where can i buy onion maggot powder?
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.