in my conditions, and with lots of seedlings and mature plants , I have found the ideal is to spray at least every 14 days with a rotating list of pesticides and then a fungicide. Its a real pain but I bought a one gallon sprayer and that made the job much easier. If you have a lot of houseplants like I do, you also have to consider whether they are home-base to some pests.
I use Sucrashield, Safer Soap, Neem Oil and then Thiomyl. I also use a home-mix of Dr Bronner's/rubbing alcohol/water approx every 3 months. I find spraying the plant containers, mix and stands also helps.
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