Fall Armyworm wani nau'i ne na magudanar da ta fito daga Arewacin Amurka da Kudancin Amurka kuma tana iya yin illa ga amfanin gona. Kalmar “faɗuwa” tana nufin lokacin da aka fi ganin tsutsa na nau’in asu Spodoptera frugiperda, wanda aka fi sani da fall Armyworm. Kalmar "armyworm" ta zo ne daga gaskiyar cewa tsutsa na wannan nau'in suna tafiya a cikin manyan kungiyoyi, kamar sojoji yayin da suke tafiya a cikin gonaki suna cinye ciyayi.