This is a common fungal disease called powdery mildew and often shows up on zucchini and other Cucurbitaceae family members including cucumbers, pumpkins, and melons. It usually starts on the older leaves, eventually causing them to turn brown and shrivel up, and can quickly spread if you’re not careful. Luckily, it’s easy to manage with some regular upkeep! As soon as you spot any affected leaves, remove them and toss them in the green waste bin to prevent the spread of fungal spores. To protect the rest of your plant, spray the remaining leaves with an organic fungicide like wettable sulfur or eco-fungicide. These safe, effective treatments will help keep the disease in check, so you can enjoy a bountiful harvest all season long!
