By Kentishman58
United Kingdom 
Hi ,The Cornus Alba i planted last year has started dying back with leaves turing brown and falling, including new leaves. I assume this is some sort of fungal disease but i thought Cornus very rarely succumbed??!!! Maybe is due to the very wet Spring we had? I have looked at other Cornus in the locality and they seem fine. Any thoughts would be very welcome, thank you
28 Jun, 2014
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If twigs are dying back as well, and there any black lesions anywhere, it could be a phytophthera infection, in particular P. kernovaie or P. ramorum - if you suspect its that, the RHS has a page on these infections, and a link to the Plant Health and Seeds Inspector, because both these infections are notifiable.
It's unlikely to be Cornus anthracnose - this infection doesn't seem to trouble C. alba varieties.
29 Jun, 2014