What is the whitish tissue that sometimes appears inside a peach near the pit? Is it a disease or harmful to eat?

Answer: This whitish tissue may actually appear on the pit and/or in the pit cavity (area inside peach around pit) of a ripe peach. It is called callus tissue (undifferentiated cells). It is not a fungus, bacteria or other type of disease. It is naturally occurring, and it is not harmful. It can be safely eaten along with the rest of the peach. See photo at right.