A honey bee will only work one kind of flower during a foraging trip. It may be that there isn't enough of the flower they are working to warrant calling out the troops. There may also be an abundance of something else that they are concentrating on in another area. I planted some buckwheat which is now in bloom I'd check early in the morning when the honeybees were first coming out and they weren't working it. I checked late in the day and there were no bees. The last few days I went out mid-morning and every kind of bee and wasp you can imagine was into the buckwheat. I then heard that it only produces nectar during a certain time of day. I think eventually, the bees will build up resistance to mites and be able to live with them.

Sounds good to me Tony, as my flowes increase, on a daily basis I notice more honey bees, there were 7 or 8 today! very nice to see.\
Cheers