Observation 167733: Graphiopsis chlorocephala (Fresen.) Trail
When: 2014-06-18
No herbarium specimen

Notes: Rust or smut.

Proposed Names

-4% (2)
Recognized by sight
28% (1)
Recognized by sight
Used references: Google images, westcott’s plant disease handbook
48% (2)
Eye3 Eyes3
Recognized by sight: Current name according to mycobank.
Used references: http://www.mycobank.org/...

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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Thanks, Byrain.
By: Daniel B. Wheeler (Tuberale)
2014-06-19 09:17:14 CEST (+0200)

I think mycobank probably has the most current name. My suggestion was from 1991.

Peony
By: Daniel B. Wheeler (Tuberale)
2014-06-19 08:15:21 CEST (+0200)

was a single rather ornate hybrid from Japan, I think. It bloomed rather spectacularly this year, drawing many comments from passers-by. Not a tree peony, so I think we can rule out canker.

No stalks affected that I can see. No stalks really affected at all: that seems to reduce the list significantly.

The fact this is growing in Oregon further reduces the possibilities.

I think I’ll access the OSU database for peony diseases.

Thanks for suggesting these, Byrain.

Shot in the dark,,,
By: Byrain
2014-06-19 05:01:29 CEST (+0200)

Here are the choices I see in westcott’s plant disease handbook for Paeonia.

ANTHRACNOSE. Gloeosporium sp., IL, KS, MD, MA, NJ, NC, PA, VA.
BACTERIAL Crown Gall. Agrobacterium tumefaciens, MD, MI.
BLIGHT, Early Bud Rot. Botrytis paeoniae, general.
BLIGHT, Late; Gray Mold. Botrytis cinerea, also leaf rot, general.
BLIGHT, Southern. Sclerotium rolfsii, MS, TX.
BLIGHT, Tip; Crown Rot. Phytophthora cactorum, CT, IL, IN, KS, NJ,
NY, OH.
BLOTCH, Leaf, Stem; Measles. Cladosporium paeoniae, general.
CANKER, Stem Wilt. Coniothyrium sp., CA on tree peonies.
LEAF SPOT. Alternaria sp., occasional in northeastern and central states;
Cercospora paeoniae, IL; Pezizella oenotherae, MD, PA; Phyllosticta
sp., NJ, PA, VA, Septoria paeoniae, also stem canker, ME, MI, MN, NJ,
NY, OR, RI, WA, WI; Cryptostictis paeoniae, IL.
NEMATODE, Leaf and Stem. Ditylenchus dipsaci, NJ, WA.
NEMATODE, Root Knot. Meloidogyne spp., widespread; M. hapla; M. in-
cognita.
NEMATODE, Spiral. Rotylenchus buxophilus.
NONPARASITIC. Bud Blast. Various causes, sometimes potassium deficien-
cy.
Le Moine Disease; Club Root. Cause unknown, possibly virus.
POWDERY MILDEW. Erysiphe polygoni, TX.
ROT, Root. Armillaria mellea, CA, IA, MI, OR; Fusarium sp., CO, IN,
MO, NE, NJ, OK; Phymatotrichum omnivorum, AZ, TX; Rhizocto-
nia solani, CT, IL, MN, NY, PA, VA; Thielaviopsis basicola, CT.
ROT, Stem; Wilt. Sclerotinia sclerotiorum, IL, MD, MN, NJ, NY, OH,
OK.
VIRUS. Peony Ring Spot, MA to VA, CA, KS, MI, WA.
VIRUS. Witches’ Broom, Crown Elongation. Cause unknown, MD, NY,
VA.
WILT. Verticillium albo-atrum, IL, KS, MD, NY, OH.
Botrytis blight is doubtless the best-known peony disease. Young shoots are
rotted at base; buds turn black, flowers are blasted. Cutting down all tops at
ground level in fall and spraying in spring when reddish shoots first show
will reduce blight. Anthracnose, blotch, sometimes leaf spot, may be seri-
ous occasionally. In humid summers Sclerotinia sclerotiorum frequently kills
stalks, filling the pith with very large sclerotia. Sickly plants may have root-
knot nematodes. Lack of bloom may be due to too-deep planting, growing in
shade, Botrytis blight, or nematodes.

On peony.
By: Daniel B. Wheeler (Tuberale)
2014-06-19 04:50:24 CEST (+0200)

Leaves not normally this color.

Doesn’t look like a rust or smut…
By: Byrain
2014-06-19 03:23:35 CEST (+0200)

Created: 2014-06-19 02:25:31 CEST (+0200)
Last modified: 2014-06-19 09:15:46 CEST (+0200)
Viewed: 60 times, last viewed: 2016-12-05 11:04:28 CET (+0100)
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