I IPM of Cruciferous Vegetables Key Pests: *White butterflies:small white butterfly Pieris rapae; Diamond-back moth Plutella xylostella; *Aphids:peach green aphid Myzus persicae;cabbage aphid Brevicoryne brassicae.Ⅰ. IPM of Cruciferous Vegetables Key Pests: ™ White butterflies: small white butterfly Pieris rapae; ™ Diamond-back moth Plutella xylostella; ™ Aphids: peach green aphid Myzus persicae; cabbage aphid Brevicoryne brassicae