Green stain is a disease of Anjou pears in the Pacific Northwest. It is characterized by dark green specks and irregular blotches anywhere on the skin, and by longitudinal dark green streaks on the stem-end of the fruits (see photo). As the fruits ripen, the dark green, abnormally colored areas may turn brown, causing them to be somewhat confused with superficial scald. Green stain is strictly a skin disorder, which does not interfere with the dessert quality of the fruits. Affected fruits are generally removed in the packinghouse, but a few may reach the market in packs of low-grade fruits. The exact cause of green stain is unknown, but it is thought by many to be a virus disease.
Pear green stain