I love squash, zucchini, cucumbers, melons, pumpkins...the list of wonderful things affected by annoying Powdery Mildew goes on and on. I have a bunch of the above planted in my garden right now and I slacked a little recently on garden upkeep and low and behold look at my squash leaves! Attack of the Powdery Mildew! I have to get out there this week and cut out all of the leaves already affected and spray the others with a natural powdery mildew deterrent...
1 quart water
1 tsp. baking soda
1 tsp vegetable oil
1 tsp dishwashing liquid
This spray will not do anything to save infected leaves, those should just be cut away. There is a commercially organic option called Neem Oil that treats existing powdery mildew, but I chose to cut mine out and start fresh. Prevention is what is important and I really dropped the ball on my squash plants. All will be well soon, though!