Leek Leafminer: Wrestling And Treatment

leek leafminer

Appeared in Alsace in 2003, the leek leafminer has progressed to the west to the point of becoming one of the most formidable enemies for leek.

If there is a parasite that undermines leek crops, it is the leek leafminer! If we still have trouble eradicating it, then it remains to prevent its appearance...

A small grayish fly 3 mm long and known as Phytomyza gymnostoma, the leafminer attacks leeks twice a year, in spring and in autumn.

If the damage is mostly peculiar to the leek, the leafminer can also attack the chiveat theshallot et al'onion.

  • To read: know everything about leek farming

Conditions of development of leek leafminer:

To date, no study has been able to formally determine the development conditions of leek leafminer.

Several parameters can be taken into account such as the temperature, the humidity level or the quality of the soil but none can be considered as obvious or determining.

Period of attack of the leafminer of the leek:

One certainty today is that the leafminer has 2 flying periods in the year, in the spring and in the fall.

We thus see attacks in April, May and June then in late summer, from August to November.

The larva is yellow in color, becoming a reddish-brown pupa before becoming an adult fly.

Life Cycle of the Leek Leafminer:

  • The male fertilizes the female who lays her eggs after having provoked punctures of nutrition on the leaves. These bites cause small white dots on the top of the leaves.
  • Once these bites are made on the top of the leaves, the female flies lay their eggs there, which will become yellow larvae.
  • These larvae will feed on the leek plants by digging tunnels to the base.
  • The red-brown pupae are then formed at the end of the galleries made by the larvae.
  • The pupae will remain on the leek plant all summer until they become adult flies. these same flies will fly in late summer and fall for a new fertilization period.
  • Fall pupae spend the winter in leeks to resume their cycle in the spring.
  • As you can see, if you do not pull the infested plants, the leek leafminer can start the fertilization and lay cycle for a long time.

Treatment and fight against leek leafminer:

Today, there is no cure for leek leafminer.

It is however possible to avoid its appearance by protecting the cultures of leeks.

The anti-miner's fillet of leek:

  1. The priority and the most effective means of control is the anti-insect barrier with a mesh size of 5 mm maximum, ideally 850 μm or microns.
  2. Press the hoop so that the net is not in contact with the leeks
  3. Make sure there are no gaps, even at ground level, larger than 5 mm.
  4. You will be able to remove the net after any risk of attack of mineuse.

Destroy the attacked leek plants:

  1. Prevention also involves the destruction of all infested plants.
  2. Do not put in compost because the pupae could reappear elsewhere and make your compost unusable.
  3. Make sure you have everything torn out because the slightest trace of remaining leafminer can be enough to make the fly reappear.

Insecticide and repellent plants against leek leafminer:

To date, there is no effective insecticide against the leafminer, whether organic or systemic insecticide.

But some odorous plants seem to have a positive effect as a repellent against leek leafminer.

  1. It is therefore important to plant the leeks in small groups in the midst of repellent plants.
  2. We find as plant, mint, lemon balm or the street.
  • To read: know everything about leek farming
  • To discover: all the cards and recipes on the leek

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