Plant lactococcosis

Plant lactococcosis is a bacterial disease caused by certain strains of the Lactococcus genus. While these bacteria are industrially significant, their pathogenic interactions with botanical hosts are a subject of concern, as they can cause significant vascular and tissue degradation in various agricultural crops.

The pathogen consists of Gram-positive facultative anaerobic bacteria. The disease is primarily categorized as a soft rot or a systemic bacterial infection. These bacteria enter the plant through natural openings or wounds, where they proliferate by breaking down cellular walls through the enzymatic hydrolysis of pectin substances.

Symptoms typically manifest as chlorotic patches that progress into dark, water-soaked lesions. In advanced stages, the plant exhibits tissue maceration, often accompanied by a distinct odor. Systemic infection leads to the wilting of stems, stunted growth, and ultimate collapse of the affected plant parts.

The development of lactococcosis is heavily favored by environmental conditions, particularly high humidity and poor soil drainage. Temperatures between +20°C and +28°C provide an ideal environment for rapid bacterial multiplication. In greenhouse conditions, poor air circulation significantly exacerbates the spread of the pathogen.

The economic impact of the disease is significant, as it can compromise an entire harvest within a short period. Effective prevention and control strategies include:

• Strict adherence to sanitation protocols and crop rotation.
• Thorough disinfection of tools and greenhouse equipment.
• Management of soil water levels and irrigation techniques.
• Strategic application of copper-based bactericides and biological controls to minimize infection pressure.