We've had a much cooler summer this year than I can recall in a long time. Perhaps due to this, I've had a lot more powdery and downy mildew than ever before. I'm in the process of removing the plants that have been struck--they're either annuals or deciduous so I'm not treating them, but I'm wondering if I should do something to the soil to prevent, or at least try to prevent it returning next season?
Is there anything that can be done now? All advice is welcome.
In case it's helpful, I live in north-central Massachusetts, zone 5b.