I'm not certain, but it looks unpleasantly like it. I've taken off the dubious foliage and put in in a dalek. We'll see. Meanwhile, on a pleasanter note, the beans are finally showing signs of growth.
I had a look at the bees, and finally found and marked the swarm queen. She's a great fat, dark thing, and as always she left me wondering how on earth I managed to miss her for so long. The other hive has most of the bees down below, where I wanted them, with a suffient number in the top broodbox. The new queens should have hatched by now, and they were taking in loads of pollen. There won't be a mated queen yet, but pollen going in is usually a sign that all's well.