Why does fruit go bad?
When fruit spoils, it's because various organisms have been eating it, and
the spoilage is what's left when they're done. These organisms include fungi (molds,
primarily) bacteria, even larvae of fruit flies. Fruit can taste bad even when it still
looks okay, because these microorganisms have already produced their byproducts, and
what you taste is what they've left behind.
Click here to return to the Biology Archives
Update: June 2012