here in wonderful western Pennsylvania
it has been raining all of June
most storms come with little wind
so the rain, lack of sunlight, lack of wind, and humidity
are a good recipe for mold, mildew, slugs and insects
so the strategy here is to:
no windbreaks to allow for air movement
thin out lower limbs
plant at wider spacings
keep ground cover in check (chop and drop) as it grows quickly
forgo
canopy trees to allow more sunlight (clouds are the canopy here)