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Viburnam collapsed with spongy wood - seeking possible cause
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Jeff Layman wrote: On 04/10/2020 10:22, Nick Maclaren wrote: In article , Jon Nicoll wrote: I'm trying to determine why our viburnam has died, in somewhat spectacular fashion The symptoms are wildly unlike either honey fungus or phytophthora, and the Web and media do us no service by banging on about those. I am afraid a comment the OP made - and I missed at first reading - /does/ suggest Phytophthora. He stated "There are deep cracks running up one or two the trunks". But phytophthora attacks only living tissue, and spongy heartwood is an almost certain indicator of fungal attack. The vigorous shoot also argues against phytophthora, because that generally kills first and subsequent fungal attack destroys the dead plant. Verticillium and other fungi can also cause deep cracks in bark, incidentally. I have a Cotinus coggryia with all of its stems down to the heartwood for half their circumference, and it has been like that for many years (it's Verticillium). Regards, Nick Maclaren. |
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