Wilts (fungal)

The host range of Fusarium wilt is exceptionally broad, affecting hundreds of plant species including tomatoes, cucumbers, cotton, legumes, and various cereal crops. It is particularly problematic in intensive cultivation systems where monocropping or short crop rotations are practiced, providing the pathogen with a constant supply of susceptible hosts.

The primary symptom is the wilting of foliage, which typically starts at the lower leaves and progresses upward. As the disease advances, the vascular tissue inside the stems and roots exhibits a characteristic dark brown or reddish-brown discoloration, caused by the fungal mycelium clogging the plant's xylem and limiting water transport.

Development and spread are favored by warm soil temperatures, high humidity, and poor soil drainage. The fungus enters the plant through the root system, often exploiting wounds caused by nematodes or improper cultivation practices, after which it colonizes the vascular system and disrupts normal physiological functions of the plant.

The economic impact of Fusarium wilt is severe, leading to significant yield losses or total crop failure in susceptible varieties. Effective disease management requires an integrated strategy, including the use of resistant cultivars, rigorous sanitation practices to prevent the spread of contaminated soil, crop rotation with non-host plants, and the application of biological control agents like Trichoderma species.

• Utilizing certified disease-free seeds and transplants.
• Maintaining balanced soil fertility and avoiding nitrogen excess.
• Disinfecting greenhouse tools and equipment regularly.
• Implementing long-term crop rotation cycles.