How to tell the difference between sugar crystals and mold in dried fruit?
If you are talking about the cut surface of the pears, especially near the core cut-out, those little white dots may be not sugar, but a normal occurrence in pears, little gritty cells in the fruit. They are what crunch between your teeth when you eat a pear, aren't harmful, and are not mold. Mold would be in irregular patches likely with a greenish/bluish/grayish tint, and the larger patches would probably look a little furry, or at least have a matte finish, not shiny. This very uniform array of tiny dots (at least what I see) don't look like mold.