Now this has been a huge problem for many years, basically since the late 1980s, when the varroa mite came and brought many different viruses, bacteria and fungal diseases with it.
これは長年大きな問題になっているのですが 1980年代にバロアダニが入ってきて 様々なウィルスや細菌を持ち込みました そして真菌病をもたらしました