Fungus gnats and spider mites are annoying, but on an auto you cannot afford a two week treatment cycle that stalls growth during the stretch. I go with prevention only, sticky traps from day one, a layer of sand on the soil, and a neem soak of the medium before planting. Which treatments are safe on autos in flower and which will ruin the taste are ranked on https://turboautoflowerseeds.com by stage of growth. Spraying anything on buds after week five is a bad idea.