Fusarium fruit rot

Fusarium fruit rot is caused by the fungus Gibberella pulicaris (anamorph Fusarium sambucinum). It is a significant phytopathogen capable of causing necrotic lesions on various crops. The pathogen is known for its persistence in the environment, utilizing soil organic matter as a reservoir for survival during off-seasons.

The fungus has a broad host range, notably affecting strawberries, which are highly susceptible during wet ripening seasons. Beyond berries, the pathogen can infect potatoes, various legumes, and certain cereals. Its ability to switch between hosts makes it a complex pathogen for integrated pest management programs.

Symptoms initially appear as small, water-soaked spots on the fruit surface. As the infection progresses, these areas enlarge, darken, and develop a white or pinkish fungal mycelium. Infected tissues eventually lose their firmness, leading to complete decay and the mummification of the fruit if left in the field.

Environmental conditions are critical for the development of fruit rot. High humidity, mild temperatures, and prolonged moisture on plant surfaces are ideal for spore germination and colonization. Mechanical damage, whether caused by insects, equipment, or harsh weather, significantly increases the likelihood of infection in healthy fruits.

Effective management strategies include cultural practices such as crop rotation, sanitization of fields to remove inoculum sources, and improving air circulation through proper plant spacing. Fungicide applications during the flowering and early fruiting stages are recommended in high-risk areas to minimize economic losses and ensure harvest quality.