COLONY COLLAPSE DISORDER

Bees are an essential part of our life-cycle. Without them, flowers would not be pollinated and crops would fail. And as the world’s human population continues to grow, bee numbers in recent times have been falling, indicating that there is a big problem looming. Scientists are concerned.

Biologists and environmentalists have been puzzling about the cause for some time. Of particular concern is what has become known as colony collapse disorder, an affliction that has already led to the death of entire hives of bees during the winter months. The collapse of colonies is something which has been happening with frequent occurrence. The finger of suspicion is now pointing ever more firmly at insecticides and aggressive agricultural practices, especially those chemicals containing compounds known as neonicotinoids.

These are recently developed pesticides that have become widely used in agriculture because they are much less toxic to humans and other animals than the chemicals they replaced.

Evidence is mounting, though, that they are highly toxic to bees. A scientific study has found that hives that had similar levels of mite and parasite infestation, also thought to be a factor in colony collapse, were much more likely to die if the bees had also been exposed to neonicotinoid pesticides.

Empirically, several studies have now borne out this effect, with researchers edging closer in identifying the casual mechanism – that neonicotinoids are responsible for disrupting the immune and neurological systems of bees. This makes them less resistant to disease caused by parasites.

European and British regulators have already moved to restrict the use of neonicotinoids, but the case for a much tougher clampdown to reverse the loss of honey bees is gaining traction.