More than a half polyphagous, nearly a half Oligophagous or knowing only one host.
有过半种类为多食性，近半为寡食性或仅知一种寄主。
2
The pest is polyphagous, has obvious selectivity for hosts and good adaptability to tobacco.
该蝇系多食性害虫，对寄主作物有明显的选择性，对烟草有较强的适应性。
3
The beet armyworm, Spodoptera exigua (Hubner), is a polyphagous noctuid of worldwide importance that feeds on various agricultural crops, including vegetable, cotton and ornamental.