Landscape Response to Hemlock Woolly Adelgid in Southern New England 1997-2011

The hemlock woolly adelgid (Adelges tsuga Annand; HWA), a small, aphid-like insect native to Japan, is currently migrating Northward through eastern North America and threatens to eliminate eastern hemlock (Tsuga canadensis (L.) Carriere), one of the most abundant, long-lived shade tolerant species, across its range. In addition, a second invasive pest, the elongate hemlock scale (Fiorinia externa; EHS), often co-occurs with HWA on hemlock with unknown long-term consequences. This study was started to analyze Hemlock tree stands, the damage created by HWA and the long term consequences of EHS.

铁杉球蚜（Adelges tsuga Annand；HWA）是一种体型微小、形态类似蚜虫的昆虫，原产于日本，目前正向北美东部北迁，对分布区内的东部铁杉（Tsuga canadensis (L.) Carriere）构成灭绝威胁——东部铁杉是该区域最丰富、长寿且耐阴的树种之一。此外，第二种入侵害虫长形铁杉盾蚧（Fiorinia externa；EHS）常与HWA共同寄生于铁杉之上，其带来的长期影响尚不明确。本研究旨在对铁杉林分、HWA造成的危害以及EHS带来的长期影响展开分析。