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Raspberry spur blight is a fungal disease of raspberries causing purple patches on canes. It rarely kills raspberries, but can reduce yield severely by weakening the canes and killing buds.
Spur blight is a disease of raspberries caused by the fungus Didymella applanata. It appears from late summer and persists on infected canes until the following year.
It mainly affects raspberries and occasionally loganberries. It is particularly common during wet seasons.
You may see the following symptoms:
No fungicides are available to home gardeners for the control of raspberry spur blight.
Didymella applanata produces two spore types. The first type starts the infection on the new canes in the spring, while the second causes further spread during the summer. Infection usually occurs via the leaf stalks or buds, and is favoured by wet weather.
Overcrowded canes, and those that have received too much nitrogen, are more prone to attack.
RaspberryRaspberry beetleRaspberry cane blightRaspberry leaf and bud miteRaspberry rustRaspberry virusesSpotted wing drosophila
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