i hear spot treating with low dose peroxide works well. also the use of a sulphor burner before flowering. there as also a number of other GPP things that indoor growers could look at. As an organic outdoor grower I'd be looking at the soil for too much nutrient. Too much nutrients can create these issues, disbalancing the plant. you might look to get a sap test done.
Ive seen alot of people use UV,they even make handheld lights specifically for that use,its called cleanlight or something like that.
Another thing im seeing is people supplementing with the solacure bulbs to boost UV and as a side effect they are saying no PM and drastically reduced pest problems in the rooms with these bulbs,these are not little guys either so they have alot to lose.