ft by 12 ft. Herbicide treatments, supplemented with X-77 surfactant (0.5%), were applied on ugust 9, 1995 in a volume of25 gal/A at 34 psi. Field horsetail was 6 to 8 inches tall at the time f treatment. Fe treatments provided long-term control offield horsetail. Bentazon (1.5Ib ai/A), oxytluorfen (l Ib ai/A), sulfentrazone (0.5 Ib ai/A), and halosulfuron (0.094Ib ailA) had little or no effect 0 horsetail. Paraquat (l lb ailA), glufosinate (1.5 lb ai/A), 2,4-D ester (1.5 lb aelA), and triclop (lIb ae/A) burned down emerged horsetail, but new horsetail shoots emerged unaffected t e following spring. By 3 weeks after treatment, glyphosate (3 lb ailA) reduced horsetail vi or about 80%, and new shoots in 1996 were suppressed to a similar extent. Effects of asulam ( lb ailA) on horsetail were not apparent until the spring when new growth was . suppressed itiallyby 85%. Sulfometuron (0.094Ib ailA) activity on weeds was slow to develop, but no veg ation emerged in plots treated with sulfometuron until July 1996, at which time horsetail an annual grasses began to reinvade from the plot margins. Dichlobenil granules (6 lb ai/A), whic were applied on March 28, 1996, prevented emergence of horsetail and all other weeds exc t grasses through August. 01 hosate, glufosinate, and paraquat provided excellent postemergence control of all other weed , except paraquat did not control common purslane. In contrast, bentazon did not control any eeds other than annual sedge. Emerged annual sedge was also controlled by sulfentrazo e and suppressed by sulfometuron and halosulfuron. Dichlobenil and sulfometuron provided th best residual control of annual sedge, followed by halosulfuron and sulfentrazone. Emerged ual grasses were suppressed by asulam, oxytluorfen, and sulfometuron. Pigweed was control ed by triclopyr, 2,4-D, sulfometuron, and sulfentrazone; these same herbicides and oxytluorfen suppressed purslane. All treatments, except bentazon and oxytluorfen, controlled evening pri ose. In g neral, sulfometuron and dichlobenil resulted in the best residual control of field horsetail an most other weeds. 1 Assistant gricultural Scientist, The Connecticut Agricultural Experiment Station, Valley Laboratory Windsor, CT 06095.
15 EFFECTOF rREPLANT TILLAGEANDNICOSULFURONON WIRESTEMMUHLY CONTROLIN CORN . D. D. Lingenfelterand W. S. Curran' , ABSTRACf Wirestemjnuhly I (Muhlenberaiafrondosa (Poir.)Fernald)is a warm season,perennial grassspeciesthat]is becominga problemin conservationtillagesystems. Effectiveprograms currentlydo not existfor managingwirestemmuhlyin reduced-tillagecom. Therefore,the followingresearchwas designedto evaluatepreplanttillagewithandwithoutnicosulfuronfor wirestemmuhly ~ontrol in com (Zea J.lUlnL.). In 1994and 1995,field studieswereconductedin centralPennsylvaniaat locationswith establishedwires~.m muhlypopulations. Springprimarypreplanttillagetreatmentswere moldboardplow, chisel plow, heavydisk, and no-till. Secondarytillagewas performedwhere necessaryto ob an appropriateseedbed. Com was plantedin midto late Mayand followed with a burndow ! RE treatmentfor annualweed control. Nicosulfuronat 0.031Ib ailAplus 0.25% v/v nonionicsurfactantwas appliedpostemergencewhenwirestemmuhlywas 12to 18 inchestall and cop· was less than 24 inchestall (V4-V5stage). A split-plotdesignwiththree replicationswas in this study. The herbicidewas appliedwith a CO 2-backpack sprayerthat delivered20 gpa. End of season resultsfrom the studyshowedthat nicosulfuronin combinationwith moldboardPlow,tchiselplow, or heavydisk treatmentsprovidedgreaterthan92% controlof wirestemmuhly. Moldboardplow, chiselplow,and disk withouta POST treatmentwereless effective,only pr viding45 to 60% control. The year followingtillageandherbicideapplication, wirestemmuhlycontrolrangedfrom 89 to 98% for all tillagesystemsthatincludednicosulfuron. Tillagetreatment' withoutthe POSTherbicideprovidedlessthan45%control. In general,control in treatmentsthat includednicosulfuronwas betterthanfor treatmentswithoutthe herbicide. In 1994, : rn grain yield was80 bulA for no-tillwithoutnicosulfuronand 90 bulA with the herbicidetreatment, All othertreatments,exceptchiselplowand no POSTherbicide,yielded 100to 117bulAi Com yieldsfrom the 1995season,a droughtyear, rangedfrom 51 to 75 bulA. None of the comiination treatmentsdiffered. In summary,these resultsshow thatwirestemmuhlycan be moreeffectivelymanaged whena combinadonof controlmeasuresare used. In general,springprimarytillagefollowedby an applicationo~nicosulfuron was moreeffectivethantillageor herbicidealone. Com yieldwas not greatlyaffec by the presenceof wirestemmuhly,althoughcompetitiveindicesfor wirestem muhlyin com ha e not yet been studiedor established. For areaswheretillageis not feasible, nicosulfuronwill! suppressthe wirestemmuhlyuntiladditionalcontrolmeasurescan be accomplishedin lothercrops (e.g., soybeans). I 1 Ext. Asst. and soc. Prof. of <strong>Weed</strong> <strong>Science</strong>,Dept of Agronomy,The PennsylvaniaState University,Uni ersity Park, PA 16802
Page 1 and 2: 1 DE~LOPING BEST MANAGEMENT PRACTIC
Page 3 and 4: 3 MATERIALSANDMETHODS Experiments w
Page 5 and 6: I 5 I Table 3. Stand density of oat
Page 7 and 8: 7 TaL~NCEaFHNE~CU~TaCL~HarnM Larry
Page 9 and 10: 9 I CONTROLLING QUACKGRASS WITH CLE
Page 11 and 12: BELTSV~LLE 11 SUSTAINABLEAGRICULTUR
Page 13: Ii 13 I The 1996NEWSSCollegiateWeed
Page 17 and 18: 17 i PENNMUjLCH, A NEW MULCH FOR TU
Page 19 and 20: 19 cover the sta~es in the Northeas
Page 21 and 22: 21 I TABLEt CORN WEED CONTROL EFFIC
Page 23 and 24: 23 COMMON LAMBSQUARTERS CONTROL IN
Page 25 and 26: I I 25 I Table 2. Effectivaness of
Page 27 and 28: 27 PERFORMANCE OF PREEMERGENCE TREA
Page 29 and 30: I i I i I I 29 EFFECT OF TANK-MIXIN
Page 31 and 32: I 31 I EVALVATIONOF WEED CONTROLA
Page 33 and 34: I I i 33 I EFFECT$ OF EXP 31130A AN
Page 35 and 36: 35 Effect OfPO~T ApplicationTimingo
Page 37 and 38: II I ! I ! Ii I I 37 PREE~ERGENCE C
Page 39 and 40: I 39 U+ OF SLUDGE BASED FERTILIZERS
Page 41 and 42: i I 41 I EFFECT OF fSOXABEN APPLIED
Page 43 and 44: I 43 ~STCRABGRASS CONTROL AS lWO os
Page 45 and 46: I II 45 iI Gallery* f,r Weed Preven
Page 47 and 48: I POTENTIAL I I 47 USE OF EXP-31130
Page 49 and 50: I" i 49 j PFMERGENCE CONTROL OF PRO
Page 51 and 52: 51 TIIE E...·rL"",,- L OF TRINEXAP
Page 53 and 54: 53 PERF011MANICEOF ISOXAFLUTOLE IN
Page 55 and 56: 55 ISOXAFL OLE COMBINATIONSWITH PRE
Page 57 and 58: 57 Weed Interference in Full Season
Page 59 and 60: 59 HERBICIDE TRATEGIES FOR CONTROL
Page 61 and 62: 61 Table 1.Eff ct of WeedControlTre
Page 63 and 64: 63 DETECTION ND MOVEMENT PATTERN OF
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65 TRAILERING AFETY: A TRAINING COU
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67 EV ALUATIO OF WIT..DFLOWER ESTAB
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69 LlNGSNOW ECOSYSTEM PROJECT: MICR
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71 TABLE 1: Tree . jury provided by
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74 GSNOW ECOSYSTEM PROJECT: WHITE S
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16 cherry (Pnmus se otina ranks fou
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.J 78 Table 1. Density, (D), relati
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~---------_._-~---_.._--- 80 A NEW
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82 WEED AFFINITY GROUPS AS A TOOL I
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84 NEW TE HNIQUE TO COMPARE EFFICAC
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86 PRO UCTION PERFORMANCE OF GLYPHO
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88 Managing nterseeded Cover Crops
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-----------t----~--- 90 Since weed
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92 The mechanistic model (equ. I) a
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94 Exploring the Feasibility of Pro
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96 INHIBI ING THE DEVELOPMENT OF CI
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98 However it .ncreased the control
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100 LIVERWORT AND PEARLWORT MANAGEM
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102 ULFENTRAZONEAND HALOSULFURON:HE
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104 estern New York Nursery IPM Pro
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106 C MMONRAGWEEDCONTROLIN FIELD CO
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108 CGA-77102: A New Herbicide for
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110 POSTEMERGENCEWEEDCONTROLIN SOYB
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112 E FECTS OF REPEATEDLATE-WINTERH
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114 GSNOW ECOSYSTEl\1 PROJECT: NITR
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116 RESULTS AND DISCUSSION GI fosin
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---------T---~~-- 118 EVALUA ON OF
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120 B USB CONTROL PROVIDED BY LOW V
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------- 122 W VOLUMEWEED AND BRUSH
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124 EVA UATION OFGLYPHOSATEFOR DORM
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126 E ALUATION OF IMAZAMETH FOR WEE
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128 Presidential Address Delivered
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130 Ho much land can ten billion pe
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Waggone December 24, 1994 132 count
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Waggone December 24, 1994 134 25 Pa
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Waggone December 24, 1994 136 which
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December 24, 1994 138 sets the pecu
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----------+---- Waggone December 24
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Waggone December 24, 1994 142 soil
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Waggone December 24, 1994 144 ~oo~
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Waggoner December 24, 1994 146 350
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148 Appendix Calculate the environm
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150 alone ac eptably controls typic
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152 opportu ity to use sethoxydim a
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---------+----------- 154 IMPACT OF
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156 The STS® time line: • 1986 -
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-------_. __ ._._--- d •••..
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-----_._~-_._.__.- 160 SYNCBRONYTM.
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162 Government approvals for Roundu
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HH i ! 164 AG6101 l.oundup Ready®
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166 n Lib rty LinkTM soybeans will
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168 IMITMCORN YIELD PERFORMANCE* (H
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170 to $15 an ere depending upon ho
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172 e recent occurrence has been th
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174 He bicide was added to the tiss
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176 it can at ti es be a weed in Ke
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178 ty's main campus that Rhizocton
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180 weight conclu qualit treatm and
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182 during the st or 2nd growing se
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184 TABLE 1. Mean raspberry cover (
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186 (A) STEM VOLUME - SPRING TRTM.,
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188 concluded at 5.1 em of simulate
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190 ACKNOWLEDGEMENTS ank United Agr
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192 AGRICULTURE NEEDS MORE WEED SCI
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194 Who is going to provide the edu
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20 18 - 16 A v 14 e r 12 a g 10 e s
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198 50th Annual Business Meeting of
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200 • Graduate team winners were:
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202 solclose to the New Year, as it
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----~------ 204 e Committee Reports
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! I 206 I Administration $1,527.23
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208 Glickman comments that his "hig
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210 York Sta~e. It is still unclear
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I I I Bingham, SamuJ Wayne Virginia
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214 Cianessi, Leonard Nat. Center o
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L I • I I I I Langston, Vemon Dow
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__________ m---+---m__ .... 218 Rie
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-----------~ I I 220 Whalen, Mark Z
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Helicopter Applicators, Inc. Martin
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224 Employers of NEWSS members in 1
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.l I I I I 226 NEWSSPASTPRESIDENTS
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228 AWARD OF MERIT 1971 1972 1973 1
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1995 I I I 230 Fra~cis J. Webb •
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II II 232 1995 1'R~chard Ashly Univ
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234 1991 1992 1993 1994 1995 1996 1
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I, I 236 1989 - AmeriJan Cyanamid,
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--------_.~-------- 238 RESEARCH PO
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1995 1 - iAComparison of Broadleaf
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242 1960 1961 1962 . The Influence
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244 1975 1 - Control of Jimsonweed
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246 1984 1 - Pre-TransplantOxyfluor
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248 Common or Code name trade Name
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250 Common or Code name , rrade Nam
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252 I Common ot Code namel I I flur
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254 Common o~ Code name' I I i Trad
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256 Common or i Code name I Trade N
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258 , Ackley, J.A .• 7 Adams, R.G
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260 1 I 2,4-D 2, 14, 1~, 22, 23,28,
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262 I Agrosticpalus(ris 47, 48 Agro
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SUBJECT INDEX Application T~mings 4
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266 WEED INDEX Abutilon theop~rosti
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Vol. 51â1997 - NorthEastern Weed Science Society

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Vol. 51â1997 - NorthEastern Weed Science Society