Selection and testing of plant material for urban areas | Studies on the tolerance of trees to diseases, the urban climate, pollutants, etc. | 60 |
Establishment of street trees and urban woodlands | Studies concerning the technical aspects of establishment, such as planting methods, protection, and planting containers. | 48 |
Growing media, mixtures, and soils | Studies concerning new growing media for urban trees | 22 |
De-icing agents | Studies looking at the effects of de-icing agents on vegetation, as well as the projection of trees against damages. | 13 |
Roots and/or mycorrhizae | | 12 |