Link: my-marijuana-plants-have-bugs-what-do-i-do
I know that this was written and later updated some time ago but things have changed drastically since then and I would hate for someone to happen upon that column and use the information. I think an additional update is in order.
There are lots of good tips in this link: Pest control for cannabis growing without chemicals for example. They are spot on in my experience but maybe some others have better ideas.