GARDEN TIP: Mildew Preventative Care on Cucurbits (cucumbers, watermelon, ect.)
Because cucurbits are susceptible to powdery mildew I spray liquid Copper Fungicide on my cucumbers regularly as a preventative method especially before and after long periods of rain. It's important to avoid applying the spray during the warmest time of the day because this could burn the plant. I try and apply the spray either in the morning or in the evening when the sun is not directly on the plants. I will apply the spray once every two weeks or so but you could apply it more regularly depending on the weather. And it's always good to read the directions on the products you are using.