In this case, the next step would be to use a pest control called insecticidal soap.

在这种情况下，下一步就要使用一种叫做杀虫害虫控制方法。

Their saliva, meanwhile, contains a toxin which causes those leaves to curl up and harden, providing an excellent place for them to shelter, including from insecticidal sprays.

它们唾液中含有毒素， 会导致叶子曲并硬化，为它们提供了一个极好藏身之处，包括躲避杀虫。

Many of the plant molecules that humans have adopted as drugs, medicines, and seasonings evolved as part of plants' immune systems because they're antimicrobial or insecticidal.

人类采用许多植物分子作为药物、药材和调味品，它们在进化过程中成为了植物免疫系统一部分，因为它们具有抗菌或驱虫特性。