The volatile oil and its major component precocene Ⅱ not only had insecticidal efficacy,but also anti\|feeding effect and delayed molting of insects.
挥发油及其主要成分胜红蓟素不仅具有杀虫活性，而且引起昆虫拒食和延迟蜕皮。
参考来源 - 胜红蓟化感作用研究 V.挥发油对真菌、昆虫和植物的生物活性及其化学成份 Allelopathy of Ageratum conyzoides Ⅴ.biological activities of the volatile oil from ageratum on fungi·2,447,543篇论文数据，部分数据来源于NoteExpress
A steroid hormone produced by insects and crustaceans that promotes growth and controls molting.
昆虫和甲壳纲动物产生的类固醇激素，以促进生长，控制蜕皮。
Insects solve the problem by molting: As they get too large for their armor, they simply shed it.
昆虫解决问题靠脱皮：如果他们癿身体对盔甲来说太大了，它们便简单癿摆脱盔甲。
That means big birds have to evolve different molting patterns to deal with their slowpoke feathers .
这意味着体积大的鸟为了应对自己老化的羽毛，必须进化出不同的换羽方式。
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