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These fungal diseases of camellias cause brown leaf blotches, premature leaf loss and twig or branch dieback. They are most damaging on young plants or newly propagated material.
Common name Camellia leaf blightScientific name Monochaetia karstenii and Pestalotiopsis guepiniPlants affected Camellia spp.Main symptoms Brown leaf blotches, premature leaf loss and twig or branch diebackCaused by FungiTiming Following prolonged wet periods throughout the year
Camellia leaf blight is a fungal disease caused by one of two fungal pathogens: Monochaetia karstenii and Pestalotiopsis guepini. The development of the disease is favoured by wetness on the leaves and any factors that weaken or damage the foliage.
You may see the following symptoms:
There are no fungicides available to amateur gardeners with specific recommendations for the control of Camellia leaf blight. However, 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 labelled for the control of a number of other diseases on ornamental plants, and may give some control of Camellia leaf blight.
The following products contain a combination of both insecticide and fungicide, enabling the control of both insect pests and disease: myclobutanil containing cypermethrin (Bayer MultiRose 2, Doff Rose Shield, Vitax Rosegarde, Westland Rose Rescue); tebuconazole containing deltamethrin (Bayer Multirose Concentrate 2), and triticonazole containing acetamiprid (Scotts Roseclear Ultra and Scotts Roseclear Ultra Gun). When a proprietary product contains an insecticide as well as a fungicide it would be preferable to use an alternative product if pests are not a problem on the plants treated.
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
Large numbers of spores are produced by the fruiting bodies. The spores are spread by water splash, and will germinate to create new infections if the leaf surfaces stay wet.
The fungi are generally regarded as weak pathogens, and are much more likely to colonise plant tissue that is damaged, dead or that has been weakened by stress factors.
CamelliaCamellia problems: frequently asked questionsCamellia flower blightCamellia gallCamellia yellow mottle virusDisposing of diseased materialScale insectsSooty moulds
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