What causes a avocado to spoil?

Answer 1

• an avacado will eventually spoil like any fruit over a period of about 3-4 weeks after being picked bacteria will get into the fruit and it will turn to slimy mess. While the avacado wont ripen on the tree it will start growing the seed. The way to tell its growing is it will sound hollow and you can hear the seed slapping around inside

Answer 2

Simply, time. Avocados change very quickly from "perfectly ripe" to "ewww" It's important to buy a ripe avocado within a day or so of when you plan to use it.