Where do food moths come from?

Contrary to popular belief, food moths (sometimes called moths) do not necessarily come from poor hygiene. They most often arrive with the food itself.

Here’s how they get into your home:

• Products already infested in the shop: microscopic eggs can be found in a packet of flour, rice or cereal.
• Eggs present in packaging: even if unopened, a packet may contain eggs laid during packaging.
• Originating from another home: adult moths can move from one flat to another, especially in buildings with windows.

Stage 1 – Food moth eggs

Food moth eggs are very difficult to spot, even when you know there is an infestation.

What do these eggs look like?

• Size: approximately 0.3 to 0.5 mm, invisible to the naked eye.
• Colour: off-white to pale yellow.
• Location: always deposited in contact with food, as the larvae feed immediately after hatching.
• Hatching time: 4 to 7 days: heat (between 20 and 30°C) promotes faster hatching.

Most infestations are caused by eggs already present in food at the time of purchase. This is why moths can be found even in perfectly clean cupboards..

Stage 3 – The moth chrysalis

After the larval stage, the food moth transforms into a chrysalis. At this stage, the infestation in your kitchen is well established.

Moth larvae seek out dry, dark and undisturbed places to pupate.

They often settle in:

• The corners of cupboards and shelves
• The corners of drawers
• Under or behind infested packages
• Hinges and hard-to-reach areas
• Along skirting boards or on the ceiling of the cupboard

These cocoons can remain in place for several days before the moth emerges to take its adult form..

A four-stage life cycle

1. Eggs

Females lay up to 200 eggs directly on textiles or in the corners of wardrobes. The eggs are tiny and invisible to the naked eye.

2. Larvae

It is the larvae that hatch from the eggs that make holes in your clothes. They feed on keratin, a protein found in:

• wool,
• untreated cotton,
• silk,
• cashmere,
• feathers and fur.

They then dig the famous moth holes in clothes, throws, carpets or blankets. Clothes that have been stored for a long time without being washed or protected are the first to be affected.

3. Pupae

The larvae wrap themselves in a cocoon to transform. These cocoons are sometimes visible in the folds or corners of furniture. Generally, these chrysalises are found in dark places such as cupboards, drawers or under carpets.

4. Adult moths

Adult moths have a short lifespan. Their only role is to lay eggs, not to eat textiles.

1. You bring contaminated textiles into your home

Clothes moths can easily find their way into your home via:

• Clothes bought in second-hand shops or flea markets, not washed before storage.
• Textiles that have been stored in the attic or basement for a long time.
• Rugs, throws, blankets or cushions picked up from a friend or relative.
• Textile items stored in boxes, which may harbour larvae.

Step 1: Treat textiles

If the fabric allows it, wash your clothes in the washing machine at 60°C.

The heat will destroy the larvae, mouthparts and eggs hidden in the fibres.

Instructions:

• Wash your infested clothes at a minimum temperature of 60°C (excluding wool).
• Then dry them in the tumble dryer at a high temperature for 30 minutes to complete the treatment.
• Iron if possible: the heat from the iron helps to eliminate any remaining larvae in the folds.

👉 Ideal for: cotton, sheets, towels, non-delicate clothing.

For wool, cashmere, silk or any delicate fabrics, opt for freezing.

Instructions for use:

• Place the garment in an airtight bag.
• Freeze at -20°C for at least 72 hours.
• Allow to return to room temperature without opening the bag to prevent condensation in the fibres.

1. Cloves

The strong smell of cloves repels moths.

How to use them:

• Place a small handful of cloves in a piece of gauze, a cotton bag or muslin.
• Place several of these in your cupboards, drawers, suitcases and dark corners.

⚠️ Avoid direct contact with delicate fabrics, as the cloves can leave a lingering odour.

3. Repellent essential oils

Certain essential oils are very effective as natural repellents:

• True lavender
• Peppermint
• Eucalyptus radiata

How to use them:

• Place a few drops on a cotton pad, porous pebble or small wooden disc.
• Place them in cupboards or drawers, without direct contact with your fabrics.
• Repeat every 2 to 3 weeks.

⚠️ Never apply essential oil directly to your clothes, as the stains are irreversible!

5. Pieces of Marseille soap

Marseille soap is a traditional repellent that is very effective against clothes moths.

How to do it:

• Cut a few pieces of dry soap.
• Place them in your wardrobes and drawers.
• Avoid direct contact with wool or silk to prevent the scent from becoming too strong.

Trichogramma wasps

Trichogramma wasps are tiny microscopic insects, completely harmless to humans, which parasitise moth eggs.

They prevent the larvae, which are responsible for holes in clothing, from hatching.

They disappear naturally after about ten days once the eggs have been consumed.

Trichogramma wasps are often sold in the form of small cards to hang up, which should be replaced every 2 to 3 weeks. You can place them near areas where moths lay their eggs: seams, corners, under shelves.

Step 1: Empty all infested cupboards and drawers

Start by emptying your cupboards and drawers completely, even if the infestation seems to be limited to a single packet. Food moths move quickly, lay their eggs in corners, and their larvae can hide in unexpected places.

Inspect each food item one by one.

Do not hesitate to throw away any suspicious food, especially dry goods that moths love:

• pasta
• rice
• flour
• cereals
• seeds and oilseeds
• dried fruit
• semolina
• breadcrumbs
• biscuits, cakes, chocolate

Good to know: even a sealed package can be infested. Packaging can be contaminated during the manufacturing process.

Wash surfaces with hot soapy water and then white vinegar

Use hot water + a few drops of washing-up liquid, then rinse. Leave to dry completely before applying white vinegar. 

How to use it:

• Mix 50% hot water + 50% white vinegar.
• Soak a sponge or cloth.
• Clean all surfaces: shelves, walls, undersides and tops of boards.

Step 4 – Freeze certain products

Freezing allows you to:

• kill any larvae still present,
• destroy eggs before they hatch,
• make food safe before putting it back in your cupboards.

If necessary, you can freeze all dry goods that tolerate cold temperatures well: cereals, seeds, almonds, nuts and other dried fruits, etc.

Place them in your freezer for at least 48 hours. Allow them to return to room temperature without opening the bag to prevent condensation. Then transfer the food to an airtight glass jar before storing it in your cupboards.

Grey moths in the kitchen

Adult moths resemble small brown-grey moths measuring approximately 1 cm.

You may see them:

• flying around lights in the evening,
• resting on cupboard walls,
• coming out of infested packages when they are moved.

They will readily enter poorly sealed jars, attracted by the smell of cereals and other starchy foods.