Adelges is a genus of insects which feed on conifers. They have complex life cycles, some species feeding exclusively on spruce , others feeding on spruce and an alternate conifer . However, galls characteristic of each species are formed only on spruce.

The hemlock woolly adelgid (Adelges tsugae) is a serious threat to our state tree, the eastern hemlock, in Pennsylvania and across the United States. This non-native invasive insect has caused significant hemlock defoliation and mortality in Pennsylvania forests.

The pineapple gall adelgid (Adelges abietis) is a species of conifer-feeding insect that forms pineapple-shaped plant galls on its host species, commonly Norway and Sitka spruce. The adelgids (genus Adelges) are pear-shaped, soft-bodied green insects with long antennae, closely related to the aphid. [1]

Adelges aphids are often identified from the shape of the galls on the primary host (spruce) which are cone-like, sometimes resembling miniature pineapples. Forms on the secondary host often produce abundant wax. There are about 30 species of Adelges worldwide.

While spruce is the primary host for this insect, research suggests that the larch adelgid can complete its development and remain solely on larch hosts, without spruce present in the nearby area. On larch, the adelgids overwinter as nymphs near the buds. Once buds begin to swell in the spring, nymphs begin feeding on the opening buds.

Adelgids produce a white cotton-like appearance that covers a small, dark-colored body. Symptoms and Diagnosis. They can appear as white, cottony tufts on bark, branches, twigs, needles, or cones on host plants. Cone-shaped galls, or swollen twigs, can also be found on infected spruce and fir.

Adelgids are small, aphid-like insects that are always associated with conifers. At one time, they were considered to be aphids but now are in their own family (adelgidae) within the insect order Homoptera. They are most closely related to the woolly aphids (Eriosomatidae) and the Phylloxeran aphids (Phylloxeridae).

The meaning of ADELGES is a genus of aphids related to phylloxerans and feeding chiefly on spruce and balsam on which they often cause damaging and unsightly galls.

Adelgids (family Adelgidae) are aphidlike insects that suck plant juices from conifers. At least eight species occur in California. Hosts include Douglas-fir, fir, hemlock, larch, pine, and spruce. Adelgids commonly occur beneath cottony white or grayish wax …

Nov 17, 2023 · An online resource devoted to North American insects, spiders and their kin, offering identification, images, and information.