That bug is a root aphid, it's bad news you need to look it up and find how to treat them asap!
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If
@Seraphine is around she can tell you everything you need to know about any insect!
re: that white stuff on the leaf, I think it's white powdery mildew!?
You might want to spray the white powdery mildew (wpm) with one level tablespoon baking soda to 1 gallon of water to stop the spread of that mildew asap? The purpose of baking soda is to raise the pH of the leaf surface to stop the wpm, spray top and bottom of all leaves well
I had a little bout out of wpm a few months back and I still have plants showing damage from it, so recommend getting after it quickly! Best wishes!