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Viburnam collapsed with spongy wood - seeking possible cause
On Sunday, October 4, 2020 at 1:29:26 PM UTC+1, 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. (Nick) Thanks for the thoughts, but I'm puzzled about your Bracket Fungus idea. - I can't see any Bracket Fungus (possibility of one tiny bit). The object I am calling a 'gall' is not a fungus, I am pretty sure. It's quite woody - From my readig, Bracket fungus lives on dying wood, but doesn't cause the dying. Can you explain a bit more? Thanks 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". I'm not sure how similar the cracks in your photo are to those on my Viburnam. Unfortunately I can't take any more photos, I've got rid of the tree. Phytophthora was my initial best guess as well, but would it cause the large- scale sponginess of the tree and roots I am seeing? J^n In June last year I had a Grevillea rosmarinifolia die within two weeks. It had been in the ground for six years and had been growing very well, being about 150 cm high and across. It appeared to die by drying out, as the flowers and even some of the leaves were shrivelled. Remember that this is a plant from SE Australia, well used to very hot and dry conditions. (One I had previously growing at another garden shrugged off the extreme heat of the "noughties" and grew to 350 x 350 cm. It was still growing well when we moved.) The plant I had which died showed one particular condition which puzzled me, and that was deep longitudinal cracks along its trunks: https://ibb.co/TH9Nfnh When I asked about this with someone I know at the Royal Botanic Gardens, Sydney, he replied: "... in an Australian context I would put this down to attack by a root pathogen, and in this country the most likely culprit would be Phytophthora cinnamomi... In the UK context it could be a different pathogen of course, but the suddenness of attack and the stem split is reminiscent of ‘Pc’ as it is often called here. Basically the pathogen, the spores of which are borne in water and soil, infects the roots (often at times when the plant is under stress from other causes) and blocks the water-conducting tissues of the roots, leading to sudden dehydration, sudden wilting/browning of foliage, and (sometimes) stem splits as the tissues are denied water" -- Jeff |
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