Dampening off has been an issue for me here with non-Mexican landrace strains. I never had that problem in California where I grew mostly Mexican bag weed plants. The Mexican landraces seem to be immune to PM as well, which is a new world plant disease. I soak my seeds in pure 3% peroxide for a few hours and I put a few drops in the water that I add to folded paper towels which I germinate seeds in. I also spray the seedlings for several weeks with the 1 cup per gallon peroxide solution once every other day after putting them in soil to prevent damp off. I tested that on a tray of 120 seedlings a few years ago as a test, and 100% of them survived. I also add some agricultural soap at a rate of 1/2 tsp per gallon as a wetting agent which helps keep the spray from beading up (due to hydrogen bonding in water). Damp off is only an issue for young plants and more typically later season in spring when it gets warmer here. Mature plants become immune to that after they have their 3rd set of true leaves (or about 4 inches tall). For mature plants with PM I use 70% refined neem oil at a rate of 1:100 (3 TB + 2 tsp per gallon of water, no ag soap needed, as it has a spreader in it). You can also use the peroxide spray with ag soap for that, up to 2 cups per gallon of water for bad cases on mature plants. I have found that if I keep my Colombians and SE Asian strains until fully mature, I need to spray them regularly in late season under the lights (December) to prevent PM and mold. But its a hard battle at that stage. The advantage of peroxide is that it just turns to water when it breaks down, so there is no residual taste or smell left on buds spraying late season or before harvesting. The peroxide spray also helps with bugs like mites and aphids as a contact spray. And it is non-toxic to most beneficials, your pets, kids, and you.