Over the past decade, beekeepers in the U.S. and other countries have had problems keeping their bees healthy. Some of the potential causes of their problems include the Varroa destructor mite, pesticides, pathogens, and the reduction of floral resources due to land development or conversion.
To make matters worse, there has been a lack of useful, long-term datasets on the size of honey bee populations. This lack of data makes it difficult to quantify actual changes in honey bee abundance, and to determine what causes population declines.