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

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Jones, SJ and Pethybridge, SJ and Hay, FS and Groom, T and Wilson, CR (2007) Baseline sensitivity of Australian Phoma ligulicola isolates from pyrethrum to azoxystrobin and difenoconazole. Journal of Phytopathology, 155. pp. 377-380. ISSN 0931-1785

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Abstract

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
Journal or Publication Title: Journal of Phytopathology
Publisher: Blackwell Verlag GmbH
Page Range: pp. 377-380
ISSN: 0931-1785
Identification Number - DOI: 10.1111/j.1439-0434.2007.01241.x
Additional Information:

The definitive version is available online at
http://www.informaworld.com/smpp/content?

Date Deposited: 07 Apr 2008 14:14
Last Modified: 18 Nov 2014 03:33
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