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Baseline sensitivity of Australian Phoma ligulicola isolates from pyrethrum to azoxystrobin and difenoconazole


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Jones, SJ ORCID: 0000-0003-1014-4772, Pethybridge, SJ, Hay, FS, Groom, T and Wilson, CR 2007 , 'Baseline sensitivity of Australian Phoma ligulicola isolates from pyrethrum to azoxystrobin and difenoconazole' , Journal of Phytopathology, vol. 155 , pp. 377-380 , doi: 10.1111/j.1439-0434.2007.01241.x.

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Ray blight caused by Phoma ligulicola is an important disease of pyrethrum in Australia, and successful management relies upon the fungicides, azoxystrobin and difenoconazole. Azoxystrobin and difenoconazole were introduced into pyrethrum production in 2001. The sensitivity of P. ligulicola isolates collected in 2003 to azoxystrobin (n ¼ 56) and difenoconazole (n ¼ 61) was tested. Testing for sensitivity to azoxystrobin and difenoconazole used a conidial germination and mycelial growth assay respectively. For each fungicide, the effective dose required to reduce mycelial growth or conidial germination by 50% (EC50) was determined by probit analysis. The EC50 values ranged from 0.007 to 0.193 lg/ml for azoxystrobin and 0.04 to 13.8 lg/ml for difenoconazole. No evidence was found for cross-resistance between azoxystrobin and difenoconazole in this baseline population. This information serves as important baseline data for tracking future changes in sensitivities of P. ligulicola to these fungicides.

Item Type: Article
Authors/Creators:Jones, SJ and Pethybridge, SJ and Hay, FS and Groom, T and Wilson, CR
Journal or Publication Title: Journal of Phytopathology
Publisher: Blackwell Verlag GmbH
ISSN: 0931-1785
DOI / ID Number: 10.1111/j.1439-0434.2007.01241.x
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