Enterobacter mori leaf spot

Enterobacter mori is a bacterial plant pathogen recognized as the causative agent of a serious vascular disease in mulberry trees. This bacterium colonizes the xylem vessels, obstructing water and nutrient transport, which inevitably leads to the decline and gradual death of affected plant tissues.

The primary host for this pathogen is the mulberry tree (Morus). While it mainly impacts the vigor of the tree and quality of the foliage, severe infections can lead to significant economic losses in regions where mulberry is cultivated for sericulture or fruit production.

Symptoms of the infection include wilting, yellowing, and necrosis of the leaves, often followed by dieback of branches. Internally, the wood may exhibit characteristic browning or discolouration of the vascular bundles, which is a clear diagnostic marker when observing cross-sections of infected twigs.

The development and spread of Enterobacter mori are heavily influenced by environmental factors such as high humidity and moisture levels. Transmission often occurs through contaminated pruning tools, insect vectors that wound the bark, and the movement of infected plant material, making early detection and strict hygiene essential.

Effective management strategies require a combination of preventative practices and chemical controls. Essential measures include disinfecting all pruning tools between trees, removing and destroying symptomatic branches, and maintaining optimal tree health through proper fertilization and watering to improve the tree's natural defense mechanisms.