Update 1 July 2026
BOX TREE CATERPILLER
The box tree moth flight is still underway, but young caterpillars have already been found as a result of the extreme weather. It is therefore gradually time to treat the plants again. This is best done using Conserve Garden, which is based on spinosad. This product is authorised for use in the organic cultivation of vegetables, fruit and ornamental plants. Products based on Bacillus thuringiensis are also effective and organic, but are not available in Belgium for domestic use. Chemical caterpillar control products also work very well and, according to the latest scientific studies, are not harmful to birds.
More info on our page about Box tree caterpiller
BOXWOOD BLIGHT
Due to the thunderstorms, the risk of fungal disease is high and treatment is necessary, particularly in dense clumps, bulbs and hedges. Regular treatments help to keep the disease under control.
More info on our page about Boxwood Blight
BOX TREE CATERPILLER
The caterpillars are bright green with a black head. This Asian butterfly can grow as big as 4 cm. There are two generations in Belgium : April/May and August.
BOXWOOD BLIGHT
The investation starts with black spots on the leaf. A few days later the affected leaves will fall down en masse and black stripes appear on the young twigs.