CUCUMBER HELP

This is my first time growing cucumbers and I’m very new to gardening in general. Can someone help me figure out what is going on with my plants? I tried researching but it doesn’t really look like anything I’m finding. I have been fighting off aphids but from what I’m finding online it seems like this is not from them? I’m also seeing powdery mildew in my searches but it doesn’t really look like that either. I’ve been using Maggie’s Farm 3-in-1 garden spray to try and get rid of the aphids. Any advice would be greatly appreciated! I’m located in North Texas and my garden is only in full sun for about 6 hours.