Whilst out walking today I came across a Guelder Rose, Viburnum opulus. Noticing some yellowing of the leaves I flipped one over and noticed a greyish fuzz. I brought it home and under the dissecting microscope it appears to be downy mildew like in appearance and a portion under the compound microscope shows branched, what I assume to be sporangiophores but I can find no evidence of sporangia. On checking the ecoflora website, I cannot find a downy mildew associated with V. opulus.
Am I missing something obvious?
Downy mildew on Guelder Rose
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Simon Horsnall
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Chris Yeates
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Re: Downy mildew on Guelder Rose
Hi
impossible to comment without any images I'm afraid. Are the hyphae septate?
Chris
impossible to comment without any images I'm afraid. Are the hyphae septate?
Chris
"You must know it's right, the spore is on the wind tonight"
Steely Dan - "Rose Darling"
Steely Dan - "Rose Darling"
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Simon Horsnall
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Re: Downy mildew on Guelder Rose
Thanks Chris. I've passed it on to a mycologist to have a look at. I will update when I get a response.
Simon
Simon