Should they find themselves in an environment without natural enemies, their population often increases drastically, often at the expense of crops and other plants.
沒有了天敵的生物就會大量繁殖、生長，危害到其它生物。小蟲立大功雖然各國海關都備有種植區和育養區，以便長期觀察入境的動植物是否帶菌，或會不會破壞本國的生態環境。