Table 1.

Plant health continuum and actions recommended.

Plant continuumRecommended action
Class 1. Normal appearance for the plant. No externally visible plant injury. No significant structural defects present.Often no action needed, but many stressors do not exhibit external symptoms in the early or mid stages of the disease or disorder.
Class 2. Minimal (less than 5%) visible plant injury detected or anticipated. The plant injury may take the form of discolored or wilted leaves, defoliation, or twig dieback among many other symptoms.Classify problem as a true threat to health of the plant or simply aesthetic injury. Notify client that injury or stressor has been observed.
Class 3. Plant injury between 5% and 10% is detected or anticipated. Plant injury can take the same forms as Class 2.Notify client that injury or stressor has been observed. Treatments may be warranted to maintain plant health.
Class. 4. Plant vitality or structure is significantly compromised by stressor(s).Intense multiple treatments are essential.
Class 5. Plant is in severe decline or a major structural failure has occurred.Remove portion or whole plant.