#Rust on Berberis vulgaris caused by #Puccinia arrhenatheri - 🤩 Eureka! - here with dense coverage of aecidia (Chenôve, FR). The mycelium hibernates in the branches and the infection is systemic, inducing witches' brooms.

Pleased to announce our South African plant #rust image repository epidemiologiaufv.shinyapps.io/plantrustimage… on the International Day of Plant Health 2024. Thanks Emerson Del Ponte Emerson Del Ponte, Lisa Rothmann Lisa Rothmann, and Willem Boshoff Willem Boshoff for reviving our photographs.
#IDPH

#Rust on kikuyu grass ( #Pennisetum clandestinum, syn. #Cenchrus clandestinus) caused by #Phakopsora apoda (syn. #Angiopsora apoda). Paraphyses are abundant and a hyperparasite fairly common. From Onrus River, Western Cape, ZA.

🌿 Very exciting job opportunity !
EPPO is seeking a Scientific Officer (P2) to work (with me!) on Information Services in Paris.
If you're passionate about #planthealth and have expertise in #horizonScanning , apply by June 10th. Details & application: jobs.eppo.int/p2info

Celebrating #PlantHealthDay 2024 with a core selection for an ideal library. If I were to keep only four books that combine utility & pleasure of possessing witnesses to rusts history, these would be them: Gaumann, Viennot-Bourgin, Klenke & Scholler, and Kruse. And yours?

A photo confirming that the pycnia of #Puccinia graminis produce an attractive nectar for dipterans (Val Suzon, France).

Timing parfait pour la collecte d'écidies de #Puccinia graminis 👌🏻 (Val Suzon, FR). Ouvertes ou fermées, elles sont toujours un plaisir pour les yeux ! 😍

At the aecidial stage, the same stem #rust pustules on Berberis vulgaris become a festive meal for other small dipterans, here #Mycodiplosis sp. larvae (Chenôve, FR).

Yellow #rust on cock's-foot ( #Dactylis glomerata) likely caused by #Puccinia striiformoides syn. P. striiformis var. dactylidis (Les Clayes-sous-Bois, FR).

Early attack of stem #rust on tall fescue ( #Lolium arundinaceum) caused by #Puccina graminis (Les Clayes-sous-Bois).

#Rust of red #clover ( #Trifolium pratense) caused by #Uromyces sp., here with urediniospores and teliospores (Les Clayes-sous-Bois, FR). I suspect U. fallens rather than U. trifolii-repentis, but the disctinction is difficult.

#Rust on wooly buttercup ( #Ranunculus lanuginosus) whose identification is limited to #Aecidium ranunculi-acris, here with aecia on leaves and stems (Les Clayes-sous-Bois, FR).

Yellow #rust on common meadow-grass ( #Poa pratensis) caused by #Puccinia pseudostriiformis (Les Clayes-sous-Bois, FR). Thanks mehrdad for the in identification 🙏🏻.

#Rust of common #dandelion ( #Taraxacum officinale) caused by #Puccinia taraxaci (Les Clayes-sous-Bois, FR).

#Rust of southern wood-rush ( #Luzula forsteri) caused by #Puccinia sp. - likely P. obscura rather than P. luzulae (Les Clayes-sous-Bois, FR).

#Rust of common comfrey ( #Symphytum officinale) caused by #Melampsorella symphyti (Les Clayes-sous-Bois, FR).

#Rust of groundsel ( #Senecio vulgaris) caused by #Puccinia lagenophorae (Les Clayes-sous-Bois, FR). This pathoystem is so common in pavements & wasteland that I no longer look at it... except today, to see first telia - not so frequent - here in the middle of aecia!

Spotted at Luxembourg Airport today.
#DontRiskIt

Ke Zhang mononucleate germination and dikaryotic aeciospores suggests selfing in autoecious Cronartium pini

The workshop 'Rust fungi in forests and agriculture' takes place today to celebrate Berit Samil's long research career. A great day of talks, discussions and networking around rust diseases. We wish you a great retirement, Berit!