Uromyces viciae-fabae, Broad bean rust
Together with my allotment, I inherited a few crops sown by the previous tenant, one of these being broad beans (Vicia faba). As the plot had laid abandoned for a while, the plants had suffered from the period of drought we experienced earlier this summer so weren’t doing particularly well at the point I took over, but I tried to revitalise them with abundant water and fertiliser. It seemed to work, as they started flowering again and I even got to harvest one single pod, but it was already getting late in their productive season, and shortly after the first signs of broad bean rust started becoming evident, so I ended up cutting them down and disposing of them.
This particular fungal disease affects only this species, and tends to overwinter as hardy spores in the soil, so I will avoid growing broad beans again, at least in the same raised bed. It can be controlled with fungicides during its early stages, but using resistant cultivars is the best practice, and plants are more likely to be affected towards the end of their cycle anyway.