I have used Bonide with great results. It is organic, Neem oil and water based. If the outbreak is not too bad run it on a 14 day cycle, but once every 7 days works fine. What size fan are you running? And at what speed? I found that as long as my ladies can handle it, I run my circulation fan pretty high. It keeps the spores from setlling and will also keep the pests from being able to hang out and cause damage. Not to mention it gives the plants a great workout.