The cause or causes, proximate or ultimate, of the ongoing problem of Colony Collapse Disorder are still contested, but a toxicologist ought to have a useful insight into the matter. So the fact that Dr Henk Tennekes has weighed the evidence and considers that neonicotinoid pesticides are to blame, has to be taken seriously. You'd hope. Their use has already been suspended in several countries, with positive results for domestic bee populations
His recent book on the subject is comfortingly titled "The Systemic Insecticides: a Disaster in the Making" and it also has a website. Echoes of Rachel Carson.
It's also not looking good for the British Bee Keeping Association. People are starting to ask awkward questions.