Fusarium rot (Fusarium breviconum)

Pathogen and disease type
The causal agent of this disease is the fungus Fusarium breviconum, a member of the diverse Fusarium genus. It is a filamentous pathogen that causes systemic infections in plants. The disease is primarily categorized as a soil-borne fungal rot that damages vascular systems and tissue structure, leading to seedling blight, root rot, and stem rot.

Host crops
The pathogen primarily affects small-grain cereals such as wheat, barley, and rye. Research has also identified Fusarium breviconum in maize, where it contributes to stalk rot complexes. Its ability to survive in plant residues makes it a significant threat to various agricultural crops grown in rotation with susceptible cereals.

Symptoms and signs
Typical symptoms include discoloration and decay of the root system and the lower stem. Infected plants often exhibit stunted growth, yellowing of leaves, and premature wilting. In mature crops, it may cause the formation of bleached or sterile ears. Under high humidity conditions, a cottony mycelial growth, often white to pinkish, appears on the surface of the infected tissue.

Environmental conditions and impact
The development of Fusarium breviconum is favored by warm temperatures (18–25°C) and high soil moisture levels. The fungus overwinters in crop debris and contaminated soil, serving as a primary inoculum for the next growing season. Its impact is severe, resulting in reduced grain yield, poor grain quality, and the potential contamination of grain with harmful mycotoxins that threaten food safety.

Protection and control measures
Control strategies focus on integrated pest management practices. Crop rotation, avoiding continuous monocropping of cereals, is crucial to reducing inoculum pressure. Growers should prioritize the use of high-quality, fungicide-treated seeds. Additional measures include proper tillage to bury infected residues, balanced fertilization to improve plant vigor, and targeted fungicide applications during the vegetative stages if environmental conditions trigger an outbreak.