Frédéric Suffert

Early root-root interactions weaken foliar defense responses against Septoria tritici blotch in a durum wheat varietal mixture https://www.biorxiv.org/content/10.1101/2025.07.30.667709v1

Assistant Professor: Population and Disease Dynamics of Cereal Pathogens The Department of Botany & Plant Pathology invites applications for a full-time (1.00 FTE), 9-month, tenure track Assistant Professor: Population and Disease Dynamics of Cereal Pathogens position.We a...

Come join me at Oregon State! We’re hiring a new assistant professor in population and disease dynamics of cereal pathogens. Our department is dynamic and fun, our building is newly renovated, and Oregon is wonderful! jobs.oregonstate.edu/postings/171...

#Rust on lesser pond sedge (#Carex acutiformis) caused by #Puccinia urticata var. urticae-acutiformis ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

#Rust on water mint (#Mentha aquatica) caused by #Puccinia menthae, with some orange larvae of Mycodiplosis sp. feeding on uredinia ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

No, I have not seen paraphyses of this type

Crown #rust on common velvet grass (#Holcus lanatus) caused by #Puccinia coronata f. sp. holci ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

#Rust on tussock grass (#Deschampsia cespitosa) caused by #Puccinia sp. — likely P. deschampsiae rather than P. coronata — hyperparasitized by Sphaerellopsis sp. ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

Stem #rust on crested dog's-tail (#Cynosurus cristatus) caused by #Puccinia graminis ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

#Rust of false helleborine (#Veratrum album) caused by #Puccinia veratri ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

Stem #rust on false oat-grass (#Arrhenatherum elatius) caused by #Puccinia graminis ('Tourbière des Rauzes', Saint-Laurent-de-Lévézou, FR).

Peat bog 'Tourbière des Rauzes' à Saint-Laurent-de-Lévézou (#Aveyron, FR).

Septoria leaf spot on common centaury (#Centaurium erythraea) likely caused by #Septoria erythraeae, found in the tiny old cemetery of Notre-Dame du Désert overlooking the "Raspes du Tarn" (Verdalle, FR).

(5/5) ... finally complemented by the latest report in Germany by @ruhrpottpilze.bsky.social!
➡️ bsky.app/profile/ruhr...

(4/5) ... a third one in the Netherlands by
@erikslootweg.bsky.social on X...
➡️ x.com/erikslootweg...

(3/5) ... a second identification in East of France in 2021 by @pascal-frey.bsky.social, repeated again yesterday (!)...
➡️ bsky.app/profile/pasc...

(2/5) This paper is the result of multiple collaborative reports of this rust fungus on the platform X (formerly Twitter), following an initial identification near my home in Les Clayes-sous-Bois during ‘phytopathological strolls’ in 2020...
➡️ bsky.app/profile/whea...

(1/5) Happy to share our latest paper "#Uromyces plumbarius first reported on Oenothera lindheimeri in Europe with widespread distribution and association with two common natural enemies of rust fungi". Thanks @pascal-frey.bsky.social, K Meyer & @erikslootweg.bsky.social!
doi.org/10.1007/s106...

#Smut fungus on erect brome (#Bromus erectus) – here malformed and sterile – caused by #Tranzscheliella hypodytes (syn. #Ustilago hypodytes), with stems inside the leaf sheaths covered by dense masses of very small, dark brown spores, measuring 5–6 × 4–5 µm (Millau, FR).

Stem #rust on false oat-grass (#Arrhenatherum elatius) caused by #Puccinia graminis (Millau, FR).

#Rust on false oat-grass (#Arrhenatherum elatius) caused by #Puccinia coronata (Millau, FR).

#Smut fungus on barren brome (#Bromus sterilis) caused by #Ustilago bullata (Millau, FR).

'Tar spot' on couch grass (#Elymus repens) caused by #Phyllachora graminis (Aguessac, FR).

The range of the key oversummering regions of #Puccinia striiformis f. sp. tritici in northwestern #China has expanded westward doi.org/10.1094/PHYT...

Shapes and hues — orange, brown, black on green — vivid or blending, silken, bristly, sharp, often powdery... Let us wager that the phenotypic & genotypic diversity of #Puccinia graminis on wild (mostly) and cultivated #grasses (less ) is locally as rich as symptoms 🤩.

Two months after the survey on #Berberis vulgaris, a return to Burgundy near #Dijon with Alicia and Ulysse to search for stem #rust on wild #grasses and possibly on cultivated cereals growing along the edges.

#Rust on field milk thistle (Sonchus arvensis) caused by #Coleosporium sonchi, grazed by Mycodiplosis sp. larvae (Bellême, FR).

#Rust of meadow starwort (Stellaria palustris) caused by #Puccinia arenariae (Manoir de Courboyer, Perche-en-Nocé, FR).

#Rust on broad-leaved enchanter's nightshade (Circaea lutetiana) caused by #Pucciniastrum circaeae (Bellême, FR).

#Rust on mock strawberry (Potentilla indica) caused by #Phragmidium mexicanum syn. #Frommeëlla mexicana (Bellême, FR).

#Rust of small cow-wheat (Melampyrum sylvaticum) caused by #Coleosporium melampyri (Bellême, FR).