Hello All Ruary Rudd asks about Copper Gluconate. I have obtained a list of beekeeper users from the UK supplier Copper Gluconate (not Copper Sulphate) is supplied by "Bickerstaffes Honey Ltd" <[log in to unmask]> I have a good report on this product from a beekeeper in Lyme Regis in Dorset and I am presently following up other beekeepers in the UK whose names I have been given by Bickerstaffes. Some posts to the Irish Beekeeping List cast doubts on the efficacy of the product, so I suppose the motto should be 'use with a low mite count to begin with, and with continuous monitoring, and be prepared to nuke the mites with an acaricide if the mite count gets too high' Sincerely Tom Barrett