Below is a link to a document that has nearly every disease and pest that could affect cannabis. 1021 pages of light reading, haha. Check out some of the Chemical Controls and Cultural Practices for different crops and see what you might be able to use in your own grow. @Ladithief for powdery mildew in greenhouse cucumbers, having 3 weeks between harvest and re-plant is one measure to minimize the spore count. Page 439 has some more details.
https://drive.google.com/open?id=1zv5jH5gsYSSFZseHHaknL68mMUTZ1hjR
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