Chinese Elm Disease

[AboveBeyond]

My ground planted elms have some serious issue with this disease. It's worsening becuase it's spreading throughout the tree. What is it and how do I treat it? Thanks!

 

[Kodama16]

I'm going to let some one else chime in on this cause I truly don't know. But normaly leaves like that make me think fungal.

 

[Smoke]

They are mealy bug larva. Just pick all the infected leaves off the tree and spray for bugs like anything with pyrethrins in the spray. I get these once and a while. They do no long lasting damage but if you don't get them off they will defoliate a whole tree as they spread like tomato worms. Put the infected leaves in a plastic bag and tie a knot in it to dispose.

 

[Smoke]

This is the first year I have ever had these critters. Look inside at the small larva in there. A magnifying glass may be needed. You can watch them damn things moving all around inside their leaf rolled cocoon.

 

[AboveBeyond]

They are mealy bug larva. Just pick all the infected leaves off the tree and spray for bugs like anything with pyrethrins in the spray. I get these once and a while. They do no long lasting damage but if you don't get them off they will defoliate a whole tree as they spread like tomato worms. Put the infected leaves in a plastic bag and tie a knot in it to dispose.

Thanks Al. The two elms infected are 9 ft high so there's quite a lot of leaves to remove. I'll get as much as I can.

 

[Kodama16]

Thanks smoke. Adding this one to the books.