Enterobacter plant bacterial rot

Enterobacter cancerogenus is a phytopathogenic bacterium capable of inducing various pathological conditions in plants, primarily recognized as a causal agent of bacterial soft rot and necrotic lesions. Classified as a Gram-negative facultative anaerobe, it disrupts the physiological processes of its hosts, leading to significant yield losses in commercial agriculture.

The host range of Enterobacter cancerogenus is diverse, affecting various horticultural and ornamental crops including tomatoes, potatoes, and woody species. The infection usually initiates through stomata, lenticels, or mechanical injuries caused by biotic or abiotic factors. Once internal, the pathogen secretes extracellular enzymes that degrade plant cell walls, leading to tissue collapse.

Key symptoms include the development of water-soaked lesions that quickly progress into necrotic patches. In advanced stages, the affected tissue undergoes maceration, often accompanied by a distinct, foul odor characteristic of bacterial decay. Vascular involvement may lead to systemic wilting, where the plant foliage remains green but loses turgor and eventually dies as the vascular transport system is blocked by bacterial colonies.

The spread and development of the disease are heavily influenced by environmental conditions, specifically high humidity and temperatures between 20°C and 30°C. The pathogen can persist in infested soil, decaying organic matter, and on seed surfaces. Spread within fields occurs via splashing rain, irrigation water, contaminated pruning tools, and insect vectors that transfer bacteria during feeding or movement.

Integrated management is essential for controlling Enterobacter cancerogenus in commercial systems:

• Implementation of rigorous sanitation practices, including tool sterilization.
• Avoidance of overhead irrigation to reduce leaf wetness duration.
• Selection of high-quality, pathogen-free seeds and planting material.
• Crop rotation to reduce the inoculum load in the soil.
• Effective management of insect pests that act as primary vectors for bacterial spread.