Insect · Moderate risk
Indian Meal Moth
The Indian meal moth, often called the pantry moth, quietly settles into Quebec pantries. Its caterpillars chew through packages of cereal, flour and nuts, spin webbing inside them and contaminate your supplies long before you spot the moth.
8-10 MM · GREY AND COPPER WINGS
§1Distinctive features
How to identify it
The adult moth measures 8 to 10 mm and is recognizable by its two-tone wings: pale grey near the body, reddish copper at the tips. The caterpillars, creamy white with a brown head, reach 12 mm and leave silky threads behind them.
§2Habitat
Where to find it
It lives in the pantry, the spice cupboard and bags of pet food. You will also find it in cereal, flour, nuts, dried fruit and birdseed stored in the basement or garage.
§3Reproduction
Lifecycle
Without intervention, a new generation emerges every six to eight weeks in a heated kitchen.
§4What to look out for
Signs of infestation
- Small grey and copper moths flying in the evening near the cupboards
- Silky threads and sticky clumps in boxes of cereal or flour
- White caterpillars crawling on the ceiling or the cupboard frames
- Clumps, silky threads and droppings in dry foods
§5Why act fast
Risks
- Contamination of food: cereal, flour, nuts and spices unfit to eat
- Repeated food losses as the infestation spreads to every pantry shelf
- Webbing, shed skins and droppings that soil food, with rare but possible allergic reactions
§6Prevention
How to avoid it
- Transfer cereal, flour, rice and nuts into airtight containers
- Inspect packages when you buy them and freeze bulk foods at least four days at -18 °C
- Vacuum the corners, grooves and shelf-peg holes of the pantry
- Use up supplies first in, first out and date the containers
§7Pro method
How MW works
Inspection
Full inspection of the pantry, cupboards and storage areas to find the source and measure the extent of the infestation.
Preparation
Disposal of contaminated food and complete emptying of the shelves, then vacuuming of grooves, cracks and peg holes.
Treatment
Targeted treatment of cracks and non-food surfaces with approved products, combined with pheromone traps.
Follow-up
Follow-up after a few weeks to confirm the cycle has stopped, plus storage advice to prevent any reinfestation.
§8Your questions answered
Frequently asked questions
Are Indian meal moths a health hazard?
They do not bite and transmit no disease, but they contaminate food, which has to be thrown out.
How do Indian meal moths get into my kitchen?
They most often arrive in a package bought at the store. Inspect cereal, flour, nuts and pet food.
Do I have to throw out all the food in the pantry?
No, only the items where you see webbing, caterpillars or clumps. Opened foods with no visible sign can spend four days in the freezer as a precaution, then everything goes into airtight containers.
The Indian meal moth arrives in a bag of birdseed, flour or pet food, then spreads through the whole cupboard. We treat the cracks in the shelves, never the food. Our technicians work in kitchens and pantries in Longueuil, in Brossard, in Granby and in Sherbrooke, as part of our pest control service.
Sources used for this fact sheet: Espace pour la vie, Montréal Insectarium · Canadian Grain Commission · Canadian Food Inspection Agency · Colorado State University.
React quickly, sleep well.
The longer the infestation lasts, the more expensive it becomes.