Sensitivity to fungicides in the isolates of Phytophthora infestans (Mont.) de Bary in the Czech Republic from 2003 to 2008

Jana Mazáková, Miloslav Zouhar, Pavel Ryšánek, Vladimír Táborský, Ervín Hausvater and Petr Doležal
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Jana Mazáková: Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague-Suchdol, Czech Republic
Miloslav Zouhar: Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague-Suchdol, Czech Republic
Pavel Ryšánek: Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague-Suchdol, Czech Republic
Vladimír Táborský: Department of Plant Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague-Suchdol, Czech Republic
Ervín Hausvater: Department of Protection, Potato Research Institute in Havlíčkův Brod, Ltd., Havlíčkův Brod, Czech Republic
Petr Doležal: Department of Protection, Potato Research Institute in Havlíčkův Brod, Ltd., Havlíčkův Brod, Czech Republic

Plant Protection Science, 2011, vol. 47, issue 1, 5-12

Abstract: In the growing seasons from 2003 to 2008, 547 isolates of Phytophthora infestans from five regions in the Czech Republic were collected and examined for their sensitivity to the active ingredients (metalaxyl, dimethomorph and propamocarb-HCl) of frequently used fungicides. The response of the isolates to each of these substances was examined using the in vitro amended-agar method; in 352 of these isolates, the sensitivity to metalaxyl was also assessed by the floating leaf-disc assay. The majority of the isolates were sensitive (89.8%) to metalaxyl. Resistant isolates were found only in two of the sample years (2003 and 2008); they represented 58% of the samples in 2003 and only 29% in 2008. Four isolates from 2004 were found to be intermediate for their level of resistance. All the isolates that were tested were sensitive to dimethomorph and propamocarb-HCl; these particular substances completely suppressed mycelial growth at 1 µg a.i. per ml.

Keywords: late blight; fungicide resistance; metalaxyl; dimethomorph; propamocarb-hydrochloride (search for similar items in EconPapers)
Date: 2011
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpps:v:47:y:2011:i:1:id:16-2010-pps

DOI: 10.17221/16/2010-PPS

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