The two-lined hooktip moth lays its eggs in even rows on twigs and leaves of birch and alder trees. When the eggs hatch, almost inscrutably small larvae emerge, some as short as half a millimeter. But ...

The ash pollen season began around a week ago. In the next few days, however, the highly allergenic birch trees will also begin to bloom. According to the press release, one in five people in ...

A new study finds that people watching nature videos reported electric shocks as less intense, a pattern also observed in their brain scans ...

Tree pollen levels in Portland are on the rise, causing symptoms of sneezing, itchy eyes, and difficulty breathing in those with tree allergies, and health officials recommend staying indoors, ...