Aphthona cyparissiae is a species of leaf beetle known as the brown dot leafy spurge flea beetle. It is used as an agent of biological pest control against the noxious weed leafy spurge (Euphorbia esula). This beetle is native to Europe. It was first released as a biocontrol agent for leafy spurge in the United States in Fremont County, Wyoming in 1986. It is now established in much of the northern United States from Washington to Rhode Island, though it is now scarce in North Dakota and Minnesota. It is still the dominant Aphthona species at some release sites in Manitoba.