Shoveling Sand against the Tide?
With regards to pre-emptive care: Does anyone have successful experience staving off fungal diseases in their gardens?
The delphiniums and lupins are in deep trouble from mildew - but, this is mostly my own darn fault from crowding them. I haven't bothered to spray them with a fungicide. They've just about completed their blooming so have mostly come in under the wire and can face cutback without too much weakening.
The Shasta daisies were moved this year and so are a little late but whatever causes the bronzing of their leaves has begun. Their blooming could be so much extended if whatever this is didn't beat the tar out of them. I have a rustic's appreciation for Shastas. They are so bright and look wonderful in contrast to the bold colors of other flowers (pretty in a breeze, too :o).
I've used daconil with limited success to pre-empt black spot on zinnias and rust on snapdragons. It is supposed to have some systemic value. Not sure if it is really effective in either case since weather seems to have so much to do with all these fungal diseases.
In the past, I've gotten thru entire seasons with hardly any appearance of rust on the snaps, even without spraying. Last year, I sprayed them regularly with daconil and they slowly and steadily developed rust as the season progressed. Even lost a few of the plants by late September, all the while - spraying them weekly.
Am I wasting my time? Are there other remedies or would you encourage me in my continuing regular spraying with daconil?