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bugs on my japanese maple tree #745088

Asked April 19, 2021, 12:05 PM EDT

Dear Extension, We just planted a new Japanese maple tree (about 6-7 feet tall) this past fall (Nov. 2020) in our front yard in Rockville, MD. When the buds emerged on the tree in early March, there were little black bugs all over every single leaf bud; I don't have any pictures of those but they were about the size of a sesame seed and didn't have wings from what I could tell; they had legs but I didn't count them. They didn't look like spider mites though. I left them alone. When the leaves emerged a few weeks ago, I couldn't see the black bugs anymore so I thought everything was ok. About a week or two later, I noticed what you see in the attached pictures on all of the leaves, both the top and bottom sides of the leaves. They look like little golden brown 'bugs' with what look like legs but they don't move and don't squish. They are also easy to remove from the leaf and there isn't any damage on the leaf underneath the 'bugs' if you remove them. However, there are too many of them on every leaf so I can't systematically go around the tree and remove them all. I'm just wondering if you know what this is and if I need to be worried about it. I just don't want my new Japanese maple tree to die! Thank you for your advice!

Montgomery County Maryland

Expert Response

Sounds like you had a typical early spring flush of aphids, a common type of sucking insect. The population of aphids builds rapidly in spring until their predators have a chance to catch up--and eat them or parasitize them: https://extension.umd.edu/resource/aphids-trees-and-shrubs

It's a classic spring scenario and the fact that your beneficial insects wiped out the aphids means you have a healthy insect population.  Avoiding insecticide sprays allows that to happen. 

The brown "bugs" you see sound like "mummies". An aphid mummy is like the shell of the aphid that is left after they are parasitized. Yikes. It is discussed in the link above under "Management" > Biological. 

Ellen  

Ellen Replied April 19, 2021, 12:27 PM EDT
Dear Ellen,

Thank you so much for your quick reply! This makes me feel a lot better knowing my tree isn't at risk! I also like the idea of not having to resort to spraying my tree with insecticides; it's good to know that we have a healthy insect population with its inherent checks and balances. 

I really appreciate the help and advice, thank you!!

-Leia-

On Mon, Apr 19, 2021, 12:27 PM Ask Extension <<personal data hidden>> wrote:
The Question Asker Replied April 19, 2021, 12:49 PM EDT

You are most welcome.

Ellen Replied April 19, 2021, 1:09 PM EDT

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