defoliate [ˌdi:ˈfoʊlieɪt]

例句:

• Large infestations can completely defoliate and eventually kill plants.
  来自BBC
• The tree is leafless [ defoliate ] .
  这棵树 秃 了.
  
• Dioxin was the ingredient in Agent Orange, used to defoliate Vietnam.
  越南战场上用于毁灭林区的“橙剂”，其成分是二氧杂芑。
  
• Infestations of sawfly larvae often defoliate plants although infestations are usually localised and rarely devastating.
  来自BBC