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Fragile Ginkgo tree



  • DovefromaboveDovefromabove Posts: 86,925
    I’m just unsure of the wisdom of seeking authoritative horticultural advice on trees from rather than the Forestry Comission 😕

    Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.

  • [Glen][Glen] Posts: 76
    It is raining today..

    Above: Brown edges emerging on random leaves. I am learning the behaviour of Ginkgo's, but from what I have observed, any leaf that starts dying will continue to die on its branch without dropping.

    Above: This branch sustained wind damage by colliding with the fig underneath. The Compared to Figs the Ginkgo's bark is fragile. Leaves adjacent to the damage quickly died before the summer heatwave began. That leaf death spread up to the tip of the branch. The photo shows leaf death now spreading down the branch.

    You cannot see the Olive in this picture. It showed some dieback earlier in the year but now appears to have fully recovered and is fruiting, so I think the Olive is not diseased.

    Background: Unlike the Ginkgo, the two Acer's (out-of-focus) are in the ground. The tiny red one is doing badly but there are mitigating circumstances because it was scorched in the heatwave, and it was 50p last year after being refrigerated by a supermarket!
  • pansyfacepansyface Posts: 22,698
    edited August 2018
    Hello glen. Please excuse our ill manners. We are normally a placid bunch.

    Your Gingko leaves are showing some marginal necrosis (not my being a show off with words, it’s what the original link I sent says about signs of Xylella fastidiosa infection), though marginal necrosis can be caused by lots of things. You say that the leaves don’t drop off after they die. This is also a symptom of X fastidiosa (see the link again).

    It may not be a serious disease that your tree has. But why take the chance?

    The Forestry Commission have offered a service to the public. They have provided an online form for the public to send in. And they are the experts. I am certain that they would be more than happy to tell you not to worry and also more than happy to be alerted to any disease should it turn out to be the case.

    I recommend you attach your photos to their tree alert form, send it in and let us know the outcome. 

    When you hear back we shall all be interested to learn more about Gingko trees and their problems so that we can help others in the future.

    Apophthegm -  a big word for a small thought.
    If you live in Derbyshire, as I do.
  • [Glen][Glen] Posts: 76
    edited August 2018

    Ginkgo trees are very resistant to any type of disease or insects. They have lasted for centuries because of this hardiness.

    I would be cautious about assuming cause and effect because surviving undisturbed in virgin enclaves does not make a species hardy. Until recently G. Biloba's native habitat in China was not exposed to the threat of industrialisation. The IUCN now classifies the last extant Ginkgophyte as "Threatened"; its hundreds or thousands of cousins were not hardy enough to make this this far. 

  • ObelixxObelixx Posts: 29,839
    If tree bark is damaged enough the cambium layer just below suffers and that will lead to damage to foliage and growth as it is the cambium layer that transmits sap and makes the growth ring every year.   That may explain the damage to the gingko.  It remains to be seen whether it is permanent or whether it can recover.

    The olive tree is another matter.  How long have you had it?  Where did you buy it?  Do you know if it was quarantined and tested before being sold?   Xylella is a serious problem that needs to be contained asap.  How much time and effort will it really need for you to contact the appropriate people and get a diagnosis one way or the other?  You would gain peace of mind if it's not Xylella and may save a great deal of harm if it is.

    As for your acers, they are woodland glade plants tho some, such as Sango Kaku, do well in full sun if the soil is moist enough and they are sheltered from strong winds.  Give them plenty to drink and they may recover.

    Vendée - 20kms from Atlantic coast.
    "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
  • [Glen][Glen] Posts: 76
    edited August 2018
    Obelixx said:
    The olive tree is another matter.  How long have you had it?  Where did you buy it?  Do you know if it was quarantined and tested before being sold?
    Might have bought & potted both Ginkgo & Olive circa March this year from a GC that has been around for 20 years and has a few outlets.

    I know next to nothing about forestry and horticulture professions, but the GC that sold this tree advertises that the manager is RHS qualified. That might say more about the other staff than it does about the manager.
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