Fungal disease – Alternaria alternata which causes brown spots mainly on the lower leaves of plants.
Also known as:
Leaf spot
Alternaria (Altenaria alternata) is a fungal disease whose spores overwinter in the soil on remaining foliage.
Affected plants
- Potato
- Hydrangea
- Periwinkle (Vinca)
- Tomatoes
- Tobacco plant
- Zanteschedia
- Carrot
Control
Remove affected leaves generously.
Prevention
Control with a biofungicide based on the bacterium Streptomyces griseovirides: this colonizes the root of the plant before alternaria, among others, can establish itself there.
