Now THIS is truly FASCINATING:

“Spider mites are a danger to hemp and cannabis crops. Here’s why:

Rapid reproduction – a single mature female spider mite can produce a million mites in less than a month.
Disappearing act – spider mites often appear to be gone/killed, then they come back with a vengeance days or weeks later.
Big appetites – spider mites can eat up hemp plants in a short amount of time; a bad infestation has been known to kill plants overnight.
Webbing – spider mites cover leaves with a fine mesh of silk webbing, ruining whole crops even after you get rid of the spider mites.”