My mango seedling has some white fuzzy fungus-like spot on one of its leaves. What is it, and what should I do about it?
A quick google search suggests powdery mildew, but I doubt that's it as the pictures don't match 100%. However, it has been very hot and I did let him dry out too much recently (which is said to promote powdery mildew).
PS: this is not the same seedling as in my previous questions 1 & 2.