are they slightly risque pictures? - encouraging the hornets to beat themselves to a standstill?
Many of specimens in your pic seem to be Euro hornets or wasps, judging by the number of yellow abdomen stripes.
These might stop the hornets getting the bees on the way in, but there's nothing to stop them using the devices as a perch until a bee comes out then 'hawking' it.
If there is heavy AH predation, without muzzles the bees hang on the front of the hive, they won't forage, they get stressed and eat through their stores. With the muzzles they continue to forage, they are less stressed, the queen lays as normal. It's a de-stressor which improves the colonies chance of survival.
As per YouTube these look to work well and are selective. But they are made to fit a Nutella jar and the thread & size is not that common here. There are ones to suit UK sizes as free to use 3D printer design files available if you have a printer. If you do not have a 3D printer or access to one they are available from Marsh Apiaries. This type are for general trapping through the year. We ([email protected]) have a version designed for spring Queen trapping, the entrance and escapes holes are resized to maximise the chances of catching an AH Queen and allow as much bycatch to escape without releasing the AH Queen. They are smaller (not intended for large quantities of workers) and will fit on a typical 1lb jam jar. We estimate that we will be able to sell these at £1.00 each + postage. Asian Hornet Alert are a non profit community group/club set up to fight or manage the Asian Hornet problem, open to all, Beeks, non-beeks and other groups.
Yes have watched his Youtube, I am sure the one Richard recommends the "Jabeprode" are good, since there are now many options out there its looking at the best and also the cheapest. As not all beekeepers will buy traps that will cost about £100 for each trap.
