How can maggots appear on rotten food even if it was stored inside a container all the time?
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Flies don’t need a huge gap to be able to crawl into. If the gap is big enough for air to escape to signal them of rotting food to feed their babies, it’s probably big enough for them to squeeze in and lay their eggs. Reproduction is their main concern, not caring if they can make it back out- they may not need to.
Many things come with you food, and many of them are alive.
It is extremely common for weevils to be in with grain and rice. The eggs hatch and end up in the egg.
Store a bag of rice in 8 ziplock bags and check it a year later and see how many weevil corpses are in there.
The primary reason is, you can’t wash rice and wheat like you can an apple, so you can’t remove bugs that way.
You could irradiate them, but that’s not done in many countries because their populations are full of morons.
They were already there, or at least the eggs were. They were just originally so tiny you could not see them. You’d be surprised how many insects and their eggs you eat on a daily basis.
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