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Processing Tomato and Weed Response to Flufenacet plus Metribuzin

Published online by Cambridge University Press:  20 January 2017

Peter H. Sikkema ,
Allan S. Hamill ,
Mirwais M. Qaderi  and
Colleen Doucet
Peter H. Sikkema
Affiliation:
Weed Scientist, Ridgetown College, University of Guelph, Ridgetown, Ontario, Canada N0P 2C0
Allan S. Hamill*
Affiliation:
Research Scientist and former Postdoctoral Researcher, Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0
Mirwais M. Qaderi
Affiliation:
Research Associate, Department of Biology, University of Western Ontario, London, Ontario, Canada N6A 5B7
Colleen Doucet
Affiliation:
Research Scientist and former Postdoctoral Researcher, Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0
*
Corresponding author's E-mail: hamilla@agr.gc.ca
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Abstract

Field experiments were conducted in 1998, 1999, and 2000 at two locations (Harrow and Ridgetown) in southwestern Ontario to determine the biologically effective rates (I90) of a commercial formulation of flufenacet plus metribuzin for weed control and processing tomato tolerance. At the proposed label use rate, flufenacet plus metribuzin provided excellent (≥90%) early-season (22 to 29 d after planting) control of velvetleaf, good (80 to 89%) control of barnyardgrass and redroot pigweed, and fair (60 to 79%) control of common lambsquarters. Flufenacet plus metribuzin provided fair late-season (59 to 97 d after planting) control of redroot pigweed and common lambsquarters and poor (≤59%) control of barnyardgrass and velvetleaf. At Harrow and Ridgetown, I90 values for early-season weed control ranged from 70 to 1,300 g ai/ha and 50 to 1,900 g ai/ha, respectively. Flufenacet plus metribuzin provided poor weed control at Ridgetown. This result was not attributable to higher weed density or particular weed species but may have been caused by lack of rainfall and too low application rates for the medium-textured soil type. It is estimated that flufenacet plus metribuzin at 1,400 g/ha can control green foxtail season-long, whereas barnyardgrass and common lambsquarters would require 1,900 g/ha. Season-long control of velvetleaf and redroot pigweed would require application rates of 3,200 and 7,100 g/ha, respectively. Only slight early-season crop injury was observed, which was not reflected in yields. Optimum yields of tomatoes were obtained at Harrow at rates lower or slightly higher than the registered rates for corn and soybean. Tomato yields were higher at Harrow than at Ridgetown, which may have been due to differences in soil texture. Tomatoes grown in a medium-textured (Ridgetown) soil appeared to be less competitive against weeds than those grown in a coarse-textured soil (Harrow).

Keywords

Flufenacetmetribuzinbarnyardgrass, Echinochloa crusgalli (L.) P. Beauv. # ECHCGcommon lambsquarters, Chenopodium album L. # CHEALgreen foxtail, Setaria viridis (L.) P. Beauv. # SETVIredroot pigweed, Amaranthus retroflexus L. # AMAREvelvetleaf, Abutilon theophrasti Medik # ABUTHcorn, Zea mays L.soybean, Glycine max (L.) Merr.tomato, Lycospersicon esculentum Mill. ‘Heinz 9478’Crop injurypreplant incorporatedspecific herbicide rateweed densityIWM, integrated weed management
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 801 - 809
Copyright
Copyright © Weed Science Society of America 

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