We hung one of the new bee hotels within easy site of the patio so that we could watch the bees come and go: imagining relaxing as we sipped our coffee. For the naturally curious it doesn’t quite work out like that.
Take a warm sunny day in May, the temperature has reached 30 degrees C, then everything shoots into action with the bees. The Osmia cornuta had blocked up eight bamboo rods and I was getting ready to do a blog on how things had gone.
Then a bee arrives but it is not Osmia cornuta and it has attached something to the bamboo.
Leaving her nest exposed, what looked like a cuckoo bee arrived and some little flies were also hanging around, one is just above the head of the black and yellow guy.
I always think of little fruit flies as harmless but a fly – Cacoxenus indagator – is a parasite of the mason bees. There is a very interesting New Scientist article on Cacoxenus indagator and they look suspiciously like these flies.
The mason bee seems oblivious to the danger and continues on her masonry business.
I found the behaviour of the bees peculiar as I had read that they often chased off cuckoo bees that approached their nest sites. It is now six minutes since the little packet has been hanging on the end of the bamboo cane.
Osmia rufa have yellow ventral bristles called scopae so this could be an indication of the species of these bees but the photographs are not too clear.
This shows the yellow ventral brushes better but was taken later than the following pictures.
The packet has now been stuck into the centre of the bamboo, eleven minutes after being brought back.
It took another five minutes of work until she was finally satisfied with the finished job and that meant borrowing some mortar from the neighbouring hole. Excuse me, madam, but that hole has been in place since the 15 April and you were not around at this time. This leads me to the accusation that you are purloining the mortar of an Osmia cornuta. I’m not sure whether the plea that you are tired and need a break is a good enough excuse.
It is not far for them to go to the Star of Bethlehem flowers (Ornithogalum umbellatum) to recharge their energy levels with some nectar.
One thing is sure cuckoo bees don’t build nests and it is just what this one appeared to be doing. I think I can see a clutch of eggs in the hole.
This is no Nomada bee but a potter wasp, probably Ancistrocerus sp. and perhaps Ancistrocerus auctus.
In this case it would be no particular threat to the mason bees as there was plenty of room for everyone so that would explain their lack of concern for the black and yellow visitor.
There were more surprises on the way for up until now no-one had shown any interest in the holes in wood on the lower log. Then along came one of my favourite bees.
She had caused me a lot of problems to identify as she is a light form not like her ginger sisters in the UK. They also nest in the house wall at the back and nectar on the Cerinthe in the front garden but more about them later.
Needless to say I was happy to see them trying out the bee house for size.
I’m not sure what she is doing here. Perhaps removing some of the sawdust but when they nest in the walls they tend to kick out the dust with their feet.
Anyway it was a very exciting day. The photographs were much poorer than I had hoped for but the nest is too high for me to hold the camera and avoid trampling on the border underneath. We erected it for the bees not thinking sufficiently about photographing them.
I checked on the state of play later in the evening at eight p.m. and was surprised to see the wasp still there.
There are now twelve bamboo canes blocked up but the cane the potter wasp blocked up, is identical to my eye to the ones the bees have closed up. This is the first visit from the wasp that I have noticed so I presume this is her first nest in the hotel, but perhaps not the last. The wasps are carnivorous and supply their nests with grubs and caterpillars.
So it looks like I may have a pest disposal and pollinating service working side by side!