Frambuesa
How to recognize and combat crown galls on raspberries
Crown Galls
Bacterium
Type:
Risk to the plant:
INTERMEDIATE
Agrobacterium Tumefaciens
Pathogen:
Bacteriosis
WHO CAUSES IT?
Agrobacterium tumefaciens is a pathogenic bacteria that infects a wide variety of dicotyledonous plants, including raspberry. This bacterium is known for its unique ability to transfer part of its plasmid DNA (known as T-DNA) to the plant cell, inducing the formation of tumors or galls. Agrobacterium tumefaciens survives in soil and in the remains of infected plants. During favorable conditions, the bacteria are attracted to phenolic compounds and sugars released by plant roots and wounds. Upon contact with plant cells, the bacteria uses a DNA transfer system (T-DNA system) to insert its DNA into the plant genome. This causes uncontrolled proliferation of plant cells, resulting in the formation of characteristic galls on the crown, roots and stems. These galls serve as protective niches for the bacteria, allowing their persistence and spread in the environment.
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SYMPTOMS
Crown gall disease caused by Agrobacterium tumefaciens in raspberries occurs mainly in the crown and root area, although it can also affect the stems. The symptoms are initially inconspicuous, but as the infection progresses, tumorous growths or galls are observed that affect the general health of the plant. These galls interfere with the transport of water and nutrients, weakening the plant and reducing its vigor and productivity.
- Formation of galls or tumors in the crown, roots and occasionally in the stems.
- General weakening of the plant.
- Decrease in growth and development.
- Reduction in fruit production.
- Withering of the leaves.
- Regressive death of the plant in severe cases.
DEVELOPMENT CONDITIONS
Temperature:
20°C - 30°C
Humidity:
70% - 80%
HOW IS IT SPREAD?
Contaminated soil, irrigation water, cultivation tools, infected plant remains, contaminated nursery plants, plant wounds
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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