Help please id Rhododendron leaf disease

[evergreen]

Hi Guys

Any ideas on what this is would be great. There are 3 Rhododendrons in a row. One healthy, next poorly(this one), last on v dead!

Cheers

[Guest Infinitree]

Could be Phytophthora mate

[evergreen]

Thanks Infinitree, not sure if it is. Tissue not soft and water soaked and no blackening of leaf petiole. Im flummoxed at the mo!

[Guest Infinitree]

No problem! Yeah see what you mean, often there is dieback of the stem/petiol.

Whats the drainage like? Some of these fungi produce similar symptoms; Botryis, Pestalotia, Phyllosticta and Septoria..

[evergreen]

Drainage is good, there is some shading from large Oak trees. Thanks for the suggestions, will read up on them and hopefully find out what it is. Phyllosticta looks interesting! Thanks again