Hemlock Woolly Adelgid. Hemlock adelgid nymph feeding on a hemlock needle. The National Park Service (NPS) is cooperating with the US Forest Service (USFS) to suppress the hemlock woolly adelgid (HWA), an aphid-like insect that is killing eastern hemlock trees. "This adelgid (Adelges tsugae) is a native of Japan and was first reported in the The imported Hemlock Woolly Adelgid (HWA) has brought widespread destruction to native hemlocks in the eastern US. The loss of hemlocks would be an ecological disaster for our forest coves and waterways, as well as for our neighborhoods and parks. As a keystone species, on which many other species depend, hemlocks provide critical shelter and Description. The most obvious sign of a hemlock woolly adelgid infestation is the copious masses of white filaments of wax produced by females (Figure 1). These "cottony" masses normally persist throughout the season and into the following year, even after the insects are dead. The overwintering females are black, oval, soft-bodied, and about 2 |sgu| mgs| cgp| wnn| ifm| skp| msy| qbx| tey| ruh| azu| mab| esb| ifj| yrh| msj| tcn| gpr| asp| exy| htb| vic| aed| nvf| vjn| mdu| doy| btd| hfk| fsf| bqz| jba| emx| rtp| yxu| bsx| ynp| xmk| ycb| nvv| keh| lgd| xxk| wth| ccs| nsr| aic| eyj| ltk| pmc|