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Eureka-this is a relief...

Posted by hairmetal4ever Z7 MD (My Page) on
Fri, Apr 25, 14 at 14:52

Last fall, I noted (and others on GW also) that a lot of local oaks, mostly in the red group, but primarily Pin (Q. palustris) and Northern Red (Q. rubra) were looking "bighted" with blotchy brown spots that eventually turned whole leaves brown and they fell. Oddly, Scarlet Oak, Q. coccinea, seemed relatively unaffected despite being closely related to the 2 other species.

I was initially concerned about a big Bacterial Leaf Scorch outbreak. However, I think it might have been Taphrina caerulescens, or Oak Leaf Blister. A relatively minor disease that is worst after a wet, cool spring (which we had last year, this year as well it appears).

Does this make sense and match what others have seen?

Here is a link that might be useful: Oak Leaf Blister

Follow-Up Postings:

RE: Eureka-this is a relief...

One of my Quercus Robur had webworms, and round brown disks on it's upper surface of leaves last early fall, or late summer. I will have to get Bt for the wormies. The brown disks may be from humidity, I'm guessing. I haven't seen anything on my red oaks though. I have Pin, Shumard, Scarlet, Nuttals, Durand and Willow oak. My Willow looks possibly dead from last winter

RE: Eureka-this is a relief...

Yeah - Willow Oak (Q. phellos) is rated zone 6, but could probably perish in a very harsh zone 6 winter.

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