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Effect of Drip-Applied Metam-Sodium and S-Metolachlor on Yellow Nutsedge and Common Purslane in Polyethylene-Mulched Bell Pepper and Tomato

Published online by Cambridge University Press:  20 June 2017

Daniel M. Dayton ,
Sushila Chaudhari ,
Katherine M. Jennings ,
David W. Monks  and
Greg W. Hoyt
Daniel M. Dayton
Affiliation:
Graduate Student, Postdoctoral Research Scholar, Assistant Professor, and Professor and Associate Dean and Director, North Carolina Agricultural Research Service, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
Sushila Chaudhari*
Affiliation:
Graduate Student, Postdoctoral Research Scholar, Assistant Professor, and Professor and Associate Dean and Director, North Carolina Agricultural Research Service, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
Katherine M. Jennings
Affiliation:
Graduate Student, Postdoctoral Research Scholar, Assistant Professor, and Professor and Associate Dean and Director, North Carolina Agricultural Research Service, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
David W. Monks
Affiliation:
Graduate Student, Postdoctoral Research Scholar, Assistant Professor, and Professor and Associate Dean and Director, North Carolina Agricultural Research Service, Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695
Greg W. Hoyt
Affiliation:
Professor, Department of Soil Science, North Carolina State University, Mills River, NC 28759
*
* Corresponding author’s E-mail: schaudh@ncsu.edu
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Abstract

Field studies were conducted to determine the effect of metam sodium and S-metolachlor applied through drip irrigation on yellow nutsedge, common purslane, bell pepper, and tomato (injury and yield) in plasticulture. Treatments consisted of weed-free, weedy, S-metolachlor alone at 0.85 kg ha-1, methyl bromide, metam sodium (43, 86, 176, and 358 kg ai ha–1) alone, and metam sodium (43, 86, 176, and 358 kg ai ha–1) followed by S-metolachlor at 0.85 kg ha–1. Metam sodium and S-metolachlor was applied preplant 2 wk before and 2 wk after transplanting (WAT) through drip irrigation, respectively. No injury was observed to bell pepper and tomato from metam sodium alone, or metam sodium fb S-metolachlor treatments. With the exception of yellow nutsedge density 15 WAT in bell pepper, herbicide program did not influence yellow nutsedge and common purslane density at 4 and 6 WAT and bell pepper and tomato yield. At 15 WAT, yellow nutsedge density was lower in treatments that received metam sodium fb S-metolachlor compared to those treatments that only received metam sodium. Drip-applied metam sodium at 176 and 358 kg ha–1 in both bell pepper and tomato provided similar control of common purslane, and yellow nutsedge, produced comparable yields, and failed to elicit any negative crop growth responses when compared to MeBr. In conclusion, metam sodium at 176 and 358 kg ha–1 fb S-metolachlor 0.85 kg ha–1 is an effective MeBr alternative for season long weed control in plasticulture bell pepper and tomato.

Keywords

Metam-sodiumS-metolachlorcommon purslane, Portulaca oleracea L.yellow nutsedge, Cyperus esculentus L.bell pepper, Capsicum annuum L.tomato, Solanum lycopersicum LCrop tolerance, drip-applied, methyl bromide alternative
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 31 , Issue 3 , June 2017 , pp. 421 - 429
Copyright
© Weed Science Society of America, 2017 

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Footnotes

Associate Editor for this paper: Steve Fennimore, University of California, Davis.

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