@Khakibos, at 1st I sprayed until the ladybug population started getting bigger. Once I saw a permanent ladybug presence I stopped spraying anything.
If I have to spray then I spray with Lactobacillus Serum which sorts out a lot of things. I had PM in the beginning but a couple treatments of water, peroxide and baking soda sorted it out very quickly
Right now I'm focussing on getting them big as possible before they start to flower (switching lights off of 31 December) so that the harvest will be plenty.