We're still being plagued by wasps attacking our bumble nest even though the brush on the beepol hive is preventing some of them getting in; some of them are smart (or at least persistent) enough to break through and find away in.
We hastily tried a plastic flap stuck to the box and very quickly reversed that decision as it was clear it wasn't fit for purpose.
The key issue is that the entrance hole on the lodge is set back from the resting ledge and tucked under the roof, close to the side; there's no space to create anything sophisticated.
So, at the weekend I decided to try a design that extended the hole (using is wedge of wood with a hole drilled through it) and stick the flap to that. It worked a lot better, and certainly kept the wasps out, but so too all the bees had a bit of trouble with it: in most cases we ended up helping them in and out. I didn't want to take any risks over them failing to get in and then deserting the nest.
So, tonight I began my third attempt. This time the plan was to build a complete fascia to mount onto the lodge, with a tube to the entrance behind the fasica, and then an entrance vestibule with sloping (i.e. gravity powered) plastic flap. It was quite a lengthy process to build, just from cardboard and some plastic cut out from packaging. Here's what I built:
We tested it tonight - and although the fit is good, we discovered the first problem: it's useless in the wind! Flapping wildly, a brave wasp managed to easily get inside the nest (although heaven knows why it was out in such inclement weather).
So, wracking the brains for the next design..