The harmful fungus Uncinula necator occupies the inglorious rank of the most dangerous parasite for grapevines, because it triggers powdery mildew. This is how you fight the disease sustainably.
Powdery mildew can be recognized by these symptoms
It starts already in May. A mealy-white coating can be seen on the young leaves and shoots, which is spreading rapidly. The foliage curls up, dries up and falls off. Infected grapes harden or split open, exposing the pips.
Proven control methods in the allotment garden
The vast majority of approved fungicides are based on sulfur and copper. However, the effect is only preventive, so they should be applied in advance. The plant protection database of the Federal Office of Consumer Protection and Food Safety currently lists these preparations, among others:
- Naturen organic net sulfur WG
- Atempo Copper-Fungal Free
- Cueva Wine Mushroom Free
- Thiovot Jet
Strict observance of the most important culture conditions also makes a significant contribution to combating powdery mildew on grapevines. Plant at an airy distance in a sunny, warm spot. Don't forget to prune the vines in early spring and summer every year. In this way you elude the cunning fungal spores important targets.
GTH