Welcome to ArboristSite.com! Log in or Sign up to interact with the ArboristSite community.

ArboristSite.com Sponsors
 
 


  1. Please see this post Click Here Please ask questions if you have them!! I hope this is going to be great for us all.
    Dismiss Notice

Oak deaths due to excessive light at night?

Discussion in 'Plant Health' started by MzHopsing, Mar 7, 2018.

  1. MzHopsing

    MzHopsing ArboristSite Member

    Joined:
    May 15, 2008
    Messages:
    60
    Likes Received:
    15
    Location:
    Central IL
    Hi all - I recently finished a fantastic book (The Hidden Life of Trees - Wohlleben) that was packed with tons of mostly footnoted facts, a bunch of which I was unaware. One explained about how trees need to rest at night like people, and how city light affects seasonal dormancy and tree health. He mentioned an American city (Wohlleben is a forester in Germany/central Europe) whose oaks were suffering, and that 4% of them had died because they were subjected to light every night. Unfortunately, this info was part of a 1981 report in a German journal called Gartenamt, and my online search to discover where this happened, and if they remedied the problem in time, has been fruitless. I figure if it made it to a German publication, surely it had to be in one on this continent...?

    I know solving this is a long shot, but I know some of you guys have been doing this awhile, so thought I'd throw this out there. Any arborist/environmental entities that might include this story that you might know of?
     
  2. ATH

    ATH Addicted to ArboristSite

    Joined:
    Nov 18, 2006
    Messages:
    3,238
    Likes Received:
    1,877
    Location:
    Ohio
    Searched Journal of Arboriculture archives...found an article from October 1975 "Security Lighting and its Impact on the Landscape". It lists the oaks as having "low" sensitivity to the lights... But location and intensity of the lights will be a huge factor in whether or not there is even a chance of impact.
     
    MzHopsing likes this.
  3. MzHopsing

    MzHopsing ArboristSite Member

    Joined:
    May 15, 2008
    Messages:
    60
    Likes Received:
    15
    Location:
    Central IL
    Oh wow, I knew it had to be a ways back, but you found it! Thanks ATH!! Does it talk about the deaths of the trees or where it happened? I have so many questions...
     
  4. ATH

    ATH Addicted to ArboristSite

    Joined:
    Nov 18, 2006
    Messages:
    3,238
    Likes Received:
    1,877
    Location:
    Ohio
    MzHopsing likes this.
  5. jomoco

    jomoco Tree Freak

    Joined:
    Oct 4, 2006
    Messages:
    14,238
    Likes Received:
    3,124
    Location:
    San Diego CA
    Just finished Wollebenn's book myself.

    Probably the best book I've read on trees to date, easily the most fascinating, with an emphasis on how little we know about them, compared to how much we've yet to learn.

    I had high hopes he'd do a chapter on Ghost Redwood's, however he did explain how root grafting between related species can and does allow a tree with zero chlorophyll to survive among friends n family.

    https://www.mercurynews.com/2016/09...ystery-of-ghosts-of-the-forest-may-be-solved/

    Jomoco
     
    MzHopsing likes this.
  6. MzHopsing

    MzHopsing ArboristSite Member

    Joined:
    May 15, 2008
    Messages:
    60
    Likes Received:
    15
    Location:
    Central IL
    Thanks so much ATH!! When I did a prelim search yesterday I read that there were only full articles for 2002 and on, so I didn't even go any farther. This is far more than I hoped for! I'm not an arborist, just an enthusiast, so not sure they'd accept an app from me....:(

    Again, much thanks for digging this up! You rock! :numberone:

    EDIT to add: I just read through that article on security lighting impacts, and there's no mention of the town or deaths of trees, so it's possible it's in one of the 'sources of additional information' listed at the end. There's one called 'Dormancy of trees in winter' that looks hopeful, so I'll dig for a bit longer...
     

Share This Page