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Assessing the Belgian potato Alternaria population for sensitivity to fungicides with diverse modes of action

Sofie Landschoot UGent, Michiel Vandecasteele UGent, Jasper Carrette, Bernard De Baets UGent, Monica Höfte UGent, Kris Audenaert UGent and Geert Haesaert UGent (2017) EUROPEAN JOURNAL OF PLANT PATHOLOGY. 148(3). p.657-672
abstract
Early blight and brown spot, caused by respectively Alternaria solani and Alternaria alternata, can lead to severe yield losses in potato-growing areas. To date, fungicide application is the most effective measure to control the disease. However, in recent years, a reduced sensitivity towards several active ingredients has been reported. To shed light on this issue, Alternaria isolates were collected from different potato fields in Belgium during two growing seasons. Subsequently, the sensitivity of these isolates was assessed using four widely used fungicides with different modes of action. Demethylation inhibitors, quinone outside inhibitors, a dithiocarbamate and a carboxylic acid amide were included in this study. Although all fungicides reduced spore germination and vegetative growth of Alternaria species to some extent, the interspecies sensitivity was very variable. In general, A. solani was more suppressed by the fungicides compared to A. alternata. The effectiveness of the dithiocarbamate mancozeb was high, whereas the quinone outside inhibitor azoxystrobin showed a limited activity, especially towards A. alternata. Therefore, a subset of the A. alternata and A. solani isolates was tested for the presence of, respectively, the G143A substitution and the F129L substitution in the cytochrome b. The frequency of A. alternata isolates bearing the resistant G143A allele (approximately 65%) was comparable in both sampling years, although sensitivity of isolates decreased during the growing season. This finding points to a shift of the population towards resistant isolates. Both the European genotype I and American genotype II were present in the A. solani population, with genotype I being the most prevalent. None of the genotype I isolates carried the F129L substitution, whereas in 83% of the genotype II isolates this substitution was present. Our results demonstrate for the first time that the Belgian Alternaria population on potato comprises a considerable broad spectrum of isolates with different sensitivity to fungicides.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
Alternaria, Fungicides, Potato, Resistance, EARLY BLIGHT, CHEMICAL CONTROL, QOI FUNGICIDES, SOUTH-AFRICA, RESISTANCE, SOLANI, PHYTOPHTHORA, STRATEGIES, IMPACT, RISK
journal title
EUROPEAN JOURNAL OF PLANT PATHOLOGY
Eur. J. Plant Pathol.
volume
148
issue
3
pages
657 - 672
Web of Science type
Article
Web of Science id
000402459300016
ISSN
0929-1873
1573-8469
DOI
10.1007/s10658-016-1123-3
language
English
UGent publication?
yes
classification
A1
additional info
the first two authors contributed equally to this work
copyright statement
I have transferred the copyright for this publication to the publisher
id
8524666
handle
http://hdl.handle.net/1854/LU-8524666
date created
2017-06-22 07:40:54
date last changed
2017-09-07 07:30:18
@article{8524666,
  abstract     = {Early blight and brown spot, caused by respectively Alternaria solani and Alternaria alternata, can lead to severe yield losses in potato-growing areas. To date, fungicide application is the most effective measure to control the disease. However, in recent years, a reduced sensitivity towards several active ingredients has been reported. To shed light on this issue, Alternaria isolates were collected from different potato fields in Belgium during two growing seasons. Subsequently, the sensitivity of these isolates was assessed using four widely used fungicides with different modes of action. Demethylation inhibitors, quinone outside inhibitors, a dithiocarbamate and a carboxylic acid amide were included in this study. Although all fungicides reduced spore germination and vegetative growth of Alternaria species to some extent, the interspecies sensitivity was very variable. In general, A. solani was more suppressed by the fungicides compared to A. alternata. The effectiveness of the dithiocarbamate mancozeb was high, whereas the quinone outside inhibitor azoxystrobin showed a limited activity, especially towards A. alternata. Therefore, a subset of the A. alternata and A. solani isolates was tested for the presence of, respectively, the G143A substitution and the F129L substitution in the cytochrome b. The frequency of A. alternata isolates bearing the resistant G143A allele (approximately 65\%) was comparable in both sampling years, although sensitivity of isolates decreased during the growing season. This finding points to a shift of the population towards resistant isolates. Both the European genotype I and American genotype II were present in the A. solani population, with genotype I being the most prevalent. None of the genotype I isolates carried the F129L substitution, whereas in 83\% of the genotype II isolates this substitution was present. Our results demonstrate for the first time that the Belgian Alternaria population on potato comprises a considerable broad spectrum of isolates with different sensitivity to fungicides.},
  author       = {Landschoot, Sofie and Vandecasteele, Michiel and Carrette, Jasper and De Baets, Bernard and H{\"o}fte, Monica and Audenaert, Kris and Haesaert, Geert},
  issn         = {0929-1873},
  journal      = {EUROPEAN JOURNAL OF PLANT PATHOLOGY},
  keyword      = {Alternaria,Fungicides,Potato,Resistance,EARLY BLIGHT,CHEMICAL CONTROL,QOI FUNGICIDES,SOUTH-AFRICA,RESISTANCE,SOLANI,PHYTOPHTHORA,STRATEGIES,IMPACT,RISK},
  language     = {eng},
  number       = {3},
  pages        = {657--672},
  title        = {Assessing the Belgian potato Alternaria population for sensitivity to fungicides with diverse modes of action},
  url          = {http://dx.doi.org/10.1007/s10658-016-1123-3},
  volume       = {148},
  year         = {2017},
}

Chicago
Landschoot, Sofie, Michiel Vandecasteele, Jasper Carrette, Bernard De Baets, Monica Höfte, Kris Audenaert, and Geert Haesaert. 2017. “Assessing the Belgian Potato Alternaria Population for Sensitivity to Fungicides with Diverse Modes of Action.” European Journal of Plant Pathology 148 (3): 657–672.
APA
Landschoot, S., Vandecasteele, M., Carrette, J., De Baets, B., Höfte, M., Audenaert, K., & Haesaert, G. (2017). Assessing the Belgian potato Alternaria population for sensitivity to fungicides with diverse modes of action. EUROPEAN JOURNAL OF PLANT PATHOLOGY, 148(3), 657–672.
Vancouver
1.
Landschoot S, Vandecasteele M, Carrette J, De Baets B, Höfte M, Audenaert K, et al. Assessing the Belgian potato Alternaria population for sensitivity to fungicides with diverse modes of action. EUROPEAN JOURNAL OF PLANT PATHOLOGY. 2017;148(3):657–72.
MLA
Landschoot, Sofie, Michiel Vandecasteele, Jasper Carrette, et al. “Assessing the Belgian Potato Alternaria Population for Sensitivity to Fungicides with Diverse Modes of Action.” EUROPEAN JOURNAL OF PLANT PATHOLOGY 148.3 (2017): 657–672. Print.