Help?!! White flies in week 4 of flowering.

i tried searching for a little while and couldnt find anything on white flies, also im in week 4 so almost done buding and they are destroying what little fan leaves i still have, and they are starting to get on the buds. please anyhelp on how to kill these things is really appreciated. how to be bug free for the harvest.

Wait for more knowledgable answers but I read on several other plant related forums that putting down a thick layer of earth worm casings around the base of the plant and lightly churning it into the soil a lil keeps them at bay. But I have never had to do this.

http://www.beantogreen.com/blog/?p=73

Marigolds too... I keep them in my veggy garden. No pests.

Lotsa sticky traps too.