How Quickly Can Carpet Moths Damage a Carpet in Cookham?

The Underlying Rate

• Egg to hatch: one to three weeks
• Larva: two to three months of feeding, longer in a cool room. The only damaging stage
• Pupa: a couple of weeks
• Adult: a few weeks, no feeding at all

One larva consumes very little. Visible damage anywhere means several generations have run in the same place, which is why the honest answer to 'how quickly' is always 'slowly, then all at once'.

But Visibility Varies Hugely By Material

1. Wool carpet pile. Damage shows relatively early — grazed, thinning patches you can see once the furniture moves. Six to twelve months to be obvious
2. Wool-mix carpet. Slower to look wrong, because the synthetic threads stay and the area reads as premature wear rather than damage
3. Felt underlay. Never visible from above at all. Can run indefinitely with an undamaged carpet on top
4. Curtain hems. Slow to notice, because nobody examines the bottom of a curtain, and the damage is often on the lining side
5. Inside upholstery. Effectively invisible until a cover comes off or a seam goes. This is the extreme case
6. Rugs. The underside goes first, so a rug can look perfect and be substantially gone

What Speeds It Up

• Warmth — a consistently heated house runs generations back to back through the winter
• Stillness — nothing disturbed, nothing vacuumed
• Soiling — body oils, food traces and pet hair make fibre more attractive than clean fibre
• A concentrated food source, such as horsehair filling or felt underlay
• Enclosure, which removes light, air and any possibility of disturbance

How To Get a Signal Off the Invisible Places

1. Monitoring traps. They do not care what material the population is on — they measure adults, which is the one thing every food source produces
2. Turn one piece of upholstery over every few months
3. Handle the curtain hems — run them through your hands and look at the lining side
4. Lift a carpet corner somewhere it will not show and check the underlay
5. Mark and date any patch you find so growth can be measured

Treatment starts from £220. If the carpet looks fine and you are still seeing moths, that is a meaningful piece of information rather than a puzzle — it says look at the soft furnishings.