miked's picture

_MG_2509 tree disease

Observed: 15th July 2012 By: miked
iSpot team
Fungi and Lichens expert

Walking in the woods came into an area where the trees were dead. Norway maple and sycamore were affected but also some huge norway spruce were also dieing.
Leaf spots on the Acers and the needles were falling off the Piceas. No obvious fungal growths on the ground and trees around (beech/hornbeam/cherry) were healthy. there was a small area of cherry laurel that was also healthy.


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Species interactions

Species with which Cristulariella depraedans interacts


miked's picture

The condition on acers might

The condition on acers might be Cristulariella depraedans but why are the Piceas dieing in the same place? Seems this species might be able to infect a range of other species and the range is increasing?

miked's picture

Comments from person at

Comments from person at Foresty reserch organisation my identification confidence is based on this:

"I have had a look at the photos and can make the following

Sycamore - Almost certainly the leaf spot disease Cristulariella depraedans which is widespread and severe this year.

Norway spruce - Likely to be the effects of the Green Spruce Aphid.
Older needles yellow, brown then fall but current growth is OK.

Norway maple - possibly the effects of mildew but could also be Cristulariella.

To confirm the above I would need samples of course but I am fairly confident that these are the most likely diagnoses"