Help needed! These Eucalypts (same species, not sure which one) were planted 40 years ago along the property driveway by the landowner’s father. They are now dying one by one. Checked trees and couldn’t find fruit, nor buds nor flowers - very unusual. No evidence of salinity, mistletoe, insect attack so quite baffling that they go from healthy to dead with little warning.
They look like Eucalyptus mannifera subs maculosa which are a popular street tree planting in Canberra and do pretty well so not sure why they are dieing one by one.