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Weed Management in No-Till Cotton (Gossypium hirsutum) with Thiazopyr

Published online by Cambridge University Press:  12 June 2017

Roger B. Batts  and
Alan C. York
Roger B. Batts
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
Alan C. York
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
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Abstract

Thiazopyr at 0.14, 0.28, and 0.42 kg ai/ha and pendimethalin at 1.1 kg ai/ha applied preemergence (PRE) were compared as components in weed management systems for no-till cotton. Mid- and late-season control of mixtures of large crabgrass, goosegrass, and fall panicum by thiazopyr at 0.28 kg/ha was 89 to 97% and 11 to 50%, respectively, compared with 11 to 38% midseason and 0 to 5% late-season control by pendimethalin. Thiazopyr at 0.42 kg/ha and pendimethalin controlled broadleaf signalgrass 44 and 0%, respectively, late in the season. Adding fluometuron PRE at 1.7 kg ai/ha had little to no effect on large crabgrass, goosegrass, and fall panicum control but increased broadleaf signalgrass control 47 to 79 percentage points compared with thiazopyr or pendimethalin alone. Late-season control of annual grasses by thiazopyr or pendimethalin plus fluometuron PRE followed by methazole plus MSMA early postemergence (POST)-directed and cyanazine plus MSMA late POST-directed was at least 95% at two locations and 80% at the third location. Common lambsquarters was controlled 54 and 95% in systems without and with fluometuron PRE, respectively. Acceptable control of ivyleaf, pitted, and tall morningglories at all locations and smooth pigweed at two of three locations was achieved only in systems with POST-directed herbicides. Adding POST-directed herbicides to systems with thiazopyr or pendimethalin plus fluometuron PRE increased cotton yield at two of three locations. Treatments had no effect on fiber quality.

Keywords

methazole, 2-(3,4-dichlorophenyl)-4-methyl-1,2,4-oxadiazolidine-3,5-dioneMSMA, monosodium salt of methylarsonic acidcommon lambsquarters, Chenopodium album L. # CHEALfall panicum, Panicum dichotomiflorum Michx. # PANDIgoosegrass, Eleusine indica (L.) Gaertn. # ELEINivyleaf morningglory, Ipomoea hederacea (L.) Jacq. # IPOHElarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSApitted morningglory, Ipomoea lacunosa L. IPOLAsmooth pigweed, Amaranthus hybridus L. # AMACHtall morningglory, Ipomoea purpurea (L.) Roth # PHBPUWeed controlcyanazinefluometuronmethazoleMSMApendimethalinAmaranthus hydridusBrachiaria platyphyllaChenopodium albumDigitaria sanguinalisEleusine indicaIpomoea hederaceaIpomoea lacunosaIpomoea purpureaPanicum dichotomiflorumAMACHBRAPPCHEALDIGSAELEINIPOHEIPOLAPANDIPHBPUPOST, postemergencePRE, preemergencePPI, preplant incorporated
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 580 - 585
Copyright
Copyright © 1997 by the Weed Science Society of America 

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