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Danger in Delay?
Viburnum X bodnantense 'Dawn' blooms from the end of October to March with a short break, and fills my garden with scent in november (if is is mild) when you never expect it. The last few years I always noticed in spring, when the first leaves appear, branches dying off. I thought it is Monilia (blossom blight), which also occurred regularly at my 'Prunus triloba' , where I always used to cut the branches off to keep the fungus under control.
So we decided to do so again this morning with Viburnum and ended up cutting all branches completly as they were all infected.
But is it really Monilia? Googling about, I read about another fungal infection which is called 'Phytophtora ramorum'. And as our garden is situated next to a stream in a sort of valley, the air is always humid and fungi-prone ( tomatoes get 'Phytophtora infestans' , roses 'Diplocarpon rosae').I wonder if this dangerous fungus has found its way to our garden, too. I was reading about this disease causing oak trees to die back in California, and also that it is highly infective which makes it necessary to destroy the shrub completly to prevent a further infection of other plants.
Herumgoogeln ergab dann, dass Viburnum zu den Pflanzen gehört, die von einem weiteren Pilz betroffen sein können, nämlich 'Phytophtora ramorum', der in Deutschland seit Mitte der 1990iger Jahre zu Schäden führt, eben vorrangig an Viburnum und auch an Gärtners geliebtem 'Rhododendron'.Allerdings wurde für die typischen Schadsymptome dann erst 2001 Phytophtora ramorum als Erreger sicher festgestellt! In Nordamerika wütet er wohl schon länger , wo ganze Eichenwälder davon betroffen sind und dort zum Absterben führen. Wenn es denn diese Pilzkrankheit sein sollte, muss ich mich wohl oder übel von meinem Viburnum trennen, um ein weiteres Ausbreiten dieser Krankheit zu verhindern.