הזיהויים של jangroen

Australian Myrtle

These almost seem to have been planted in a row (with Needlebush and Pines) presumably on an old farm boundary.

But most excitingly lots of them are dead. Anyone know why? I know of a seed biocontrol agent, but not anything affecting growth: there is no obvious diesease, parasitism, fungus or ringbarking of the plants: they are just dead.