Fusarium rot

Fusarium rot is a widespread fungal disease caused by the pathogen Gibberella avenacea. This organism acts as both a saprophyte in soil and a serious plant pathogen, capable of infecting a vast range of hosts by penetrating through wounds or natural openings in the plant epidermis.

The disease causes significant economic losses across various agricultural sectors. Specifically, it is known to affect stone fruits like the peach, causing severe rot of the fruits before and after harvest, as well as developing lesions on twigs and branches that may result in twig blight and branch dieback.

Symptoms typically include sunken, brown-to-grey lesions on the surface of the affected plant part. Under conditions of high humidity, a distinctive mycelial mat, often whitish or pale pink in color, develops on the surface. These spots enlarge rapidly, leading to the rapid decay of the fruit flesh and eventual collapse of the structure.

Development and spread are favored by moderate to warm temperatures combined with high moisture. Mechanical damage to the fruit surface (caused by insects, wind, or hail) serves as an entry point for the spores. The fungus can survive in crop residues and soil, acting as a constant reservoir for infection during the next growing season.

Effective control requires an integrated approach. Essential practices include sanitation, such as the pruning and destruction of infected twigs and the removal of fallen mummified fruits. Fungicide applications during flowering and fruit development are crucial for susceptible varieties. Post-harvest, maintaining cool temperatures and sanitizing storage containers are essential to prevent the spread of the pathogen.