Iāve been battling with my Dieffenbachia since I brought it inside last fall. Iāve had to trim a lot of it because of yellowing/dying leaves. I wasnāt sure what the problem was but I just noticed these āYā shaped white things on the underside of some leaves. Iāve researched but nothing I see looks like what I have. Iāve dealt with mealy bugs on other plants and these donāt look like that. Has anyone ever had this before? I just sprayed it down with neem oil hoping it will help.