Pine Stem Rust Management Guidebook

Table of Contents


Hazard: the degree to which the characteristics of a tree or stand make it vulnerable to damage. It is equivalent to susceptibility.

Hypertrophy: enlargement or overgrowth due to abnormal increase in sizes of cells.

Incidence: the proportion of damaged or affected trees within a stand or area.

Lethal canker: an infection located on or within 15 cm of the stem (not prunable) or one located within 60 cm of the stem if no treatment is planned.

Non-lethal canker: an infection located more than 15 cm from the stem and, therefore, prunable.

Pathogen: any agent, whether a living organism or abiotic agent, that induces disease.

Risk: the probability and expected severity of damage as determined by a function composed of host susceptibility, suitable environmental conditions (both combined equate to hazard), plus pathogen proximity, abundance, and virulence.

Signs: visible portion of a pathogen, or its products, seen on or in the host plant.

Stand dynamics: the study of changes in forest stand structure over time, including stand behavior during and after disturbance.

Symptoms: visible reaction of the host plant to infection, disease, or other pest attack.

Walkthrough: initial reconnaissance of an area used to make a preliminary assessment of site conditions and suitability for further surveys or activities.

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