i was using miracle grow "seed starting" mix, then i transplanted into the standard potting mix. Because of the lack of soil(due to my tight budget) i had to mixx the two soils for one of the plants. This is where i took in potting soil from outside(mistake), which would explain spider mites.

I have since given the plant a flush and the problem didnt spread, but i was just wondering if it was a disease or something.

Speaking of disease, i have come into possession of a clone yesterday, that has a powdery white mildew on it. How should i treat this properly?