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Glyphosate-resistant Hairy Fleabane (Conyza bonariensis) in Spain

Published online by Cambridge University Press:  20 January 2017

Jose M. Urbano ,
Ana Borrego ,
Vanessa Torres ,
Juan M. Leon ,
Cristobal Jimenez ,
Giovanni Dinelli  and
Jasper Barnes
Jose M. Urbano*
Affiliation:
Departmento C., Agroforestales, Universidad de Sevilla, 41013 Sevilla, Spain
Ana Borrego
Affiliation:
Departmento C., Agroforestales, Universidad de Sevilla, 41013 Sevilla, Spain
Vanessa Torres
Affiliation:
Departmento C., Agroforestales, Universidad de Sevilla, 41013 Sevilla, Spain
Juan M. Leon
Affiliation:
Departmento C., Agroforestales, Universidad de Sevilla, 41013 Sevilla, Spain
Cristobal Jimenez
Affiliation:
Departmento C., Agroforestales, Universidad de Sevilla, 41013 Sevilla, Spain
Giovanni Dinelli
Affiliation:
Departmento di Scienze e Tecnologie Agroambientali, Universitá di Bologna, 40127 Bologna, Italy
Jasper Barnes
Affiliation:
Syngenta Crop Protection, Basel, Switzerland
*
Corresponding author's E-mail: urbano@us.es
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Abstract

Forty-three Spanish populations of hairy fleabane, sampled from perennial crop locations, were studied under controlled and field conditions to confirm and characterize glyphosate resistance. In the initial screening, under controlled conditions, significant differences in glyphosate response between locations and among plant progenies within location were observed. From the initial screening, six populations (five potentially resistant [R] and one susceptible [S]) were selected, and a dose–response experiment was conducted to determine the resistance factor. The resistance factor was close to 10× for the most resistant population. In addition, the glyphosate response of R and S populations was dependant on phenological stages: the glyphosate rate required for control increased as a function of plant age. Finally, the resistance was confirmed with field trials conducted in five locations (one S and four R previously studied under controlled conditions). The field trials were also used to find alternative solutions for Spanish farmers to control resistant hairy fleabane populations.

Keywords

Flazasulfuronfluroxypyrglyphosateglufosinatehairy fleabane, Conyza bonariensis (L.) Cronq. ERIBOField trialsno-till cropsresistance
Type
Research
Information
Weed Technology , Volume 21 , Issue 2 , June 2007 , pp. 396 - 401
Copyright
Copyright © Weed Science Society of America 

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