We never seem to have a shortage of pests in our woodlots that can substantially alter our landscapes if left to their own devices. Many of these pests (particularly insects) have migrated from overseas and are spreading throughout the eastern United States, some at a fairly rapid rate. One of the more damaging pests, in particular, is the Hemlock Woolly Adelgid.
Our friends at Arborjet describe the Hemlock Woolly Adelgid (HWA) as “a tiny, piercing and sucking insect, unseen with the naked eye, that feeds on hemlock twigs at the bases of the needles. HWA is an invasive species from Asia which has infested the US East Coast hemlock forest from New Hampshire to Georgia, inhibiting twig growth throughout. It has also recently been found in Michigan and it is believed to be expanding its range due to changes in climate. HWA has a complex life cycle; its winter generation and spring generation overlap in the spring. It feeds and reproduces during the colder months, going dormant in the summer.”