Start the fight with the black flies right now. If the insect is small, then you can try to destroy them yourself, without the use of chemicals. It is possible to collect midges hands or shoot down with water. Most often insects are hiding on the underside of leaves.
If the black flies invaded your garden, then come to the aid of other, more effective methods. To destroy insects by using a solution of liquid soap, garlic and oil. For its preparation you need to take 2 tsp liquid soap, 1 liter of water, 10 cloves of garlic, 4 tsp sunflower oil. All the components must be mixed and used for spraying plants.
Get rid of the black gnats, you can use the leaves of tomatoes. You need to take 4 cups chopped leaves and 4 cups of water, mix and leave for 12 hours. Spraying should be carried out daily or every other day, to the complete destruction of black midges. It is best to spray the tomato in the evening.
The emergence of black gnats, you can try to prevent. The black gnat will not start near the onions and garlic. These plants can be planted together with tomatoes in the same bed. Wasp, fly-gorzalka, ladybug, zlatovlaska – these insects are the enemies of black midges. If near your beds will be a hornet's nest, aphids are unlikely to settle on your plants.