White things.

[goosander]

I put this on the undercover thread but should possibly put it on here.
Have a lot of white things that look like on top of new compost after potting up a cherry tree. Was wondering if it could be greenfly cases.
Any ideas what it is.
Thanks.
Bob.

[Snoop Puss]

Hi Bob, a photo might help.

[goosander]

Am unable to send photo as I have removed all the effected compost and replaced with fresh.
Bob.