Its preventive. I don't usually use anything like that or much Eagle 20. I have used Eagle 20 in the past indoors on the plants in veg about to go into bud just to ensure any spores are gone and the bud rooms stay clean, but outdoors I wanted to know of any tips or strategies for fighting and preventing mold issues. Using inline fans I seen helped to dry out plants from "staying" wet. SubCool420 uses a bacteria that is mixed a foliar feed that is organic as you can get that kills bud mold and doesn't effect the plant. This is not as effective as Eagle 20 but that stuff is toxic. Kyle Kushman has a recipe for mixing up a foliar spray using synthetics and organics as a mold/pest/feed spray.
So from what Ive gathered it really depends on where you are...almost season to season. So there are basically many "Micro" weather/environments systems all over the NE.
Any strains that are resilient in the NE? I know GDP, Northern Lights, Blue Dream and White Widow grow nicely in that area.