Fortunately, living in the desert seems to make fungus gnats less of a problem for me, but when I lived in more humid climates, I had good success with Bacillus thuringiensis isrealensis. It doesn’t kill on contact and takes a few weeks to work, but it does work.
I’ve never had a problem with new potting soil being infected, but I’m sure it happens. I make sure there are no tears in the bag when I buy it, and after I’ve opened the bag, I twist the top closed and secure it with a rubber band. I actually do this so I don’t spill soil all over the place when I move the bags (I’m a klutz), but it probably keeps bugs out too.
Fortunately, living in the desert seems to make fungus gnats less of a problem for me, but when I lived in more humid climates, I had good success with Bacillus thuringiensis isrealensis. It doesn’t kill on contact and takes a few weeks to work, but it does work.
I’ve never had a problem with new potting soil being infected, but I’m sure it happens. I make sure there are no tears in the bag when I buy it, and after I’ve opened the bag, I twist the top closed and secure it with a rubber band. I actually do this so I don’t spill soil all over the place when I move the bags (I’m a klutz), but it probably keeps bugs out too.