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Droplet-Size Effects on Control of Chloris spp. with Six POST Herbicides

Published online by Cambridge University Press:  15 January 2019

J. Connor Ferguson
Affiliation:
Assistant Professor, Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS, USA
Bhagirath S. Chauhan
Affiliation:
Associate Professor, Queensland Alliance for Agriculture and Food Innovation (QAAFI), University of Queensland, Toowoomba, QLD, Australia
Rodolfo G. Chechetto
Affiliation:
Researcher, AgroEfetiva Serviços SS Ltda, Botucatu, São Paulo, SP, Brazil
Andrew J. Hewitt
Affiliation:
Senior Research Fellow, School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD, Australia
Steve W. Adkins
Affiliation:
Professor, School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD, Australia
Greg R. Kruger
Affiliation:
Weed Science and Application Technology Specialist, University of Nebraska–Lincoln, North Platte, NE, USA
Chris C. O’Donnell
Affiliation:
Research Fellow, School of Agriculture and Food Sciences, University of Queensland, Gatton, QLD, Australia
Corresponding

Abstract

Chloris spp. are warm-season grasses that outcompete crops for scarce resources throughout Australia. In Queensland, mild winters and increased adoption of conservation tillage practices have led to an increase of this warm-season grass family in winter crops. The objective of this study is to understand whether droplet size (nozzle type) effects herbicide efficacy of summer perennial grasses, as previous research found no effect of droplet size (nozzle type) on herbicide efficacy of winter annual grasses. A study to compare droplet-size (nozzle type) effects on control of windmillgrass and its domesticated relative, rhodesgrass, was conducted at the University of Queensland in Gatton, QLD, Australia. Results showed little difference in dry weight reductions for windmillgrass or rhodesgrass across droplet size (nozzle type). Paraquat applications with the TTI nozzle resulted in significantly lower dry weight reductions compared with other droplet-size sprays (nozzle types) for rhodesgrass. Glyphosate, imazamox plus imazapyr, and clodinafop resulted in commercially acceptable control for both species, regardless of the droplet size (nozzle type) selected, indicating droplet size (nozzle type) has relatively little impact on the efficacy of these herbicides. Proper nozzle selection can result in control of Chloris spp., a hard to control weed species, while reducing the occurrence of spray drift to nearby sensitive areas.

Type
Research Article
Copyright
© Weed Science Society of America, 2019. 

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Footnotes

Cite this article: Ferguson JC, Chauhan BS, Chechetto RG, Hewitt AJ, Adkins SW, Kruger GR, O’Donnell CC (2019) Droplet-size effects on control of Chloris spp. with six POST herbicides. Weed Technol 33:153–158. doi: 10.1017/wet.2018.99

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