The Appearance of Dicarboximide Resistance in Botrytis Cinerea in Queensland

A severe outbreak of grey mould on tomato crops in Bundaberg during May-Aug. 1985 occurred despite intensive spraying with benomyl, iprodione and procymidone. In screening tests with 52 isolates of B. cinerea from tomato fields at Bundaberg and 10 from strawberry fields where the use of dicarboximid...

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Bibliographic Details
Published in:Australasian plant pathology 1986, Vol.15 (1), p.24-25
Main Authors: O'brien, RG, Glass, RJ
Format: Article
Language:English
Subjects:
botrytis cinerea
fongicide
fungicidas
fungicides
queensland
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Summary:A severe outbreak of grey mould on tomato crops in Bundaberg during May-Aug. 1985 occurred despite intensive spraying with benomyl, iprodione and procymidone. In screening tests with 52 isolates of B. cinerea from tomato fields at Bundaberg and 10 from strawberry fields where the use of dicarboximides has been limited, all the tomato isolates made substantial growth on PDA amended with iprodione while the strawberry isolates failed to grow on these media. On media amended with iprodione, procymidone, vinclozolin and dicloran the tomato isolates showed cross-resistance between the fungicides while a strawberry isolate was sensitive to all 4 compounds. In additional tests all 21 tomato isolates and 6 of 10 from strawberry were resistant to benomyl and 1 showed slight growth on a dichlofluanid amended medium. These data provide the first indications of dicarboximide resistance in this fungus in Australia and also indicate that benomyl resistance is widespread in the Bundaberg and Redland Bay areas. Australasian Plant Pathology 15(1) 24 - 25 Full text doi:10.1071/APP9860024 © CSIRO 1986
ISSN:0815-3191
1448-6032
DOI:10.1071/APP9860024