Powdery mildew - spireas, etc.
Anybody have any sure fire home-type remedies for this? (I did find a few in garden books and on an old posting here - skim milk and a baking powder mixture recipe.) Here's my scenario - makes me wonder if it's in the soil .....
Had four (green leaf) spiras in the back courtyard which were beautiful for the first two years, but have been afflicted yearly ever since. This seems to hit very fast and withers the bloom (which should be right about now!). Last year I hacked them back down, they rebounded, but didn't re-flower.
Now ..... this year I moved two of them out front - they're fine, as are the four gold leaf spireas in the same bed, but the two left out back are again and suddenly ailing badly. For the most part, nothing else in the same bed is ailing (I did put in bee balm last spring, that got pretty 'dusty' as bb is wont to do, but the spirea ailment preceded the bb arrival).
Is this affliction something that can lurk in the ground? The bed is re-mulched w/rotted leaf compost every spring. Any ideas will be appreciated!