Arthrobacteriosis

Arthrobacter agilis is a species of soil-dwelling bacteria that can occasionally function as a plant pathogen. While primarily known as soil decomposers, certain strains have demonstrated the ability to colonize plant tissues, leading to clinical symptoms of disease in various agricultural and horticultural host plants.

This pathogen acts primarily through the degradation of plant cell wall components, which leads to tissue necrosis and systemic vascular infection. The disease is categorized as a bacterial soft rot or vascular wilt, depending on the specific host plant and the environmental conditions prevalent during the infection cycle.

Susceptible crops include a wide range of vegetables and root crops, particularly those grown in intensive agriculture systems. The bacteria thrive in environments with high moisture levels and poor soil aeration, which facilitate the migration of bacterial cells towards the root system through the soil water film.

The primary symptoms associated with Arthrobacter agilis infection manifest as water-soaked lesions that later turn brown or black. Affected plants often exhibit wilting during the hottest parts of the day, followed by stunted growth and yellowing of the lower leaves. Severe infections lead to the total collapse of the plant due to the disintegration of internal tissues.

Effective management and prevention strategies include crop rotation, the use of disease-free planting material, and the application of biological control agents that compete with pathogenic bacteria in the rhizosphere. Maintaining balanced soil fertility and avoiding excessive watering are crucial to preventing the rapid multiplication and spread of the pathogen in the field.