Powdery Mildew on my Sage: A Home Remedy
I was strolling through an open air market last summer and bought a huge sage plant at a discount. It was glorious. I brought it home dreaming of ravioli with sage-butter sauce and even crisp fried sage leaves as a snack (the best alternative to potato chips there is!), but after about a week the plant developed powdery mildew. See the little white spot on the leaf in the middle? That's it. It's insidious. I fought a losing battle all last summer and fall. When I cut the whole plant down to the stalks in early winter, I hoped that freezing temps over the season would put an end to the bug. They didn't, so here's a home recipe for an anti-powdery mildew spray:
1 cups tap water
1/4 tsp baking soda
Place into a spray bottle. Saturate leaves in the morning so they have a chance to dry out in the afternoon sun. Since powdery mildew thrives in moisture, you want to limit the time the leaves are wet. Also, if possible, water the plant from the bottom by filling the saucer with water. So, this seems a bit paradoxical. You should spray with a water solution to get rid of powdery mildew but you should keep the plant's leaves dry to retard powdery mildew growth. I dunno; for now that's the best I got.
Now if anybody out there has any better home remedies, please let me know.