There is a new suspect thought to contribute to the demise of honeybee (Apis mellifera) colonies worldwide, termed colony collapse disorder (CCD).
Until now, scientists have identified a host of potential culprits including pesticides that might weaken their immune systems, pathogens, parasites, and malnutrition from poor nutritional sources:
Another potential culprit is a virus found in nearly all the CCD hives examined by researchers in prior studies called Israeli acute paralysis virus (IAPV):
Shown in the image above is a fly (Apocephalus borealis) that Dr. John Hafernik from San Francisco State University observed parasitizing honeybees. The flies insert their eggs into the bees and the bee’s body is then taken over by the developing fly larvae. This is reportedly the same fly species that parasitizes bumblebees and paper wasps. Dr. Hafernik was surprised that with all of the research on honeybees and CCD, this parasite had not yet been detected. Evidence of the fly was found in 77% of the hives that were sampled in Northern California and the Central Valley of California as well as South Dakota.
Source of information and images: