This tiny parasite spreads across the forest by hitch-hiking on birds. HWA use sucking mouthparts to pierce through the base of the hemlock needles into the parenchyma cells (nutrient transport cells) ...

Needles – 2-ranked; 1/2″ long; tapering from the base to the apex; 2 lines of stomata on underside. Cones – about 2/3″ long; ovoid; scales with entire margins. “When the wind lifts up the Hemlock’s ...

According to the Pennsylvania Department of Conservation and Natural Resources, their eggs can be found in cotton-like masses on the undersides of hemlock needles. They feed by sucking the ...

More than 20 years ago, a visitor from Asia showed up in Shenandoah National Park. The new arrival was small and unassuming. In fact, if it weren’t for little white tufts visible on eastern hemlock ...

Hemlock woolly adelgids on hemlock tree needles are seen through a microscope at a lab in Petersham, Mass., Oct. 5, 2016. THE CANADIAN PRESS/AP-Elise Amendola FREDERICTON — The offspring of ...