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A Year of Plant Pathogens

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3^rd April 2023

Puccinia tumida on Conopodium majus from Rowallane, Down. This is the first Ulster record since 1947, and the first Irish record since 1993.

2^nd April 2024

Coleosporium sonchi on Sonchus sp. in the Annalong Valley.

Also seen:

• Albugo hohenheimia on Cardamine sp.
• Albugo candida s.s. on Capsella bursa-pastoris

3^rd April 2024

Synchytrium taraxaci on Taraxacum sp. in the Lagan Valley.

Uromyces ficariae on Ficaria verna in the Lagan Valley.

Puccinia malvacearum on Malva sp. in the Lagan Valley.

Also seen:

• Entyloma ficariae on Ficaria verna

4^th April 2024

Synchytrium taraxaci on Taraxacum sp. in the Lagan Valley.

6^th April 2024

Albugo candida on
a) Sisymbrium officinale
b,c) Cochlearia danica and
d) Raphanus raphanistrum subsp. maritimum
in Belfast.

Pustula senecionis on Senecio vulgaris in Castlereagh, Belfast. This genus is new to Ulster. The plant was also infected by Puccinia lagenophorae, though it is not visible in the photograph.

Peronospora ficariae on Ficariae verna in Ormeau Park, Belfast. Note how the infection has progressed from last month, from brownish white down to a darker brown.

Also seen:

• Uromyces hyacinthi on Hyacinthoides sp.

7^th April 2024

Pucciniastrum epilobii on Epilobium sp. in Castlereagh.

Puccinia sessilis on Arum maculatum in Ballymorran.

Also seen:

• Synchytrium taraxaci on Taraxacum sp.
• Entyloma ficariae on Ficaria verna

9^th April 2024

?Ramularia galii on Galium aparine in North Down. If the ID is correct this is new to Ireland.

Mycosphaerellaceae sp. on Escallonia sp. in North Down. New to Ireland. Note both Septoria escalloniae and Mycosphaerella escalloniae are known from this host, and can only be distinguished microscopically.

10^th April 2024

Mycosphaerellaceae sp. on Escallonia sp. in Ballygilbert, North Down. This may be the same as the one above.

11^th April 2024

Seen in the Lagan Valley:

• Aecidium ficariae on Ficaria verna
• Aecidium ranunculi-acris on Ranunculus acris
• Entyloma eburneum on Ranunculus repens
• Entyloma microsporum on Ranunculus repens
• Golovinomyces cichoracearum on Lapsana communis
• Kuehneola uredinis on Rubus fruticosus agg.
• Peridermium oblongisporum on Pinus sp.
• Peronospora aparines on Galium aparine
• Peronospora ficariae on Ficaria verna
• Peronospora hiemalis on Ranunculus acris
• Peronospora ranunculi on Ranunculus repens
• Plasmoverna pygmaea on Anemone nemorosa
• Septoria aegopodii on Aegopodium podagraria

Seen in East Belfast:

• Albugo candida agg. on Erophila verna agg.

12^th April 2024

Albugo leimonios on Cardamine pratensis in the Lagan Valley. New to Ireland.

Entyloma fumariae on Fumaria sp. in the Lagan Valley. New to Ireland.

Also seen in the Lagan Valley:

• Aecidium ficariae on Ficaria verna
• Entyloma ficariae on Ficaria verna
• Entyloma eburneum on Ranunculus repens
• Entyloma microsporum on Ranunculus repens
• Peronospora ficariae on Ficaria verna
• Peronospora hiemalis on Ranunculus acris
• Plasmopara nivea on Heracleum sphondylium
• Puccinia lapsanae on Lapsana communis
• Puccinia sessilis on Arum maculatum
• Puccinia tumida on Conopodium majus
• Synchytrium taraxaci on Taraxacum agg.
• Uromyces ficariae on Ficaria verna
• Uromyces hyacinthi on Hyacinthoides non-scripta

13^th April 2024

Seen in East Belfast:

• Albugo hohenheimia on Cardamine sp.
• Entyloma microsporum on Ranunculus repens
• Pustula senecionis on Senecio vulgaris

15^th April 2024

Seen in East Belfast:

• Albugo leimonios on Cardamine pratensis
• Entyloma ficariae on Ficaria verna
• Golovinomyces asperifolii on Myosotis arvensis
• Peronospora aparines on Galium aparines
• Peronospora hiemalis on Ranunculus acris
• Pustula senecionis on Senecio vulgaris

16^th April 2024

Urocystis ranunculi on Ranunculus repens in Rowallane.

Also seen in Rowallane:

• Urocystis ranunculi on Ranunculus repens
• Puccinia tumida on Conopodium majus

Seen in East Belfast:

• Albugo leimonios on Cardamine pratensis