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Spray Retention on Green Foxtail (Setaria viridis) and its Effect on Weed Control Efficacy by Pyricularia setariae

Published online by Cambridge University Press:  20 January 2017

Gary Peng ,
Thomas M. Wolf ,
Kelly N. Byer  and
Brian Caldwell
Gary Peng*
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Saskatoon Research Center, 107 Science Place, Saskatoon, SK S7N 0X2, Canada
Thomas M. Wolf
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Saskatoon Research Center, 107 Science Place, Saskatoon, SK S7N 0X2, Canada
Kelly N. Byer
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Saskatoon Research Center, 107 Science Place, Saskatoon, SK S7N 0X2, Canada
Brian Caldwell
Affiliation:
Agriculture and Agri-Food Canada (AAFC), Saskatoon Research Center, 107 Science Place, Saskatoon, SK S7N 0X2, Canada
*
Corresponding author's E-mail: pengg@agr.gc.ca
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Abstract

The importance of spray retention to the biocontrol of green foxtail with Pyricularia setariae was characterized using airbrush and broadcast sprayers at variable application volumes. Spray retention was determined by measuring amounts of a tracer dye solution on treated plants using fluorescence spectrophotometry. Depending on the droplet size, broadcast spraying at 1,000 to 2,000 L/ha produced a level of retention equivalent to that of airbrush spraying until runoff. The trend of P. setariae spore retention on green foxtail was similar to that of liquid retention. Broadcasting P. setariae at volumes producing equivalent spray retention to that of airbrush inoculation resulted in a similar level of weed control under greenhouse conditions. Reducing broadcast volume from 2,000 to 250 L/ha lowered biocontrol efficacy only slightly, when the concentration of P. setariae was increased proportionally to keep the applied fungal dose the same. A nozzle with a fine droplet spectrum (volume median diameter [VMD] 207 μm) had a significantly greater retention efficiency than a coarse spray (VMD 325 μm), but this retention difference was not translated into consistent enhancement of biocontrol efficacy. Higher retention increases may be necessary for more substantial improvement in biocontrol of green foxtail by P. setariae.

Keywords

Green foxtail, Setaria viridis (L.) Beauv. # SETVIPyricularia setariae Nisikado [synonym Pyricularia grisea (Cooke) Sacc.]Application volumebiocontroldroplet sizemycoherbicideAAFC, Agriculture and Agri-Food CanadaAAV, actual application volumeVMD, volume median diameter
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 1 , March 2005 , pp. 86 - 93
Copyright
Copyright © Weed Science Society of America 

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