Moths, And The Damage Done While Clothes Hang

Moth damage appears suddenly and has usually been developing for months. Understanding what the larvae eat and what draws them explains why some garments are targeted and others ignored.

The larvae do the damage, not the moths

Adult clothes moths do not feed on fabric at all. They exist to reproduce, and the eggs they lay hatch into larvae that eat keratin from wool, silk, cashmere and feathers.

This is why seeing adults is a late signal. By the time they are flying, a generation has already fed somewhere in the wardrobe and pupated.

Synthetic and plant fibres are not eaten. Damage to a cotton-wool blend follows the wool content, which is why blends show scattered rather than concentrated holes.

Residue is the attractant

Larvae are drawn to fibres carrying body oils, perspiration, food traces and hair products. Clean wool is far less appealing than the same wool worn twice and put away.

This explains the common pattern of damage at collars, cuffs and underarms. Those are the areas with the heaviest residue, not the areas with the most fibre.

The practical consequence is that washing before storage is the single most effective preventive step. It removes the signal that identifies a garment as food.

They prefer stillness and darkness

Clothes moths avoid light and disturbance. Infestations establish in the parts of a wardrobe that are not touched: back corners, stored boxes, undisturbed folded stacks.

Garments in regular rotation are rarely damaged, which is why the problem shows up on seasonal storage. The clothing was out of sight for months.

Moving and airing stored items periodically disrupts the cycle without any treatment. It also gives an opportunity to spot early damage while it is still repairable.

Deterrents work differently from treatments

Cedar and lavender are repellents at best. They may discourage adults from laying but do not kill larvae already present, and cedar loses effect as its oils dissipate.

Freezing kills eggs and larvae if the temperature is low enough and held long enough, with a return to room temperature and a second freeze catching survivors.

Heat achieves the same result, which is why a hot wash or a hot tumble clears an affected garment where the fabric permits it. For wool, freezing is usually the safer route.

Containment is what stops recurrence

Treating one damaged jumper while leaving the rest of the wardrobe untouched fails, because the population is distributed. The wardrobe has to be handled as a unit.

That means emptying it, cleaning the interior including corners and seams of drawers, and dealing with every protein-fibre garment before anything goes back.

Once cleared, sealed breathable storage for the items not in rotation is what keeps it cleared. The routine is tedious once and then reduces to the seasonal handover.