Q: Why do I have maggots in my house?

We came home after a weekend vacation and found maggots all over the kitchen floor and on the tile floor in the family room. They’re about 1/2″ – 3/4″   inch long. I’ve found about 100 of them! Where did they come from and why are they in my clean house?

A:

If the “maggots” are limited to your kitchen, dining, pantry and immediately adjacent areas and are crawling on the floor, up walls and along ceilings, they are likely indianmeal moth (or Indian Meal Moth or Indian mealmoth) larvae. The other white worms (in that size range) that can be found in kitchens are fly maggots, but those do not have legs. Maggots wiggle along; they can’t crawl. Indianmeal moth larvae have a brown head while fly larvae have no noticeable head. Indianmeal moth larvae have the typical caterpillar shape, but they are small (about ½ inch long, as you said) and almost hairless. You should have a pest control company confirm the identification though.

Indian Meal Moth Larvae not a Maggot

Indian Meal Moth Larvae aka Pantry Moth Larvae are often confused with fly maggots

The reason the larvae are crawling around your kitchen is that they are fully grown and are looking for protected places to pupate so they can turn into adult moths. They have the habit of leaving the food in which they have been feeding (probably on your kitchen shelves or in the pantry) when ready to pupate. They usually crawl upward, often ending up in a wall/ceiling corner or a crack, where they spin a silken cocoon. Sometimes they will pupate at the top of the same cabinet where they have been feeding, or even in the food material itself.

The tricky part, once you have confirmed that they are Indianmeal moth larvae, is finding out where they came from. You’ll probably need a pest control expert’s help here, too, since Indianmeal moth larvae can feed on many different things and you may have multiple infested sites.

3 TIPS ON HOW TO FIND WHERE THEY CAME FROM

Here are a few tips on how to find the moth larvae infestation sites:

  • Check “old” foods first, those boxes and bags that are rarely used, have been on the back of the shelf for a long time, or are past their use-by date. Keep in mind that Indianmeal moths can be found infesting even unopened packages.
  • The most common infestation site for Indianmeal moth larvae in homes is dry pet food, which may or may not be stored in the kitchen. Other most likely food sources are coarse-milled grain products like cornmeal (Indian meal), wheat or graham four, or cereals.
  • Infested foods will be covered with irregular silken webbing spun by the feeding larvae. You may also find larvae, shed skins, droppings, even adult moths in the food package. If you think about it, you might realize that you have been seeing some small moths fluttering around near your kitchen.

Even after you find and discard the infested foods, there’s the chance that adult moths may have laid eggs in other food products. So any susceptible foods should be thrown out or at least stored in airtight containers. Your pest control technician can treat shelves and other areas to kill any new larvae that may hatch, and can advise you on how to “moth-proof” your kitchen and pantry.