Even if both diseases have been on everyone's lips for some time, boxwood is not only attacked by shoot death caused by the fungus Cylindrocladium buxicola or the dreaded boxwood moth. An infestation with one of the two mildew forms is also possible, albeit rare.
White spots usually indicate mildew infestation
Powdery mildew on boxwood
There are two different variants of powdery mildew, which typically always show up in certain weather conditions. Both can be easily combated with fungicides approved for private gardens as well as with household remedies. Cut back infested areas into the healthy wood and spray the infested plant several times with horsetail broth or a mixture of whole milk and water.
powdery mildew
This form is also known as "fair-weather powdery mildew" because it only develops in dry and warm months. A typical feature is the white, mealy-looking fungus on the upper and lower sides of the leaves.
Wrong mildew
Downy mildew, on the other hand, loves humid and warm weather and is initially shown by a white coating, later by a greyish fungal growth on the underside of the leaves. These are mottled with yellowish spots on the surface.
tips
Make sure that the leaves do not get wet when watering the boxwood or can dry off quickly afterwards. Damp foliage is one of the most common causes of fungal diseases in plants.