Here's what killed my cukes

[LK2016]

Believe it or not, I have had a lot of success keeping powdery mildew under control by spraying a diluted milk solution on the leaves when I first see signs of mildew. I just take a 24-30 oz spray bottle, pour in some milk (a tablespoon or so), and spray tops/bottoms of leaves. It actually really helped! I use it on cucumbers, zucchini, yellow squash, and melon plants.