Bacterial leaf spot
CLASSIFICATION
Bacteria, Gammaproteobacteria
ABOUT
Bacterial leaf spot is caused by the bacteria Xanthomonas and Pseudomonas. Typical symptoms are black spots on the leaves or black-edged lesions and light and dark areas on the leaves, which usually develop on older leaves.
How to treat?
- Biological
If possible remove and destroy the infected plant. Burn it or toss it into the garbage. Do not compost.
- Chemical
If necessary, apply copper spray as a bactericide. It will reduce the spreading of bacteria.
If necessary, apply bactericide containing streptomycin (GHS08: Health hazard). It will reduce the spreading of bacteria.
- Disease prevention
Keep the moisture low, avoid prolonged wetting of the leaves (e.g. by overhead irrigation) and ensure good soil drainage.
Use resistant species and cultivars as well as healthy, certified seeds and seedlings.
Use healthy, certified seeds and seedlings.
Avoid mechanical damage to plants. Injuries provide a point of access for the bacterium.