the water and the seeds
The most common mold to which apples and citrus fruits is Penicillium digitatum.
Apples typically stay fresh for over a week. They can grow mold and the dark spots with slightly fuzzy centers are signs of mold. When apples are brown or dark on the outside, it is a sign that they can be moldy.
Apples mold because a species was found inside the apple which is called the BOTRYTISE CINEREA PERS.ex.Fr
whitish-blue
Definitely oranges, from personal experience. They will mold first where they are touching a surface. If the bottom of your orange seems to have flattened, then likely there is mold under there.
Blue mold, caused by the fungus Penicillium expansum, is the scourge of apple breeders and producers throughout the world, causing extensive losses to stored apples
liam causes it
gray
Mold spores and the right conditions for them to grow into visible mold.
Mold grows faster in an environment that seals in moisture. Apples create juice. If left out, it will grow mold. But a little slower than an apple in a bag.
oxidisation