So, we talked about how to deal with the onion fly, now let’s talk about how to deal with its larvae. If the infection has already begun, and you see not only a fly, but also note the yellowing of the onion leaves, then as soon as possible you need to sprinkle the areas of the garden where the infection occurred with a mixture of river sand and naphthalene. In this case, ten parts of naphthalene are needed per part of the sand. It is necessary to scatter without creating a layer, just so that the soil is a little covered.
They can effectively cope with the larvae of an onion fly treated with infusions of needles, valerian, mint, and wormwood. Needles per liter need 50-100 g, this is the dose per square meter; Valerian herbs – about 500 g per bucket of water, this is the norm for 3-4 square meters; mint can be larger, for a sharp aroma, about a third of the bucket and consumption is also 3-4 square meters, and wormwood – a quarter of the bucket should be filled with water, let it brew for a day and can be used, spending 2-3 square meters of beds.
Gardeners also speak well of treatments against onion flies with laundry soap or liquid antibacterial soap. Laundry soap needs about half a piece per bucket of water, antibacterial liquid – 50 grams per bucket of water. Do not forget that the soap is the best (without flakes) dissolved in soft water, the ideal option is rainwater. Soil can be used to treat both soil and leaf blades, wetting the surface well, especially in those plants whose feathers began to turn yellow. In the case of soap, up to three treatments can be carried out with a break of one week.
Another interesting option: the oldest insecticide is kerosene. Kerosene can also be used to combat onion fly larvae. Kerosene is good because it is practically safe for humans and soil, but harmful to onion fly larvae. Naturally, pure kerosene cannot be used, it must be diluted strongly. So, to fight against larvae, you need only 50 g of kerosene per bucket of water, this composition can be filled into a spray bottle and thoroughly treat the soil with each bulb, especially carefully for those whose leaves began to turn yellow. Do not forget that to consolidate the result immediately after harvesting, the soil needs to be dug up to a full bayonet of a shovel with a turnover of the reservoir, but without loosening the clods, then the larvae that have accumulated in the soil for wintering will die from frost.