Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa
| dc.contributor.author | Fourie, P. H. | en_ZA |
| dc.contributor.author | Holz, G. | en_ZA |
| dc.date.accessioned | 2017-06-02T08:11:10Z | |
| dc.date.available | 2017-06-02T08:11:10Z | |
| dc.date.issued | 2001 | |
| dc.description | CITATION: Fourie, P. H. & Holz, G. 2001. Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa. South African Journal of Enology & Viticulture, 22(1):3-7, doi:10.21548/22-1-2158. | en_ZA |
| dc.description | The original publication is available at http://www.journals.ac.za/index.php/sajev | en_ZA |
| dc.description.abstract | The sensitivity to folpet of Botrytis cinerea isolates obtained from table grape vineyards in the Western Cape province of South Africa with a known history of dicarboximide (DC) resistance and high-schedule DC and folpet programmes was investigated. In the Simondium vineyards, 61 % of the B. cinerea isolates from Dan-hen-Hannah and 20% of the isolates from Waltham Cross were resistant to iprodione. In the Northern Paarl vineyards, 95% of the isolates from Dan-hen-Hannah and 95% of the isolates from Waltham Cross were designated resistant. In the case of the iprodione-sensitive isolates from vineyards in Simondium, folpet ECso values ranged from 4.9 to 29.1 μg/mL for the Dan-hen-Hannah and 15.0 to 43.5 μg/mL for the Waltham Cross sub-populations, respectively. Folpet ECso values of the iprodione-resistant isolates, on the other hand, ranged from 19.7 to above 100 μg/mL for the Dan-hen-Hannah subpopulation. In the Northern Paarl subpopulations, where the isolates were predominantly iprodione-resistant, folpet ECso values of the latter isolates ranged from 21.5 to above 100 μg/mL. Similar shifts in folpet sensitivity were displayed by ultra-low- and low-level DC-resistant B. cinerea isolates obtained from other regional subpopulations. The results indicated incomplete cross-resistance between iprodione and folpet. This finding suggests that early increases in DC resistance frequencies in B. cinerea, observed prior to DC application in vineyards under the high-schedule DC and folpet programmes, can be attributed to incomplete cross-resistance to these fungicides in sub-populations of the pathogen. | en_ZA |
| dc.description.uri | http://www.journals.ac.za/index.php/sajev/article/view/2158 | |
| dc.description.version | Publisher's version | en_ZA |
| dc.format.extent | 5 pages | en_ZA |
| dc.identifier.citation | Fourie, P. H. & Holz, G. 2001. Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa. South African Journal of Enology & Viticulture, 22(1):3-7, doi:10.21548/22-1-2158 | en_ZA |
| dc.identifier.issn | 2224-7904 (online) | |
| dc.identifier.issn | 0253-939X (print) | |
| dc.identifier.other | doi:10.21548/22-1-2158 | |
| dc.identifier.uri | http://hdl.handle.net/10019.1/101689 | |
| dc.language.iso | en_ZA | en_ZA |
| dc.publisher | South African Society for Enology and Viticulture | en_ZA |
| dc.rights.holder | South African Society for Enology and Viticulture | en_ZA |
| dc.subject | Grapes -- Diseases and pests | en_ZA |
| dc.subject | Resistance of Botrytis cinerea to fungicide | en_ZA |
| dc.subject | Table grape vineyards -- South Africa -- Western Cape | en_ZA |
| dc.title | Incomplete cross-resistance to folpet and iprodione in botrytis cinerea from grapevine in South Africa | en_ZA |
| dc.type | Article | en_ZA |