Tree Care Glossary & Encyclopedia

A plant disease caused by pathogenic bacteria that typically enter through wounds or natural openings and cause symptoms like oozing, wilting, or galls.

A rapid and severe plant disease that causes sudden browning, wilting, and death of leaves, flowers, branches, or entire plants.

A localized dead area on the bark or cambium of a tree trunk or branch, caused by fungal or bacterial infection, that often appears as sunken, discolored, or cracked bark.

A condition in which leaves produce insufficient chlorophyll, resulting in yellowing of leaf tissue while veins may remain green, often caused by nutrient deficiency or high soil pH.

The progressive death of branches starting from the tips and advancing toward the trunk, often indicating underlying disease, root damage, or environmental stress.

A plant disease caused by pathogenic fungi, which represent the largest and most diverse group of tree pathogens.

A common group of foliar diseases that produce discrete spots or lesions on leaves, caused by various fungi or bacteria.

A microorganism such as a fungus, bacterium, virus, or phytoplasma that causes disease in plants.

A disease in which fungal or oomycete pathogens decay the root system of a tree, causing decline, instability, and potentially death.

A plant disease in which the vascular system becomes blocked by a pathogen, preventing water transport and causing leaves and branches to wilt and die.