You need to remove it if you have any hope. I would chop it if it were me.
Take some 3 or 5% hydrogen peroxide, add a tbsp per gallon. Water just a little bit, just enough to soak the mildew and the top portion of the soil. The hydrogen peroxide will kill the mold. After application wait a little bit, and remove the mold as best you can. Be very careful. You do NOT want to agitate it, as any still-living spores will become airborne and can latch to your plant, or elsewhere in your growroom. You want to kill it and have it be gone for good. Remove the top inch of soil, or however much accordingly to how much mold there was. You want to at least remove to where the mold could have grown into the soil and a little beyond that. Trash it, top with new soil, hope for the best.
FWIW - unless you are SURE you have a bug problem, its ALWAYS best to NOT treat for bugs. Pesticides are made with chemicals specifically made to either attract and kill or bother the bugs. At any rate, it is designed for the bugs usually with pheremones - so if you dont have them now, adding a pesticide just increases the likelihood of them coming around. And in your case, using some weird organic pesticide hurt your plants.