Conifers dying

[WilliAm444]

Could anyone shed any light on why some of these conifers in this hedgerow have died?

 

I can’t see any fruiting bodies around the stumps.

 

Thanks for any help in advance.

 

[Khriss]

Wider picture on the issue needed - is there a chance of water-logging the roots ( leaky pond ? ) Neighbour complaint ( copper nailing )  an how long they been in ? Looks like a landscaped job to my eye ? K

[Gary Prentice]

Lesions on the stems?

 

I think it's unlikely to be ground moisture - more likely to be evident to all of the trees.

Copper nails - Urban myth IME

 

Were they large transplants?

[WilliAm444]

Fairly new owners, when they moved in they were already dead.
I didn’t notice any lesions, they are surrounded by shingle but I would have thought they’d all be dead if that was the issue.

[WesD]

Targeted maybe? Has a neighbour sprayed them?

[WilliAm444]

Possibly and never owned up

[daveatdave]

conifer mite and aphid it will spread to the others there is a lot of it about  

[Graham]

Phytophora lateralis.

[Khriss]

Ah Gary ! Tiznt, copper nail plus acidic ( sulphur dioxide air pollutant + water = sulphuric acid + copper = copper sulphate , very toxic to plants )  rainfall = nasty blue crystals seen on copper parts in some acidic water areas. k