My Kay Parris Magnolia has some odd white spots on it. I’m wondering what these could be and how to deal with them?
I see two things here:
some of the spots look like they do not come off. Likely a bacterial infection
there are clusters of insects and webbing that might be whitefly
If the tree is in good health it will tolerate both these. An inspection of drainage, soil moisture any other stress factors would be a good idea.
A picture of the whole tree would be helpful too.