Septoria host plants – targets of this ravaging leaf spot disease

Septoria has often caused many a gardener to wail in desperation. What plants does it affect? Where is it hiding over winter?

This list shows most common plants which are affected by the Septoria fungus. When they exist, common names as well as scientific names for the disease are included. They’re also called Septoria leaf spot“, too.

It’s a complement to our main Septoria leaf spot page. We describe there exactly how you can save your harvest and flowers from this rampaging fungal leaf spot. Information for correct septoria identification is included, too.

Different species of Septoria fungus

Over 500 species of Septoria have been described. Experts estimate that over a thousand may exist in all. Most of them must still be discovered and described!

Here are a few different types of Septoria and the plants they infect. Together, they’re called “host plants for Septoria“.

For any given septoria fungus, however, contamination will usually only occur from plants that can host that same species exactly.

Host plants for Septoria

Click here for shortcuts to the tables on this page:

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Food crops & vegetables Septoria infects

PlantScientific nameCommon name
tomato
eggplant
Physalis
bell & chili pepper
Septoria lycopersicitomato black spot
tomato septoria
tomato leaf spot
eggplant leaf spot
potatoSeptoria lycopersici
var. malagutii
annular leaf spot
celery
celeriac
Septoria apiicolalate blight
squash
melon
cucumber
pumpkin
butternut
red kuri
watermelon
other
Cucurbitaceae
Septoria
cucurbitacearum
leaf spot
lettuceSeptoria lactucae
lettuce leaf spot
strawberrySeptoria fragariae
Septoria aciculosa
leaf spot, hard rot
red beetSeptoria betaebeet leaf spot
peaSeptoria pisi
soybeanSeptoria glycinesbrown spot
wheatSeptoria tritici
Septoria nodorum
leaf blotch

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Fruit trees Septoria uses as hosts

PlantScientific nameCommon name
Pear treeSeptoria piricola
also written
Septoria pyricola
White spot
Pecan treeSeptoria caryae
Apple treeSeptoria sp.White spot
Most vulnerable:
Lemon tree
Orange tree (Valencia)
Grapefruit tree
Navel oranges
Least vulnerable:
Buddha’s Hand
Finger lime
Calamondin
Kumquat
Septoria citriSeptoria spot
HazelnutSeptoria ostryaeHazelnut Septoria
Blackberry
and raspberry
Septoria rubi
renamed to
Sphaerulina westendorpii
Blackberry leaf spot
Kiwi
(Actinidia)
Septoria actinidiaekiwi leaf spot
Chestnut treeSeptoria castaneicolachestnut leaf spot
Cherry treeSeptoria sp.cherry leaf spot
blueberry,
cranberry,
and bilberry
and others of the
Vaccinum family
Septoria albopunctataBlueberry septoria

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Ornamental plants infected by Septoria

PlantScientific nameCommon name
CyclamenSeptoria cyclaminiscyclamen leaf spot
PhloxSeptoria divaricata
Septoria phlogis
phlox leaf spot
LavenderSeptoria lavandulaelavender leaf spot
RudbeckiaSeptoria rudbeckiaeRudbeckia leaf spot
HydrangeaSeptoria hydrangeaeHydrangea leaf spot
Passion flowerSeptoria passifloraepassiflower leaf spot
Bellflower (Campanula)Septoria campanulaebellflower leaf spot
Carnation (Dianthus)Septoria dianthicarnation leaf spot
Helianthus
(sunflower)
Septoria helianthiHelianthus leaf spot
Asteraceae
(Asters)
including
Chrysanthemum
Oxeye daisy
Marigold
Septoria leucanthemi
Septoria coelomycetous
Septoria chrysanthemella
Septoria chrysanthemi
Septoria obesa
Septoria adanensis
Septoria socia
Aster leaf spot
Impatiens
(including
Sunpatiens)
Septoria sp.Impatiens leaf spot
Hebe
(Veronica)
Septoria veronicaeVeronica leaf spot
Gerbera
& possibly Garvinea
Septoria gerberaeGerbera leaf spot
FlaxSeptoria linicolaFlax leaf blotch
Dead-nettleSeptoria lamiiDead-nettle leaf spot
MallowsSeptoria malvicolaSeptoria leaf spot
ClematisSeptoria clematidisClematis leaf spot

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Leaf fungus infecting Azalea, one of the septoria plants

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Trees and hedge shrubs Septoria may infect

PlantScientific nameCommon name
barberrySeptoria berberidis
barberry leaf septoria
Azalea
including
Azalea japonica
Septoria azaleae
Septoria azalea-indicae
Azalea leaf spot
MagnoliaSeptoria sp.Magnolia septoria spot
Rhododendron
including R. minus
Septoria rhododendri
Septoria albopunctata
Septoria azaleae
Septoria azaleae-indicae
Septoria oleandrina (=S. nerii)
Septoria solitaris
Rhododendron leaf spot
poplar,
willow
Septoria populicola
Septoria musiva
(renamed to
Sphaerulina musiva)
poplar blight
cherry laurelSeptoria laurocerasicherry laurel septoria
birchSeptoria betulaebirch leaf septoria
dogwoodSeptoria cornicoladogwood septoria
Lantana camaraSeptoria lantanifoliiLantana leaf blotch
gorseSeptoria slaptoniensisgorse leaf spot septoria
oakSeptoria quercicola
oak leaf septoria
silverberry
Russian olive
Septoria elaeagniElaeagnus septoria
plane treeSeptoria platanifoliaplane leaf septoria
hophornbeamSeptoria sp.
hophornbeam leaf septoria
ashSeptoria sp.
ash leaf septoria
oleanderSeptoria oleandrina
Septoria nerii
oleander leaf septoria
holly
(note: yaupon is resistant)
Septoria ilicifoliaholly leaf septoria
hawthornSeptoria oxycanthae
hawthorn leaf septoria

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Herbs and spices hosting Septoria

PlantScientific nameCommon name
lemon balmSeptoria melissaelemon balm leaf spot
parsley
coriander
Septoria petroseliniparsley blight
verbenaSeptoria verbenaeVerbena leaf spot
Allium tuberosum
(garlic chives)
Septoria alliiSeptoria leaf spot
SteviaSeptoria steviaStevia leaf spot
hopsSeptoria humulihops Septoria
mintSeptoria menthaemint leaf spot
Sichuan pepperSeptoria pachyspopraSichuan leaf spot
MertensiaSeptoria poseyiMertensia leaf spot

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Weeds Septoria survives and multiplies on

Find the most common Septoria host weeds in the main article here.


Credits for images shared to Nature & Garden (all edits by Gaspard Lorthiois):
Dogwood infected with septoria by Jerzy Opioła under © CC BY-SA 4.0
Azalea septoria specimen by Jerzy Opioła under © CC BY-SA 4.0