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- Title
Dicarboximide resistance in <em> Botrytis cinerea</em> in protected lettuce.
- Authors
Wang, Zu-Nan; Coley-Smith, J.R.; Wareing, P.W.
- Abstract
In survey of protected lettuce crops in the Humberside area of the UK during 1984-5, 47.3% of Botrytis cinerea isolates were resistant to dicarboximides and 25% to benomyl. Dicarboximide-resistant isolates obtained direct from the field had a moderate degree of resistance with ED30 value for mycelial growth on agar of 1.0-2.4 µg/ml vinclozolin for all except two of 30 isolates. Isolates which were resistant to vinclozolin were also resistant to iprodione, myclozolin and procymidone. Thirth dicarboximide-resistant isolates obtained direct from the field were capable of infecting cucumber cotyledons sprayed with field-strength Ronilan (250 µg/ml vinclozolin) whereas sensitive strains were not. Strains showing different degrees of resistance of dicarboximides developed after incubation of sensitive and resistant strains on agar supplemented with vinclozolin. Some of these strains had ED30 values for mycelial growth on agar of more than 100 µg/ml vinclozolin. No highly resistant isolates were obtained direct from the field. Resistance to dicarboximides in field isolates was stable.
- Subjects
HUMBERSIDE (England); ENGLAND; BOTRYTIS cinerea; LETTUCE diseases &; pests; PLANT diseases; VINCLOZOLIN
- Publication
Plant Pathology, 1986, Vol 35, Issue 4, p427
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/j.1365-3059.1986.tb02039.x