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Weed Management in Fresh Market Spinach (Spinacia oleracea) with S-metolachlor

Published online by Cambridge University Press:  20 January 2017

Steven A. Fennimore ,
Richard F. Smith  and
Milton E. Mcgiffen Jr.
Steven A. Fennimore*
Affiliation:
Department of Vegetable Crops and Weed Science, University of California-Davis, c/o USDA-ARS, Salinas, CA 93905
Richard F. Smith
Affiliation:
University of California, Cooperative Extension, Monterey County, Salinas, CA 93901
Milton E. Mcgiffen Jr.
Affiliation:
Department of Botany and Plant Sciences, University of California-Riverside, Riverside, CA 92521
*
Corresponding author's E-mail: safennimore@ucdavis.edu.
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Abstract

Field studies were conducted with fresh market spinach to examine crop tolerance and weed control with S-metolachlor. S-metolachlor was applied preemergence (PRE) at rates of 0.56, 0.72, 1.06, and 1.41 kg/ha and compared with the commercial standard cycloate at 3.4 and 4.5 kg/ha. Spinach was generally tolerant of S-metolachlor at rates up to 1.06 kg/ha on all soil types. S-Metolachlor at 0.56 to 0.72 kg/ha and cycloate at 3.4 kg/ha provided >88% control of common purslane, nettleleaf goosefoot, and shepherd's purse. Control of common chickweed with S-metolachlor at ≥0.56 kg/ha was >80%, whereas cycloate at 3.4 to 4.5 kg/ha was ineffective. Hand-weeding times in plots treated with S-metolachlor at 0.56 and 0.72 kg/ha were similar or lower than hand-weeding times in plots treated with cycloate at 3.4 kg/ha. Greenhouse studies were conducted to compare the relative tolerance of fresh market spinach to S-metolachlor and metolachlor. The GR10 values for S-metolachlor and metolachlor were 1.57 and 2.03 kg/ha, respectively. At rates above 2.2 kg/ha S-metolachlor is less selective in spinach than metolachlor. S-metolachlor is safe for PRE use in fresh market spinach at rates up to 1.06 kg/ha.

Keywords

CycloatemetolachlorS-metolachlorS-enantiomercommon chickweed, Stellaria media L. Vill. # STEMEcommon purslane, Portulaca oleracea L. # POROLnettleleaf goosefoot, Chenopodium murale L. # CHEMUshepherd's-purse, Capsella bursa-pastoris L. Medik # CAPBPspinach, Spinacia oleracea L. # SPQOLHerbicide toleranceweed controlCAPBPCHEMUPOROLSPQOLSTEMEGR10, herbicide concentration required to reduce shoot dry weight by 10%PRE, preemergence
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 511 - 516
Copyright
Copyright © Weed Science Society of America 

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References

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