Frambuesa
How to recognize and combat white leaf spot or septoria in raspberries
White Leaf Spot Or Septoria
Fungus
Type:
Risk to the plant:
HIGH
Septoria Sp. / Sphaerulina Sp.
Pathogen:
Septoriosis
WHO CAUSES IT?
Septoria sp. and Sphaerulina sp. They are phytopathogenic fungi responsible for causing white leaf spot or septoria in raspberries. These fungi survive on infected plant remains and in the soil during the winter, waiting for favorable conditions for their development in the spring and summer. Spores are spread by wind, rain and irrigation water, infecting new plants when moisture conditions are suitable. Once the spores land on the surface of the leaves, they germinate and penetrate the leaf tissue through stomata or wounds, initiating the infectious process. Inside the leaf, the fungus grows and forms reproductive structures known as pycnidia, where new spores are produced and released to continue the infection cycle. This process can be repeated several times during the growing season, especially under weather conditions favorable to the fungus, such as high humidity and moderate temperatures.
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SYMPTOMS
White leaf spot or septoria in raspberries initially manifests as small brown Taches that enlarge and turn white in the center, surrounded by a dark border. These Taches can converge, causing extensive necrosis of the leaf tissue and weakening the plant. Severe infection can significantly reduce functional leaf area, affecting photosynthesis and, consequently, fruit production.
- Brown Taches that enlarge and turn white in the center.
- Dark edges around the stains.
- Extensive necrosis of the leaf tissue.
- Premature defoliation.
- Reduction in the photosynthetic capacity of the plant.
- Decrease in fruit production.
- Plants weakened and more susceptible to other diseases.
DEVELOPMENT CONDITIONS
Temperature:
15°C - 25°C
Humidity:
70% - 90%
HOW IS IT SPREAD?
Wind, rain, irrigation water, contaminated tools, contact with infected plants, remains of infected plants in the soil
HOW TO ELIMINATE IT?
Home treatments
There are no home treatments
Natural allies
Chemical treatments
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
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