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Tree covered in small black insects

I live in Sweden and have a Japanese maple tree in a pot on my balcony. This October I saw maybe hundreds of small insects on my tree which I believe caused the leaves to crumble and fall. Which to me indicates that these insects are draining my tree of nutrition.

I have searched for days for an answer. The insects look different to each other. What is this?

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  • Thanks for posting this. To identify the insects we need a closeup picture. Is there any sticky sap on the branches or ground near it?
    – kevinskio
    Commented Oct 14, 2021 at 14:56
  • Hello, thanks for the answer. I can't upload any images. Is it a problem on the website?
    – Thea
    Commented Oct 26, 2021 at 13:25
  • IMG_1356.PNG testing
    – Thea
    Commented Oct 26, 2021 at 13:26
  • the picture is too big: maximum size of 2 Mb. change the resolution on your camera or use paint to resize
    – kevinskio
    Commented Oct 26, 2021 at 15:51

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