e spots enlarge and the fungus grows, the chlorotic lesions turn purple with necrotic centers, and a whole leaf can be covered by white fungal growth. Under high humidity and cloudy conditions, white
            mildew may also be observed on the under-surfaces of leaves. Severe infections may result in twisted and deformed leaves. Petioles and stems may occasionally be infected, but the fruit remain uninfected. <br><br> High humidity
            is favorable for the development of powdery mildew, but free 