Lithocarpus cleistocarpus - why all these dead leaves?

Discussion in 'Talk about UBC Botanical Garden' started by wcutler, May 22, 2021.

  1. wcutler

    wcutler Paragon of Plants Forums Moderator VCBF Cherry Scout 10 Years

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    I'm having trouble figuring out what I'm looking at here on the Lithocarpus cleistocarpus. I didn't seem to take a photo of the whole tree, but it's entirely covered with dead-looking terminal clusters of leaves. And these leaves looks different from the older leaves, with prickles on the leaf underside midrib and I think the twigs, which do not occur on the adult leaves in my photos,
    Lithocarpus-ccleistocarpus_UBCBG_Cutler_20210519_140832.jpg Lithocarpus-ccleistocarpus_UBCBG_Cutler_20210519_140858.jpg Lithocarpus-ccleistocarpus_UBCBG_Cutler_20210519_140938.jpg
    and I don't see prickles on my photos from July 2012:
    20120711_UBCBG_LithocarpusCleistocarpus_Cutler_P1260724.JPG 20120711_UBCBG_LithocarpusCleistocarpus_Cutler_P1260725.JPG 20120711_UBCBG_LithocarpusCleistocarpus_Cutler_P1260728.JPG
    or last July.
    Lithocarpus-cleistocarpus_UBCBG-3ACA_Cutler_20200702_132916.jpg

    There are new leaves coming on branches that do not have these leaves:
    Lithocarpus-ccleistocarpus_UBCBG_Cutler_20210519_140844.jpg Lithocarpus-ccleistocarpus_UBCBG_Cutler_20210519_141010.jpg

    Did something happen last year that caused all the new leaves to die off? I don't think I'm being fooled by some unrelated vine - the first photo shows the dead-looking area growing right off the end of a branch of green leaves.
     
  2. Sulev

    Sulev Contributor

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    Looks like a late frost has killed these outer shoots / shoot tips.
     
  3. Eric La Fountaine

    Eric La Fountaine Contributor Forums Moderator 10 Years

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    Yes, looks like the newly emerging leaves are damaged. Considering our weather, maybe drought stress. The ground has been very dry at times for a plant with newly emerging leaves. The prickles may become more pronounced as the leaf dries, just a guess.
     
  4. wcutler

    wcutler Paragon of Plants Forums Moderator VCBF Cherry Scout 10 Years

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    This Lithocarpus cleistocarpus didn't look so bad today. The new leaves have opened. The old leaves are so beautiful with the dark tops and light undersides.
    Lithocarpus cleistocarpus_UBCBG_Cutler_20210624_132417.jpg Lithocarpus cleistocarpus_UBCBG_Cutler_20210624_132434.jpg Lithocarpus cleistocarpus_UBCBG_Cutler_20210624_132505.jpg
    Lithocarpus cleistocarpus_UBCBG_Cutler_20210624_132441.jpg
     

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