Guignardia aesculi (Peck) V.B. Stewart
(Horse Chestnut Leaf Blotch - causative organism)

Interactions where Guignardia aesculi is the dominant partner and gains from the process

The following relationships have been collated from the published literature (see 'Interaction References').

Stage		Summary			Taxon	Vernacular	Classification	References	Darwin Classification of Active Taxon	Active Taxon	Active Vernacular	Active Taxon Uncertain	Active State	Active Part	Active Stage	Relationship	Relationship Uncertain	Relationship Geography	Darwin Classification of Passive Taxon	Passive Taxon	Passive Vernacular	Passive Taxon Uncertain	Passive State	Passive Part	Passive Stage	Passive Taxon's significance to Active Taxon	Indoors etc	Season
Phyllosticta coelomycetous anamorph (epiphyllous, scattered or crowded)		epiphyllous, scattered or crowded pycnidium of Phyllosticta coelomycetous anamorph causes spots on live leaf			Aesculus	horse chestnuts	Sapindales: Sapindaceae	Pests, Diseases & Disorders of Garden Plants, Buczacki, S. & Harris, K., 1998	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism		epiphyllous, scattered or crowded	pycnidium	Phyllosticta coelomycetous anamorph	Foodplant / spot causer		UK and/or Eire	/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus/	Aesculus	horse chestnuts		live	leaf
pseudothecium		pseudothecium is saprobic on dead, fallen, over-wintered leaf			Aesculus	horse chestnuts	Sapindales: Sapindaceae	Pests, Diseases & Disorders of Garden Plants, Buczacki, S. & Harris, K., 1998	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism				pseudothecium	Foodplant / saprobe			/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus/	Aesculus	horse chestnuts		dead, fallen, over-wintered	leaf				(5)
Phyllosticta coelomycetous anamorph (epiphyllous, scattered or crowded)		epiphyllous, scattered or crowded pycnidium of Phyllosticta coelomycetous anamorph causes spots on live leaf			Aesculus glabra		Sapindales: Sapindaceae	Guignardia leaf blotch of Horsechestnut, Hudson, H.J., 1987	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism		epiphyllous, scattered or crowded	pycnidium	Phyllosticta coelomycetous anamorph	Foodplant / spot causer			/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus glabra/	Aesculus glabra			live	leaf				(7-)
pseudothecium		pseudothecium is saprobic on dead, fallen, over-wintered leaf			Aesculus glabra		Sapindales: Sapindaceae	Guignardia leaf blotch of Horsechestnut, Hudson, H.J., 1987	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism				pseudothecium	Foodplant / saprobe			/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus glabra/	Aesculus glabra			dead, fallen, over-wintered	leaf				(5)
Phyllosticta coelomycetous anamorph (epiphyllous, scattered or crowded)		epiphyllous, scattered or crowded pycnidium of Phyllosticta coelomycetous anamorph causes spots on live leaf			Aesculus hippocastanum	Horse Chestnut, Horse-chestnut	Sapindales: Sapindaceae	Pests, Diseases & Disorders of Garden Plants, Buczacki, S. & Harris, K., 1998 Microfungi on Land Plants: An Identification Handbook, Ellis, M.B. & J.P., 1997 Guignardia leaf blotch of Horsechestnut, Hudson, H.J., 1987	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism		epiphyllous, scattered or crowded	pycnidium	Phyllosticta coelomycetous anamorph	Foodplant / spot causer		UK and/or Eire	/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus hippocastanum/	Aesculus hippocastanum	horse chestnut, horse-chestnut		live	leaf		Major		(7-)
pseudothecium		pseudothecium is saprobic on dead, fallen, over-wintered leaf			Aesculus hippocastanum	Horse Chestnut, Horse-chestnut	Sapindales: Sapindaceae	Microfungi on Land Plants: An Identification Handbook, Ellis, M.B. & J.P., 1997 Guignardia leaf blotch of Horsechestnut, Hudson, H.J., 1987	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism				pseudothecium	Foodplant / saprobe		UK and/or Eire	/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus hippocastanum/	Aesculus hippocastanum	horse chestnut, horse-chestnut		dead, fallen, over-wintered	leaf		Major		(5)
Phyllosticta coelomycetous anamorph (epiphyllous, scattered or crowded)		epiphyllous, scattered or crowded pycnidium of Phyllosticta coelomycetous anamorph causes spots on live leaf			Aesculus parviflora	Bottlebrush Buckeye, Red Buckeye	Sapindales: Sapindaceae	British Stem- and Leaf- Fungi: Coelomycetes Vol. I … Sphaeropsidales with hyaline conidia, Grove, W.B., 1935 Guignardia leaf blotch of Horsechestnut, Hudson, H.J., 1987	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism		epiphyllous, scattered or crowded	pycnidium	Phyllosticta coelomycetous anamorph	Foodplant / spot causer		UK and/or Eire	/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus parviflora/	Aesculus parviflora	bottlebrush buckeye, red buckeye		live	leaf				(7-)
pseudothecium		pseudothecium is saprobic on dead, fallen, over-wintered leaf			Aesculus parviflora	Bottlebrush Buckeye, Red Buckeye	Sapindales: Sapindaceae	Guignardia leaf blotch of Horsechestnut, Hudson, H.J., 1987	/Fungi/Ascomycota/Dothideomycetes/Botryosphaeriales/Phyllostictaceae/Guignardia aesculi/	Guignardia aesculi	horse chestnut leaf blotch - causative organism				pseudothecium	Foodplant / saprobe			/Plantae/Tracheophyta/Magnoliopsida/Sapindales/Sapindaceae/Aesculus parviflora/	Aesculus parviflora	bottlebrush buckeye, red buckeye		dead, fallen, over-wintered	leaf				(5)

Author & Year	Title	Source
Buczacki, S. & Harris, K., 1998	Pests, Diseases & Disorders of Garden Plants	Collins Photoguide, 2nd edition edition, Collins
Ellis, M.B. & J.P., 1997	Microfungi on Land Plants: An Identification Handbook	2nd (New Enlarged) edition, 868pp, The Richmond Publishing Co. Ltd
Grove, W.B., 1935	British Stem- and Leaf- Fungi: Coelomycetes Vol. I … Sphaeropsidales with hyaline conidia	Vol I, 488pp, Cambridge University Press
Hudson, H.J., 1987	Guignardia leaf blotch of Horsechestnut	TBMS Vol 89 (3): 400-401.

Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism) may also be included in 'feeds on' relations listed under the following higher taxa:

FUNGI
(true fungi)

Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism) may be included in 'fed on by' relations listed under the following higher taxa:

FUNGI
(true fungi)

Lichenes
(lichens)

Fungi s.l.
(fungi (in the broad sense))

Taxonomic hierarchy:

Species	Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism)
Genus	Guignardia (a genus of ascomycete fungi)
Family	PHYLLOSTICTACEAE (a family of fungi)
Order	BOTRYOSPHAERIALES (an order of ascomycetes)
Class	DOTHIDEOMYCETES (a class of ascomycetes)
Subphylum	PEZIZOMYCOTINA (a subphylum of ascomycetes)
Phylum	ASCOMYCOTA (spore shooters, ascomycete)
Kingdom	FUNGI (true fungi)
Domain	Eukaryota (eukaryotes)
Life	BIOTA (living things)

Guignardia aesculi is also a member of:
Lichenes - lichens (via Botryosphaeriales)
Micromycetes - microfungi (via Ascomycota)
Fungi s.l. - fungi (in the broad sense) (via Fungi)
Lower Plants - lower plants (via Fungi s.l.)

NBN

NBN (data.nbn.org.uk) has a distribution map for Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism)

Identification Works

Handling & Magnification	Author	Year	Title	Source
	Forest Research	2007	Path News Issue 15: October 2007
	Forest Research	2004	Path News Issue 8: July 2004
	Hudson, H.J.	1987	Guignardia leaf blotch of Horsechestnut	TBMS Vol 89 (3): 400-401.
	Punithalingam, E.	1993	Guignardia aesculi	I.M.I. Descriptions of Pathogenic Fungi and Bacteria CMI Descriptions of Pathenogenic Fungi and Bacteria Sheet 1165.

Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism) may also be included in identification literature listed under the following higher taxa:

DOTHIDEOMYCETES
(a class of ascomycetes)

ASCOMYCOTA
(spore shooters, ascomycete)

FUNGI
(true fungi)

Eukaryota
(eukaryotes)

BIOTA
(living things)

Lichenes
(lichens)

Fungi s.l.
(fungi (in the broad sense))

Literature listed under the following higher taxa may be relevant to Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism):

DOTHIDEOMYCETES
(a class of ascomycetes)

ASCOMYCOTA
(spore shooters, ascomycete)

FUNGI
(true fungi)

Eukaryota
(eukaryotes)

BIOTA
(living things)

Lichenes
(lichens)

Fungi s.l.
(fungi (in the broad sense))

BioImages

BioImages (www.bioimages.org.uk) has 67 images of Guignardia aesculi (Horse Chestnut Leaf Blotch - causative organism)

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