The recovery test from #Berberis vulgaris to the presumed primary host, #Arrhenatherum elatius, was also successful 🥰, confirming the id of the #rust as #Puccinia arrhenatheri: pustules appeared on the upper leaf face and were larger than those of P. graminis (30–34 × 26–28 µm).
The recovery of #Puccinia graminis from aecia on #Berberis is nearing completion, with 36 samples collected in 2026 tested on a dozen grass and cereal species. Third year of data for Alicia Culot's PhD thesis, providing valuable information on primary hosts and formae speciales.
First 2026 sampling day for stem #rust (#Puccinia graminis) on barberry (#Berberis vulgaris) around Dijon. On the Chenôve plateau, the aecia are already showing up!
Fantastic diversity of shapes of #Puccinia graminis aecia, likely influenced by developmental stage, resistance level of #Berberis vulgaris, inoculum pressure, weather conditions at infection, and formae speciales (around Dijon, France). But can you identify the intruder? 🤔
