This fly is called onion because it most often affects onion plants, but sometimes it can attack garlic and even bulb flowers. Usually, onion or leek flies show signs of damage to the onion with the naked eye. If the onion in your area suddenly began to grow slowly, if its leaflets-feathers began to turn yellow, wither and dry, and the smell of the onion does not come from the onion at all, it means that it is definitely struck by the onion fly. If the bulb is dug up on the affected plants, then it will be possible to see a plaque-like plaque on it, subsequently, the bulbs will become soft and it will be impossible to store or eat them.

What Does an Onion Fly Look Like?

This insect really looks like a small fly of a light gray color. The length of the fly is about a centimeter, to distinguish a female individual that is able to lay the ovipositor from a male one, which is not capable of this, it is possible by a dark stripe on the abdomen: only males have this strip.

Females of the onion fly are very prolific, in their life they are able to lay up to six dozen eggs with a noticeable longitudinal stripe on the leaf blades of the onion or on the bulbs themselves if they protrude from the ground. The length of each egg is about a millimeter.

From the time of the ovipositor to the appearance of the larvae, usually, six to eight days pass, that is, quite a bit of time. After the larva is full enough, it pupates and young individuals of the fly — males or females — leave the cocoon. The onion fly begins its age very early, usually already in April, including why it is considered a very dangerous pest.

How to Treat Plants Against Onion Flies?

To protect against onion flies on large plantations, where there is simply nothing to do with folk remedies, modern and permitted insecticides are used. For example, neonicotinoids – Thiamethoxam and Imidacloprid, as well as organophosphorus compounds – Diazinon and Dimethoate, have gained popularity. Pyrethroids such as Stomazin, Ripcord, Tsipermetrin, Stomoksin, and Baytikol proved to be quite good in the fight against onion flies.

These drugs are used in liquid, dissolved in water form, with their help they fight the onion fly by spraying. When processing using these drugs, you must strictly follow the instructions on the packaging. The active substances of these drugs affect precisely adult insects, causing their death.

Those who do not accept the use of chemistry at their sites can recommend one of the alternative methods of struggle against onion flies, which we will talk about now.


So, we now know a lot about the onion fly, we know that it can give up to six dozen eggs per life, that it starts flying in April, and that the larvae hatch in a week or so. We know how to deal with a fly and how to minimize the risk of its emergence or wintering of larvae; all that remains is to put it into practice, and then we can forget about chemical preparations forever, and forget about crop years.

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