Cylindrocarpon root rot

The disease is caused by the fungus Cylindrocarpon didymum, a widespread soil-borne pathogen. It primarily targets the root system and the lower stem of plants, leading to severe vascular damage and preventing the uptake of water and essential nutrients.

This pathogen affects a wide range of host plants, including vegetable crops like tomatoes, peppers, and cucumbers, as well as several ornamental species. It is particularly dangerous in nursery settings where young, sensitive plants are grown in confined environments with high humidity.

Typical symptoms include browning and softening of the roots, often starting from the root tips and spreading upwards. As the disease progresses, the stem base may exhibit dark, sunken necrotic lesions, leading to leaf yellowing, stunting, and eventually the death of the entire plant.

The development and spread of Cylindrocarpon didymum are heavily influenced by environmental factors such as excessive soil moisture, poor drainage, and low-light conditions. The fungus survives in contaminated soil or infected organic debris and spreads through water splashes, contaminated tools, or infected nursery stock.

Managing this root rot requires an integrated approach to minimize soil contamination and promote plant health. Key strategies include:

• Using pathogen-free, high-quality seeds and planting materials.
• Implementing strict sanitation protocols for greenhouse tools and equipment.
• Improving soil drainage to prevent waterlogging and reduce fungal growth.
• Practicing crop rotation to avoid the buildup of soil-borne inoculum.
• Applying preventive biological treatments to strengthen the plant's root environment.