Old thread but i must say this stuff is magical. I had PM attack a multi strain crop. I noticed my blueberry kush and trainwreck are super resistant and never get while all other strains will share those dots. I bought sulfur burner and did that til week 4 flower then it started coming back by week 6 so i had maintain it daily til harvest to save plants.
Next set i treated with sns244 prior to sulfur and used sns244 out to week 2 flower with no ill effects. Sulfur til week 3 that time and pm never returned on any strains.
Now i use this systemmic powder with bacculis or sumn in it that u do rootsoak and helps plant resist ever gettn it. With all three methods in use, only using sns244 in flower if needed... No more PM period and its rainy as hell outside here in oregon. Very high humidity for weeks... Its late december now. I think a dehumidifier is wise choice too! But dont go without sulfur burner vaporizer