With the cool nights and warm days of Arizona fall, our environment becomes more welcoming to the growth of many fungi and mildew species that grow on plants. With your winter flowers planted, you should look out for one of the most frequent afflictions, powdery mildew. This mildew will appear on your plant’s leaves or petals as a white and chalk-like substance. The mildew covers the leaves and petals, blocking out sunlight and preventing plants from creating necessary nutrients to survive.
To protect your plants, you should consider spraying plant foliage or treat the soil with fungicide. This will help to ward away mildew and other infections before they reach your landscape. If your plant is already suffering from powdery mildew, you should consult a professional at your nearest nursery or home store for the best treatment option for your specific landscape.