Lasiodiplodia missouriana

Lasiodiplodia missouriana is a fungal phytopathogen belonging to the family Botryosphaeriaceae. It is classified as an ascomycete fungus known for causing various wood-inhabiting diseases, characterized by necrosis, cankers, and dieback in a wide range of woody hosts.

The disease cycle typically begins when the fungus colonizes woody tissues through natural openings or pruning wounds. It frequently affects fruit-bearing trees and vines, leading to symptoms such as branch dieback, vascular discoloration, and potential fruit rot. The pathogen thrives as a latent infection until the host experiences stress.

Biologically, the fungus produces pycnidia which release spores into the environment. Rain splash and air currents are the primary mechanisms for local spread. The pathogen is highly adapted to opportunistic infection, effectively targeting weakened trees that have been compromised by drought, extreme temperatures, or previous mechanical damage.

Favorable conditions for infection and disease progression include prolonged periods of high humidity and warm temperatures. The fungus can persist in infected dead wood or debris within the orchard or field, serving as a reservoir for subsequent infections during the following growing seasons.

Integrated management is essential to minimize the economic impact of this pathogen on horticultural crops:

• regular removal of symptomatic or dead wood;
• disinfection of pruning tools between trees;
• application of protective fungicidal coatings on major pruning cuts;
• monitoring host vigor to minimize stress.