Small black bugs on the onion, if the number of small black bugs is small, and the area of devouring the onion leaves is small, after removing the black bugs can generally eat, but before eating, you need to soak the onion fully in water, and carefully cleaned to prevent the residual bugs and eggs are eaten into the body, causing harm to the body's health, and in the cooking process, you need to be thoroughly cooked and eaten again.

But if a large number of black worms grow on top of the hairy onion, and the area of the hairy onion leaves is subjected to a lot of corrosion, it is not recommended to eat, it is best to directly discard, to avoid cleaning imperfectly will be the small black worms or residual worm eggs eaten into the body, causing harm to health.