yea kill those bastards fast!!!! They clone themselfs and can multiply by the thousands every day and they are fucken hell to get rid of.. I have thrown every freaken chemical treatment including pest strips at them and lost.. untill.. local spiders (the big eight legged kind) found them all on their own, spun webs around my grow area and went to town.. ate the fuck out of the aphids and in a week or two after the spiders showed up no more aphids.. NONE.. but now there are spiders all over my house.. and I hate spiders but for now they are welcome houseguests.