Ck the links below. Pyrethins are bad enough but PBO is terrible. You got a quick fix with the stuff you bought, but long term you have created problems. Find out what is wrong with your plant & address those problems. Search this discussion board & the Dirt Doctor web site for help. For bugs that give you problems beyond garlic/pepper spray, try Neem Oil or one of the new plant derived sprays.
http://www.dirtdoctor.com/forum/viewtopic.php?t=1193&highlight=pyrethins
http://www.dirtdoctor.com/view_question.php?id=350