Trichoderma harzianum, Bacillus subtillis.
These are microbes that control harmful fungus. Combination of these is more effective than when use alone.
I use microbes because I don't like to smoke chemecals that are left over on the buds. Microbes does not last too long and it has to be sprayed more often.
And some strains have weak resistance that would rot in high humidity no matter what you do.
I grow out door in Thailand where it is hot and wet. During wet season I still can collect some buds with these microbes. Not the best possible buds but still better than nothing.
Good luck.