Return to the Garden Clinic Forum | Post a Follow-Up

 o
white powdery oval (worm shaped) on back of leaves

Posted by gardenaire 8a Vancouver BC (My Page) on
Sun, Jul 28, 13 at 21:03

I have a shrub in the yard that has masses of white fuzzy (powdery) shapes on the back of the leaves. I suspect there may be a bug under the fuzz but haven't seen one yet. When I rub the leaf the white shape rubs off like powder.
As well, and I'm not sure if it is connected....there is a black residue/mold? on the tops of the leaves. I've done a ton of google searches and image searches and have found nothing that matches.
Does anyone know what this might be and how to deal with it?
Many thanks!! Deanne


Follow-Up Postings:

 o
RE: white powdery oval (worm shaped) on back of leaves

Looks like wooly scale


 o
RE: white powdery oval (worm shaped) on back of leaves

This is cottony scale, a plant sucking plant pest.
The white stuff are egg sacs, each one filled with many tiny eggs.
The scale insect is probably dead by now -- it's the small tan thing at one end of the egg sac.

The black stuff is sooty mold. It's an everpresent fungus which colonizes the sticky stuff the scale insects excrete while they are feeding.

Direct hits of insecticidal soap can help limit the scale insects and help loosen the sooty mold so that you can wash it off with a forceful water spray.


 o
RE: white powdery oval (worm shaped) on back of leaves

Thank you ians_gardener and jean001a! I appreciate your time. I checked both insects online images and we definitely have the cottony scale. I will apply the insecticidal soap and hope for the best.


 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 Garden Clinic 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.
  • 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