There are many possible reasons for colony collapse. The most often mentioned factors include agricultural chemicals (pesticides), viral and bacterial infections, global warming or climate change, electromagnetic interference, and genetically modified crops, but discussions thus far remain inconclusive.
原因很多，最受討論的包括：農藥（殺蟲劑）的使用、病毒與細菌的感染、氣候暖化或變遷、電磁波的干擾、基因改造農作物等等，但都沒有定論。