Observation 95256: Cronartium quercuum (Berk.) Miyabe ex Shirai
When: 2011-05-29
No herbarium specimen

Proposed Names

44% (2)
Eyes3
Recognized by sight: On pine in the east.
Used references: Westcott’s Plant Disease Handbook 7th Edition

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Nice papers
By: Byrain
2013-06-10 11:54:29 CDT (-0400)

Yea, seems both can infect Pinus banksiana, looking in westcott’s plant disease handbook suggests one might be more western and the other eastern, your papers doesn’t report Endocronartium harknessii from Wisconsin, but does report Cronartium quercuum from WI. I still think the range may suggest C. quercuum more…

The means of differentiating them sounds interesting though..

“Isoenzyme and protein analysis of aeciospores can differentiate between Endocronartium harknessii and C. quercuum, and between the formae speciales of C. quercuum (Powers et al., 1989).”

Can be either species
By: Andrew Khitsun (Andrew)
2013-06-10 11:12:20 CDT (-0400)

I looked into this issue. According to DISEASES OF TREES & SHRUBS (Sinclair et al., 1987) the galls of Cronartium quercuum and Endocronartium harknessii are indistinguishable, and only micro analyses would show the species. Both species readily infect Jack Pine Pinus banksiana (the host in this case). Oaks from the Red Oak group are also present on the location, which MAY suggest Cronartium quercuum (but nothing precludes Endocronartium harknessii from being here – various oaks from this group are very typical in the Wisconsin landscape and mingle with pines all over the place). Here are two papers on the subject:

http://www.eppo.int/...
http://www.eppo.int/...

If someone has more suggestions, please pitch in!

What kind of pine?
By: Byrain
2013-05-31 17:47:32 CDT (-0400)

Were there any oaks nearby?

Nice work Andrew!
By: John Steinke (John Steinke)
2012-05-23 07:10:47 CDT (-0400)

Created: 2012-05-21 19:56:38 CDT (-0400)
Last modified: 2013-06-10 11:17:37 CDT (-0400)
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