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Cornus anthracnose is a fungal disease that kills leaves and young shoots of some North American Cornus species (dogwoods). Infections cause dead blotches on leaves and die-back of young stems.
Cornus anthracnose is a fungal disease caused by Discula destructiva, which arrived in the UK from North America in the late 1990s.
It infects and kills the leaves and young shoots of some North American Cornus species (dogwoods). Cornus florida is particularly susceptible, Cornus nuttallii and Cornus kousa may also be attacked. Native UK Cornus species appear unaffected.
Damage occurs from late spring until leaf fall in the autumn.
You may see the following symptoms:
The fungicides tebuconazole (Bayer Fungus Fighter Concentrate), tebuconazole with trifloxystrobin (Bayer Fungus Fighter Plus), and triticonazole (Scotts Fungus Clear Ultra and Scotts Fungus Clear Ultra Gun) are approved for use against various fungal diseases on ornamental plants and could be used, but there is no specific information on their efficacy and no claims are made by the manufacturers for control of this particular disease.
Inclusion of a fungicide product does not indicate a recommendation or endorsement by the RHS. It is a list of products currently available to the home gardener.
Fungicides for gardeners (Adobe Acrobat pdf document outlining fungicides available to gardeners)
Chemicals: using a sprayerChemicals: using safely and effectivelyChemicals: storing and disposing safely
The fungus Discula destructiva causes extensive damage in North America to the native Cornus species, which are an important landscape feature. The disease is known there as anthracnose and was first noted in the 1970s. The fungus is not thought to be native to North America, but its origins are unknown. It was first detected in the UK in the late 1990s and was probably introduced accidentally on infected plant material.
The fungus produces very small, pimple-like fruiting bodies on dead leaves and stems and in wet weather minute spores are released from these and dispersed by rain-splash, wind-blown rain and, probably, by animals and birds. Wet conditions are required for infection.
No other spore types are known and it is assumed that the fungus can remain dormant in affected twigs and bark during the winter, to produce fresh spores the following spring.
Brown leaves on woody plantsCoppicingCornusCoral spotDisposing of diseased materialPruning for colourful stemsTrees and shrubs with attractive barkWhy has my tree or shrub died?Willow anthracnose, scab and canker
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