Zanahoria
How to recognize and treat ring rot or disease in carrots
Ring Rot Or Disease
Oomycete
Type:
Risk to the plant:
HIGH
Phytophthora Megasperma
Pathogen:
Phytophthora
WHO CAUSES IT?
Phytophthora megasperma is a pathogenic oomycete known to cause devastating diseases in various plants, including carrot. This pathogen resides in soil and water, producing resistance structures called oospores, which can survive for long periods in adverse conditions. In the presence of adequate moisture, oospores germinate and produce sporangia, which release motile zoospores. The zoospores swim to the roots of the plants, where they penetrate the tissues, initiating infection. Within the plant, the pathogen spreads through the roots and stem, causing necrosis and eventual death of affected tissues. As the disease progresses, Phytophthora megasperma forms new reproductive structures, perpetuating its presence in the environment and facilitating future infections.
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SYMPTOMS
Ring rot or disease caused by Phytophthora megasperma in carrot is characterized by a progressive decomposition of the roots and neck of the plants. Symptoms generally begin in the roots, spreading towards the stem and causing general weakening of the plant.
- Discoloration and watery Taches on the roots
- Appearance of a ring of rot around the neck of the plant
- Necrosis of root and stem tissues
- Wilting and yellowing of foliage
- Plant collapse in advanced stages of infection
DEVELOPMENT CONDITIONS
Temperature:
15°C - 25°C
Humidity:
85% - 100%
HOW IS IT SPREAD?
Irrigation water, Contaminated soil, Infected crop remains, Contaminated agricultural tools and machinery
HOW TO ELIMINATE IT?
Home treatments
Natural allies
There are no 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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REPELLENT PLANTS
Rosemary, Dill, Coriander
RECOMMENDATIONS
- Check the back of the leaves frequently, especially in dry weather.
- Spray water on the leaves to increase humidity and prevent them from settling.
- Keep plants healthy with good watering and adequate light.
- If you see cobwebs or damage, clean the leaves with a damp cloth or pressurized water.
- Use potassium soap or neem oil every few days until they disappear.
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