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。
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。
The beet armyworm, Spodoptera exigua (Hubner), is a polyphagous noctuid of worldwide importance that feeds on various agricultural crops, including vegetable, cotton and ornamental.
甜菜夜蛾隶属于鳞翅目夜蛾科，是一种世界性分布、杂食性重要农业害虫，主要危害蔬菜、棉花和观赏植物。
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