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Japanese maple disease identification. Please help b

Discussion in 'Plant Health' started by mbsfield, Nov 14, 2016.

  1. mbsfield

    mbsfield ArboristSite Lurker

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    Can anyone identify what this issue might be?

    [​IMG][​IMG]

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  2. redlawn 78

    redlawn 78 ArboristSite Lurker

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    That looks like scale insect. I've always used horticultural oil for scale, but it can be tough to eradicate. generally infestations happen due to stress on the plant. is this a new planting? if not new, has anything changed around the tree? like building a new structure or removal of a structure (like a fence/shed or paving, etc.
     
  3. mbsfield

    mbsfield ArboristSite Lurker

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  4. redlawn 78

    redlawn 78 ArboristSite Lurker

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    After looking at the pics again, have all the ties to the support stakes been loosened or removed? (Including name labels). that can lead to problems as well.
     
  5. mbsfield

    mbsfield ArboristSite Lurker

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    No, this tree is 4 years old and has been in this pot for around a year now. The only thing that's changed is the season. The top canopy is somewhat spotted. I couldn't identify as to why though.

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  6. mbsfield

    mbsfield ArboristSite Lurker

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    Yes, all of those have been removed. On the other hand, I did add some ivy and some firebud flowers to the pot in the spring. The firebuds tag is still in there. I poured a cup of coffee grinds into the pot last week. Although, it does look like there is a tie on the tree in this pic, I'll look again.


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  7. redlawn 78

    redlawn 78 ArboristSite Lurker

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    If you Google 'scale on Japanese maple' it will show pics that are much like your tree issue. if the tree is in a pot it sound like it may easy enough to eliminate a major portion by hand. you should be able to wipe them off on most of the stems using your hands. in tighter areas like narrow crotches i would recommend using a horticultural oil mixed for summer use,, spraying weekly and first thing in the morning, until the tree has gone dormant. then change to a winter mix.
     
  8. mbsfield

    mbsfield ArboristSite Lurker

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    I touched one yesterday and it did seem to wipe off easily. I will do that. These pictures are actually pretty clear, so I'm not sure why the post isn't. The little scales look like Hershey kisses and one looks like a bonnet or shower cap(just for clarification since the pic is blurry). I will remember to look that up once I get home.

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  9. redlawn 78

    redlawn 78 ArboristSite Lurker

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  10. redlawn 78

    redlawn 78 ArboristSite Lurker

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    The pics were good.... and the post was clear. I was just asking about stresses to see if there was a reason the maple became infested. sometimes it just happens, and sometimes there is something else that causes the plant to be more susceptible.
    After hand cleaning I would definitely follow up with an oil spray. and your local nursery should be able to recommend a brand for you. just make sure it is for summer and winter use and it should be 100% Parafinnic oil.
     
  11. mbsfield

    mbsfield ArboristSite Lurker

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    Thank you for the help, it's greatly appreciated. There probably is some stress though. The leafs were beautiful until last month. The pot may have become too dry while I was out of town, it seems like the leafs took a hit after that. At first I thought the sun was too intense, but my parents trees are fine (and they see much more direct sun than mine). Other than than, I'm not exactly sure what might be stressing the tree.

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  12. Jed1124

    Jed1124 Addicted to ArboristSite

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    My first thought is cottany maple scale.
     
  13. mbsfield

    mbsfield ArboristSite Lurker

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    I could see why that would cross your mind. After a review of the scale, it definitely is not that. These seem squishy and wet. There were some images that looked similar, though.

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  14. redlawn 78

    redlawn 78 ArboristSite Lurker

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    ruling out scale leaves only mealy bugs.
    I would use the same treatment already recommended.
    as for the spots on the leaves.... Without seeing a pic I can't say with total certainty if anything needs to be addressed.
     
  15. mbsfield

    mbsfield ArboristSite Lurker

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    I think it's still scale, just not cottony. These don't appear to be mealy bugs either, could be a different for I suppose.

    [​IMG]



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  16. mbsfield

    mbsfield ArboristSite Lurker

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    The strange thing is, I just knocked them off and there was zero damage at the attachment site.

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  17. redlawn 78

    redlawn 78 ArboristSite Lurker

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    You mentioned
    That has me leaning more towards mealy bugs. both scale and mealy bug are sap sucking insectso rather than chewing like slugs or caterpillars, so damage is not immediately apparent. it generally shows as distorted new growth.

    With a little better view of the leaves, i am thinking that is stippling i am seeing on them. that could be spider mites, which are very very tiny sap sucking insects.

    What part of the country is this and is the dtree kept outside and exposed to the elements?
    the fact that the tree hasnt started into domancy im guessing you are maybe inland southern california... or near anyways.
     
  18. mbsfield

    mbsfield ArboristSite Lurker

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    I'm perplexed by my this as a whole. No, I'm actually in mid Alabama. The weather is oddly hot for this time of year.

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  19. redlawn 78

    redlawn 78 ArboristSite Lurker

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    Hort oil is acceptable to use for treatment of both issues. if you are still wanting a definitive i.d. take a stem to a local nursery.
     
  20. Jason Douglas

    Jason Douglas ArboristSite Operative

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    Put on a glove. Remove the bugs. Done.

    If they come back use oil or insecticide next year.
     

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