Hi everybody!!!

Im fairly new to gardening since we bought our new house that came with one. I transplanted 4 zucchinis into the soil. Three of which are planted on a mound. However, I started noticing this week a few of the leaves are turning yellow on some spots then drying to a crisp. I pruned the ones that are basically done for.

I will say that I used a homemade bug killer with water, garlic a little bit of dish soap all over the plants. I don't know how to stop them from dying!