The fight against onion flies is a hot topic for gardeners who grow onion vegetables and flowers. Such an insect can in a short time not only completely destroy the planting and future crop, but also make the used agricultural land unsuitable for the subsequent sowing of such plants.
Onion Fly: Photo and Description
Here is an onion fly in the photo and in the description. The color of the fly is ash gray with a greenish tint, resembles a housefly and a cabbage fly, but smaller, 5–7 mm in size.
Pupae overwinter in the soil at a depth of 10–20 cm in areas where the pest developed. The fly begins to fly from mid-May, which usually coincides with the flowering of cherries and dandelion. Soon, the female lays eggs on the soil near the plants or on dry scales of onions in a few pieces. They are white, clearly visible on the soil, with a knife they can be slightly moved away from the plant, and then the released “legless” larvae will die before reaching the bulb.
How to Get Rid of Onion Flies With Water
If the eggs are not raked, then the spawning larvae get to the plant, where they bite into the tissue. Climbing into the plant through the base of the leaves or from the bottom, they begin to eat juicy scales. The bulb usually collects up to 10 larvae, they are white, legless, the head section is narrower, up to 10 mm in size. Damaged bulbs rot and the plant dies. Such plants must be very carefully removed using a scoop from the soil and put in a bucket of water, where the larvae will die. This is the answer to the question of how to get rid of onion flies with water.
It should not be delayed in carrying out this work, as the larvae can remain in the soil where they pupate, and second-generation flies will appear in July.
Means and Methods of Dealing With Onion Flies
To prevent the pest from flying on this year’s onion, such methods of controlling the onion fly are used as the spatial isolation between onion plantings should be at least 400 m, which is practically impossible to do in the garden plot. Therefore, beds with onions protect (restrain) from colonizing the onion fly by placing onion plantings near the carrot crops, as carrot volatile stains repel the pest. This is an effective remedy for onion flies.
How to Deal With Onion Flies?
If you were “visited” by an onion fly, the fight against it should begin with compliance with the rules of agricultural technology. Early planting of onions and mulching of the soil with peat make plants less affected by the pest. Sprinkling the soil around the plants with tobacco (shag) dust mixed with ash (1: 1) scares off the onion fly, and if you repeat this treatment 3-4 times every 6-7 days, the onion will be guaranteed to be free from pests. Before fighting the onion fly, remove all parts of the plants damaged by the insect from the site.
You can use other odorous products – ground pepper, ground bitter wormwood, naphthalene, technical camphor.
Autumn digging of the soil on the onion beds should be mandatory, as it leads to the death of wintering pupae.