aphids on maple tree

Asked May 22, 2017, 11:13 AM EDT

Attached are a few pictures of what I think are aphids on a maple tree. A county resident brought the sample into the Antrim County Extension office Can you help to confirm this or let me know what it is if I'm wrong. the client is only seeing the aphids on the live branches.

Antrim County Michigan trees and shrubs scale insects

1 Response

Hello,

These large bumps on the stems are mature scale insects. If you see any tiny moving insects they are likely the 'babies' of these, called crawlers. There are several kinds that can be found on maples. This one looks like lecanium scale.

Depending on the size of the tree, the client could treat a small tree (under 15 ft) himself or for large trees hire an arborist. Remeber to always read and follow all label instructions for any chemical.

Here is some information on how to control these insects. Timing is important. If this client lives where wide spraying for mosquitoes is done, that spray kills some of the natural controls for scale, and scale becomes a large problem. So, chemically treating the tree is an option rather than waiting for natural predators to control it.


https://www.extension.umn.edu/garden/insects/find/scales/soft-scales-deciduous/index.html

http://msue.anr.msu.edu/news/treatments_for_calico_scale_cottony_maple_scale_and_lecanium_spp_scales

To find certified arborists in your zip code search here-

www.treesaregood.org

I hope this helps your client. Thank you.