International Society of Arboriculture
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Through research, technology, and education, the International Society of Arboriculture (ISA) promotes the professional practice of arboriculture and fosters a greater worldwide awareness of the benefits of trees. ISA is a dynamic medium through which arborists around the world share their experience and knowledge for the benefit of society. ISA is aligned on many fronts with other green organizations and is working hard to foster a better understanding of trees and tree care through research and the education of professionals as well as global efforts to inform tree care consumers. |
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Symptoms(X)
| 15 Images of 9 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 5395617 | crown thinning (pruning) | over thining | |
| 5395487 | defoliation due to unknown cause | ||
| 5395469 | drought | using indicator plants for determining water stress | |
| 5395470 | drought | using indicator plants for determining water stress | |
| 5395196 | risk tree | ||
| 5395197 | risk tree | ||
| 5395198 | risk tree | ||
| 5377015 | plant diagnostics | foliage symptoms | |
| 5377122 | chlorosis (general symptom) | ||
| 5375269 | restricted root system | Often, roots are restricted by roadways and sidewalks. | |
| 5375272 | construction | Often, construction damage is harmful to urban trees. | |
| 5375240 | decay | Large cavity and decay at the base of a standing tree. | |
| 5375261 | restricted root system | Restricted root systems shown signs of decline. | |
| 5375265 | decay | Decay indications. | |
| 5375229 | decay | Severely decayed stem |
