: an act of showing someone how something is used or done : demonstration. 1  I saw a demo on how to use the computer program. 2  The salesman gave us a demo of the vacuum cleaner, and it seemed to work very well. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples 3
If however, you are talking about some maggots in a bowl of wet food (either canned food or dry food which got wet or which you deliberately added fluid to) it is a different matter. Maggots come from flies eggs and they take some set period of time to hatch from the eggs.
Introduction. The onion maggot is the most damaging insect pest of onions throughout the northern areas where onions are grown. If not controlled, it can prevent the production of a marketable crop.In Ontario, the onion maggot has become difficult to control.he onion maggot is the most damaging insect pest of onions throughout the northern areas where onions are grown. If not controlled, it can prevent the production of a marketable crop.