ISHS Acta Horticulturae 177: IV International Symposium on Flower Bulbs
NARCISSUS SMOULDER (SCLEROTINIA NARCISSICOLA GREG.) - A DISEASE RELATED TO HOST INJURY |
| Author: | G.R. Dixon |
| Abstract:
The aetiology of smoulder disease of Narcissus caused by Sclerotinia (Botrytis) narcissicola Greg, has largely been explained from information of an observational nature. In this study the relationship between tissue damage and subsequent Invasion related to epidemic development is more critically examined. Nil, slight and severe damage treatments were imposed by different forms of flower harvesting. Over a four-year exposure period to natural infection the mean number of plants in the most severe damage treatment rose from 2.4 to 18.8 per cent. Results from this experiment are discussed in terms of a proposed cycle of disease development for S. narcissicola. The more generalised role of tissue damage is considered for this and other pathogens with anamorphic Botrytis states. | |
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