Leaves covered with a whitish coating, some of which may fall off or curl up, are a clear indication of mildew infestation. While the downy mildew occurs mainly in damp weather, the real one is a fair-weather fungus.
prevent powdery mildew
Powdery mildew is a fungal disease that primarily attacks stressed plants. Make sure your magnolia gets enough light and air, keep the soil moist - but not wet - during dry periods and mulch the root area. This allows you to prevent the disease from eating the affected leaves and shoots from the outside. Powdery mildew causes more serious damage than the false one, as it can penetrate the leaves and eventually kill the plant.
treatment of powdery mildew
To stop the spread of mildew, you should immediately remove affected leaves and shoots. Some organic and easy-to-make sprays, such as nettle and garlic decoctions, can increase the plant's resistance to powdery mildew. As a non-organic method, you can also spray with a chemical fungicide, which can also be done preventively in spring - before the leaves sprout.
tips and tricks
Milk can also help against powdery mildew, because the lactic acid bacteria inhibit the development and spread of the fungus. To do this, mix milk and water in a 1:10 ratio and spray the plant for about 10 to 14 days.