Resistance to a single UK isolate ofColletotrichum acutatum in strawberry germplasm from Northern Europe |
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Authors: | D W Simpson C Q Winterbottom J A Bell M L Maltoni |
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Institution: | (1) Horticulture Research International, East Malling, West Malling, ME19 6BJ Kent, UK;(2) Present address: P.O. Box 73113, 95617-3113 Davis, California, USA;(3) Present address: Istituto Sperimentale per la Frutticoltura, Piazzale della Victoria, 15. 47100 Forli, Italy |
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Abstract: | Summary
Colletotrichum acutatum on strawberry was first introduced to the UK on runners of cultivar Brighton, which were imported from California in 1983.
Recently further outbreaks have been reported following the importation of infected runner plants from mainland Europe.
Phytosanitary precautions have so far been successful in controlling the disease but the current trend in the UK is for increasing
late season production. This increases the likelihood of there being fruiting plants when the environmental conditions are
favourable toC. acutatum.
Fifteen cultivars and 19 HRI breeding lines were tested for susceptibility toC. acutatum using the most pathogenic isolate found on plants imported into the UK. It is likely this isolate was originally of Californian
origin. Potted plants were spray inoculated and subsequently rated in the glasshouse using a disease severity rating (DSR)
with the range from 0–4, where a rating of 4 indicated severe disease symptoms.
In contrast to results from California and Italy standard deviations were variable and often large and consequently it was
considered unsafe to classify the susceptibility of the genotypes on the basis of mean DSR alone. Classification was thus
based on a combination of the mean value and the distribution of the scores but in some cases the results were inconclusive.
It was possible to classify five lines as having a high level of resistance (Elvira, Honeoye, EM99, EM224, EM255); six lines
had a useful level of resistance but did show symptoms on some plants (Cambridge Favourite, Gorella, Pandora, Pantagruella,
EM17 and EM290); five lines were highly susceptible (Elsanta, Redgauntlet, Tamella, EM237 and EM319). The remaining 18 lines
could not be classified with the same degree of certainty but 10 were probably resistant. |
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Keywords: | Anthracnose Colletotrichum acutatum Fragaria xananassa resistance strawberry |
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