Return to the Japanese Gardens Forum | Post a Follow-Up

Acer Palmatum 'Deshojo' - white powder and nest?

Posted by beemouse none (My Page) on
Tue, Sep 4, 12 at 15:24


I received a largish (about 150cm high Acer Palmatum 'Deshojo' for my birthday this June. It was very full and bushy (maybe a bit too much - I wondered if it should be trimmed in the centre). It was also in an extremely small pot for a tree its size. So I re-potted it into a larger (and heavier, as it can get windy and the tree was blown over several times) pot. This was perhaps a bad thing to do at this time of year? We went away on holidays for the month of August. The person that stayed in our apartment watered the plants regularly. However, the tree is showing three signs of distress:
1. The outer leaves are turning brown, curling up and dying. I have since read that this is most likely due to the fact that it has too much sun exposure and not enough watering at the top of the plant.
2. MANY of the leaves are dropping off, even if they have not browned.
3, and worst. Almost all of the leaves are covered in a white powdery substance that was not there at the end of July. While spraying the leaves this morning with milky water, I noticed a kind of insect nest in two places (see bottom two photos).

How can I treat these problems? Please assure me that my tree is not dying (and that I did not kill it by re-potting mid-summer) ?

Thanks for any advice!!

Follow-Up Postings:

RE: Acer Palmatum 'Deshojo' - white powder and nest?

  • Posted by gerris2 Zone 7a Delaware (My Page) on
    Mon, Jan 14, 13 at 20:31

The white blobs look like mealybugs. The leaf growth, maybe it's a powdery mildew? See page three of the referenced extension publication (see below for link).

Its healthy leaves look awesome!

Here is a link that might be useful: Common Diseases of Maple

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Japanese Gardens Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here