Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain
BACKGROUND: Cucurbit powdery mildew elicited by Podosphaera fusca (Fr.) U Braun & N Shishkoff limits crop production in Spain. Disease control is largely dependent on fungicides such as sterol demethylation inhibitors (DMIs). Fungicide resistance is an increasing problem in this pathogen. To ove...
| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
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John Wiley & Sons Ltd.
2010
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| Online Access: | http://www.ncbi.nlm.nih.gov/pubmed/20533378 http://hdl.handle.net/20.500.11937/21960 |
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| author | Lopez-Ruiz, Fran Perez-García, A. Fernandez-Ortuno, D. Romero, D. García, E. de Vicente, A. Brown, J. Tores, J. |
| author_facet | Lopez-Ruiz, Fran Perez-García, A. Fernandez-Ortuno, D. Romero, D. García, E. de Vicente, A. Brown, J. Tores, J. |
| author_sort | Lopez-Ruiz, Fran |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | BACKGROUND: Cucurbit powdery mildew elicited by Podosphaera fusca (Fr.) U Braun & N Shishkoff limits crop production in Spain. Disease control is largely dependent on fungicides such as sterol demethylation inhibitors (DMIs). Fungicide resistance is an increasing problem in this pathogen. To overcome such risk, it is necessary to design rational control programmes basedupon knowledge of field resistance. The aim of this study was to investigate the state of DMI sensitivity of Spanish P. fusca populations and provide tools for improved diseasemanagement.RESULTS: Using a leaf-disc assay, sensitivity to fenarimol,myclobutanil and triadimenol of 50 isolates of P. fusca was analysed to determine discriminatory concentrations between sensitive and resistant isolates. As no clearly different groups of isolates could be identified, discriminatory concentrations were established on the basis of maximum fungicide field application rate, 100 mg L-1 for the three fungicides tested. Subsequently, a survey of DMI resistance was carried out in different provinceslocated in the south central area of Spain during the cucurbit growing seasons in 2002, 2003 and 2004. Examination of a collection of 250 isolates revealed that 23% were resistant to fenarimol and 7% to triadimenol, the provinces of Almería, Badajoz and Murcia being the locations with the highest frequencies of resistance. By contrast, no resistance to myclobutanil was found.CONCLUSION: Results show that fenarimol and, to a lesser extent, triadimenol have become less efficient for controllingcucurbit powderymildew in Spain. These are important observations that should lead to reconsideration of the current diseasemanagement programmes. |
| first_indexed | 2025-11-14T07:41:35Z |
| format | Journal Article |
| id | curtin-20.500.11937-21960 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:41:35Z |
| publishDate | 2010 |
| publisher | John Wiley & Sons Ltd. |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-219602017-02-28T01:36:46Z Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain Lopez-Ruiz, Fran Perez-García, A. Fernandez-Ortuno, D. Romero, D. García, E. de Vicente, A. Brown, J. Tores, J. cross-resistance sterol biosynthesis inhibitors cucurbits fungicide resistance powdery mildew azoles BACKGROUND: Cucurbit powdery mildew elicited by Podosphaera fusca (Fr.) U Braun & N Shishkoff limits crop production in Spain. Disease control is largely dependent on fungicides such as sterol demethylation inhibitors (DMIs). Fungicide resistance is an increasing problem in this pathogen. To overcome such risk, it is necessary to design rational control programmes basedupon knowledge of field resistance. The aim of this study was to investigate the state of DMI sensitivity of Spanish P. fusca populations and provide tools for improved diseasemanagement.RESULTS: Using a leaf-disc assay, sensitivity to fenarimol,myclobutanil and triadimenol of 50 isolates of P. fusca was analysed to determine discriminatory concentrations between sensitive and resistant isolates. As no clearly different groups of isolates could be identified, discriminatory concentrations were established on the basis of maximum fungicide field application rate, 100 mg L-1 for the three fungicides tested. Subsequently, a survey of DMI resistance was carried out in different provinceslocated in the south central area of Spain during the cucurbit growing seasons in 2002, 2003 and 2004. Examination of a collection of 250 isolates revealed that 23% were resistant to fenarimol and 7% to triadimenol, the provinces of Almería, Badajoz and Murcia being the locations with the highest frequencies of resistance. By contrast, no resistance to myclobutanil was found.CONCLUSION: Results show that fenarimol and, to a lesser extent, triadimenol have become less efficient for controllingcucurbit powderymildew in Spain. These are important observations that should lead to reconsideration of the current diseasemanagement programmes. 2010 Journal Article http://hdl.handle.net/20.500.11937/21960 http://www.ncbi.nlm.nih.gov/pubmed/20533378 John Wiley & Sons Ltd. restricted |
| spellingShingle | cross-resistance sterol biosynthesis inhibitors cucurbits fungicide resistance powdery mildew azoles Lopez-Ruiz, Fran Perez-García, A. Fernandez-Ortuno, D. Romero, D. García, E. de Vicente, A. Brown, J. Tores, J. Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain |
| title | Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain |
| title_full | Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain |
| title_fullStr | Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain |
| title_full_unstemmed | Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain |
| title_short | Sensitivities to DMI fungicides in populations of Podosphaera fusca in south central Spain |
| title_sort | sensitivities to dmi fungicides in populations of podosphaera fusca in south central spain |
| topic | cross-resistance sterol biosynthesis inhibitors cucurbits fungicide resistance powdery mildew azoles |
| url | http://www.ncbi.nlm.nih.gov/pubmed/20533378 http://hdl.handle.net/20.500.11937/21960 |