Bacterial Disease
DiseasesA plant disease caused by pathogenic bacteria that typically enter through wounds or natural openings and cause symptoms like oozing, wilting, or galls.
Bacterial diseases of trees are caused by single-celled prokaryotic organisms that infect plant tissues through wounds, natural openings like stomata and lenticels, or insect feeding sites. While less common than fungal diseases, bacterial infections can be extremely destructive and are generally more difficult to treat because antibiotics for plants are limited and often impractical.
Notable bacterial tree diseases include fire blight (caused by Erwinia amylovora) which devastates apple and pear trees, bacterial leaf scorch (Xylella fastidiosa) which affects oaks, elms, and sycamores, and crown gall (Agrobacterium tumefaciens) which induces tumor-like growths on roots and stems. Wetwood or slime flux, caused by various bacteria, produces foul-smelling ooze from wounds in elms, oaks, and other species.
Management of bacterial diseases focuses heavily on prevention because treatment options are limited. Strategies include selecting resistant cultivars, avoiding wounding trees, sanitizing tools between trees, managing insect vectors, and removing infected tissue with proper sanitation cuts. For fire blight, copper-based bactericides applied during bloom can reduce infection. Research into bacteriophages (viruses that attack bacteria) represents a promising future direction for biological control of bacterial tree diseases.