FUNGAL DISEASE CALONECTRIA PSEUDONAVICULATA (former name: Cylindrocladium buxicola)
This fungal disease mainly affects Buxus sempervirens. Most Buxus microphylla cultivars are less sensitive. The infestation starts with black spots on the leaves. After a few days, the affected leaves fall off in masses and turn brown. Black stripes appear on the young twigs, so-called lesions that can cause reinfection.
Treat with appropriate fungicides from May onwards. Pay special attention during warm, humid periods with a lot of precipitation. Affected plants can fully recover.
Control schedule for Cylindrocladium and Volutella: Consumer Belgium 2021
|Dosage/10 litre water
Copper-based products have a preventive effect but are less efficient. Phytosanitary legislation in Europe changes regularly. Not all products are permitted in every member state.