Spiders on Japanese Maples

Discussion in 'Maples' started by webwolf, Oct 15, 2004.

  1. webwolf

    webwolf Active Member 10 Years

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    Does anyone knows anything about a leaf deformation occuring on *** Maples caused by spiders and how to get rid of it?
    regards
    webwolf
     
  2. Ron B

    Ron B Paragon of Plants 10 Years

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    Further information required: are you asking about plant-sucking mites, or predatory spiders webbing occasional leaves together for shelter?
     
  3. mjh1676

    mjh1676 Active Member Maple Society 10 Years

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    spider mites?

    I have had periodic problems with spider mites if that is what you are referring to. In the case where spider mites are present, there is usually dessication of the leaf tissue and thereby the presence of dried leaves underneath the mite webbing.

    I would not classify this as a deformation per se. Of primary concern is the fact that infestation of this type typically occur on stressed or unhealthy trees. Most healthy trees will resist mite problems, or they will be limited to a very small area.

    Usually they can be treated like aphids and removed with a strong blast from the garden hose, making sure to hit all leaf surfaces. This can be repeated for a few consecutive days.
    __
    Now, if you mean actual spiders, I would likely say no. I have had a spider or two build very densely webbed nests on actively growing branches. The dense web will cause "deformation" by restricting the leaf growth. This is a situation that would be limited to a few leaves and not widespread.

    Did I help, or could you clarify the situation.

    Michael
     
  4. webwolf

    webwolf Active Member 10 Years

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    spiders

    Hi, thanks for the reply. I think, they are webbing spider mites. How do you treat them? I would like to attach a photo but I do not know how to do that.
    Thanks
    Wolfgang

    PS: How come I am listed under 'seedlings'
     
    Last edited: Oct 16, 2004
  5. mr.shep

    mr.shep Well-Known Member 10 Years

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    Hi Webwolf:

    We are all seedlings in these forums until we've made
    enough posts (20 I think) in the UBC forums to graduate
    up to the next level which is Climber. After 100 posts
    are made then we become a Plant Enthusiast. I like this
    format. I was a seedling too at one point back in March.

    Not all discussions on Spider Mites and Mites are restricted
    to just the Maple forum. As we develop a sense of what is
    going on in the various UBC forums we can learn that in a
    few other forums, such as the HortBoard and the Conifer
    forum, that Spider Mites and Mites have been addressed
    in other threads.

    Spider Mites on Japanese Maples is rather rare. I'd like
    to see the pictures of your plant so I can better see the
    damage to the leaves.

    For your problem, it sounds more like a dust mite
    infestation in which a good spider or two has picked
    up on and is killing them for you. We see this sort
    of thing in dry and warm climates. Unless the Maple
    is completely covered with Spider Webs I would not
    spray the tree but I would, like Michael suggested,
    give the tree a good dousing of water and wash some
    of the dust away and off from the plant. A serious
    webbing problem can indeed be problematic for new
    growth as the new and developing leaves can become
    disfigured in shape. If the webbing is too widespread
    to be handled with water then use a low grade insecticide
    such as Malathion and/or Diazinon but use no oil sprays
    on Maples once they have leafed out. Mix the chemical
    with water instead.

    Uploading an image onto the UBC server is pretty
    basic stuff. Just go to the "front door" as I call it and
    look at the Forum Announcements, Info and Feedback
    forum to read up on some of the posts on how to post
    an attachment, in your case an image.

    http://www.botanicalgarden.ubc.ca/forums/index.php?

    Jim
     
  6. webwolf

    webwolf Active Member 10 Years

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    spiders

    Hi,
    I attach a picture to explain the problem.
    A nursery suggested to spray with CONFIDOR (Bayer) act. ingr. IMIDACLOPRID.
    I have not done it jet ( it's raining ).
     

    Attached Files:

  7. When you open up the rolled portions of the leaves, are there spiders inside? They may be rolling up the leaves for temporary shelter, or they may just happen to be sitting nearby. In the photo I might be seeing some chewing, suggested a leaf-rolling caterpillar is on the scene.
     
  8. webwolf

    webwolf Active Member 10 Years

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    It might not be spiders

    Hi,
    I am still puzzled what causes the leaf deformation on all my maples. I attach a picture of my Kasagiama. May be someone has an idea.
    regards
    Webwolf from Downunder
     

    Attached Files:

  9. Ron B

    Ron B Paragon of Plants 10 Years

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    Might be something the climate did when these more recent leaves were unfolding.
     

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