入侵性黄蜂正逼近北美榆树

Invasive wasps are coming for North America’s elms By Ute Eberle ● She’s less than a centimeter long, produces only daughters and is conquering the continent without a single male. Meet the elm zigzag sawfly, named for the delicate zigzag patterns she carves into elm tree leaves. Despite her name, the elm zigzag sawfly (Aproceros leucopoda) is not a fly; she is a type of wasp first found in North America in 2020. Originally from East Asia, the species has expanded its range at an “alarming” rate, researchers report in the Journal of Integrated Pest Management. For cities still recovering from elm canopies lost to a fungal disease, it’s an unwelcome second wave of assault. …