Can fungus gnats be killed by freezing
I had a few pots of cuttings and seedlings that were infested with fungus gnats. The plants have been removed but I was wondering if the gnats could be killed by freezing temps? I stuck the pots outside and our temps are below freezing. If I leave the pots out for a few days could I reuse the soil or just forget about it? I usually use Bt or peroxide to fight the gnats but it didn't solve the problem in a few of the containers.