This type of tree survey identifies defects such as weak branch junctions or decay fungi which can affect the structural integrity of trees. Tree failure can be catastrophic, causing death or serious harm to persons or property. is the most economical type of tree survey. All trees will be inspected, but only details of those trees which are potentially hazardous are recorded within the tree report. Clients with a large number of trees and a limited budget tend to favour this type of tree survey.