Hi, many years ago I photographed bees on dandelions. Finding the right moment is not easy, but observing the behavior of insects can help.
I noticed that just before taking off, the bee cleans the pollen out of its eyes with its front legs. In this way I was able to anticipate the shot and freeze the action.
Before I had many shots without bees, this way you get good pictures.
Nikon D80 micro-nikkor 60mm @ f25 1/200s 100 ISO - flash SB400
Ezio