Fighting mourning flies - the best 10 remedies

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Fighting mourning flies - the best 10 remedies: mourning

Mourning flies swarm around the flowerpot on the windowsill. This is not only annoying and unpleasant for the plant owner, but also harmful to the plant. Although the flies themselves are no longer at risk, the larvae eat their roots and can cause harm. Therefore, the mourning flies and their larvae should be successfully fought. For this there are many home remedies to remove the pests back out of the ground or prevent it and not even let it come to an infestation

Detect infestation

It can not immediately be recognized that mourning flies have settled in the soil of the flower pot or on a garden bed. If the affected plant has just been supplied with new soil from the trade, then it may well be that the larvae have already been in this earth and are now hatched. But even from the outside, mourning flies can enter the apartment and infest one or more plants here. For those who want to be sure, there's a potato crack in the ground. The larvae like them and nibble on them. So if there are scary places to see, there are already larvae in the ground and you have to act fast. Further features for an infestation:
  • Hundreds of small, black flies swarm around one or more plants
  • when the earth is touched, they fly up in droves
  • especially very humid soil
  • usually settle in flowerpots or greenhouse
  • Rarely are garden beds infested


The grubs of the European Mourners need a permanently moist soil, so that they can move. Therefore, the plants in the pots or in the greenhouse should never be kept moist throughout. It is better to let the soil dry between two casting operations and thus to offer the insects no pleasant environment for them. So that the insects do not get from the outside to the potted plants in the apartment, do not put them near an open window. Other preventive measures are also helpful:
  • Mourning flies can be brought in with commercially purchased earth
  • Therefore, let the soil stand for a few months before use
  • Relieving ground cold also helps
  • as well as heating the earth to 60° to 70° Celsius
  • Make sure that there is no pile of leaves in front of an open window
  • Foliage is a popular environment for the mourning fly in nature

Emergency measures in case of infestation

Mourning Fly - Mourning Gnome

If the small flies have been discovered on a plant, egg laying should be prevented immediately so that not more flies are added. Because a female fly lays up to 150 eggs, so it goes quickly with the multiplication. Immediately, the earth should be covered with sand, so the female mourning flies do not come to the damp earth to lay their eggs here. The adult insects like the color yellow, so they can be attracted with yellow boards from retailers. The insects fly on the boards and stick to the glue applied here. However, this should only be done in addition to other means, as there is no guarantee that all flies will be caught and no more eggs will be laid.
Tip: When mourning flies are discovered, it is helpful to not only tackle it with a single action, but to combine various control measures.

Home remedies to combat

Mourning Flies - Fighting Mourning Gnats

There are some simple home remedies for controlling the mourning flies that have been proven. These are the following:
  • Mix of baking soda, salt, oil and lukewarm water - sprinkle plant with it
  • Put matches in heads with the heads down
  • whole tuber garlic stuck in the infested soil
  • alternatively, chop garlic and sprinkle over soil
  • also cinnamon scattered on earth helps
  • Add lavender or tea tree oil to the irrigation water
  • Pull a fine stocking for ladies over the pot
  • must be tightly closed
  • pay attention to hole formation
  • so no new flies come in
  • the flies from the inside no longer out
  • In this way, egg formation can be prevented
  • this measure should last at least four weeks


Roundworms are natural enemies of the larvae and can be seen as a permanent solution against infestation. The worms are available in well-stocked retailers and are simply transported with the irrigation water into the ground. Here they settle down and start to feed on the larvae. So no further mourning flies can hatch and the population will become extinct after some time. Since nematodes like moist soil, in this case, the control of the earth must be kept moist, otherwise the worms die.

predatory mites

Just when mourning flies were spotted in a greenhouse, it is advisable to fight them with their natural predator, the predatory mite. In trade, the various predatory mite species are offered with their different preferences.One species of these prefers especially the larvae of the mourning flies as food. The mites, which are about 1 mm in diameter, are supplied in a mixture of peat and vermiculite and must be scattered on the affected soil. Since a temperature between 15° to 30° C is desirable, this is the ideal control in the greenhouse. Of course, the plants on the windowsill with predatory mites can be freed from the annoying mourning flies. The procedure should be as follows:
  • useful for the longer application
  • Development to the adult predatory mite takes about 12 days
  • but already after hatching from the egg, the mite feeds on larvae
  • Predatory mites can survive for several weeks without food
  • can therefore also be used preventively
  • 100 mites on one square meter are sufficient for prevention
  • if infested, at least 250 mites per square meter should be exposed
  • in case of very strong infestation, expose more mites after another week
Tip: Since the predatory mites fight only the larvae, but not the adult mourning flies, it makes sense to take further measures against the adult pests. Against this, it is also possible in this case to proceed again with yellow bubbles.
If one or more plants have been attacked by the annoying mourning flies, then immediate action should be taken. Because insects are not only annoying because they fly in swarms to hundreds of a flower, the larvae that live in the damp soil, are also permanently harmful to the plants as they nibble the root. But there are some means to get rid of the annoying pests, including natural predators and household harmless budget resources. Prevention is also important so that the flowers on the windowsill and in the greenhouse are not attacked at all.

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