Indian meal moth adults have a 5/8″ to ¾” wingspan. The wings are a copper brownish colour with a grey band near where the wings attach to the body. The larvae are about ½” long and dirty white in colour. The head is a reddish-brown colour.
Adult females lay 100-400 eggs at night over a period of about 18 days. The larval development requires 13- 288 days. The average life cycle, egg to egg, requires 25- 135 days. There are usually 6 generations per year.
Indian meal moths infest common stored products such as whole grains, dried fruit, nuts, chocolate, beans, crackers, biscuits, dried dog food, bird seed and red peppers. The larvae produce silk webbing over the surface of the materials upon which they are feeding.
The larvae move into cracks and crevices in the food material, feeding within or near this silken mat. The mature larvae often move away from the infested materials to pupate in cracks and crevices. This behavioural pattern often allows them to be discovered by homeowners.
All infested items must be discarded and all uninfected products should be placed in insect-proof containers. Shelves and cupboards should be thoroughly vacuumed and treated with a residual pesticide. Pheromone traps can be used to help locate areas of activity.
Adult case making clothes moths are approximately 3/8 to ½ inch from wing tip to wing tip. The wings and body are buff to golden with a brown tinge, and the front wings have three dark spots. However, these distinguishing characteristics are often rubbed off.
The larvae are small caterpillars, 3/8 inch long in size, that live within a small portable, silken case. The larvae have dark head capsules and the first thoracic segment is dark brown or black.
Female clothes moths begin laying eggs (37-48) singly on suitable larval food the day after emerging as an adult. The larva feeds for about 33-90 days and moults 5-11 times.
The insect then pupates within the silken larval case. Development time from egg to adult requires 46-116 days. Adults may lay eggs year-round in northern areas, but have only one generation per year.
The clothes moths prefer products of animal origin, secondarily feeding on products of plant origin. It is a pest of woollens, rugs, feathers, felts, skins, drugs, furs, and stored tobacco.
Case making clothes moths shun the light, and although the males are active fliers, the females fly only short distances.
The key to controlling this pest is through thorough inspection and identification of infested materials. Infested rugs, carpets, and furniture should be cleaned thoroughly and protected with a residual insecticide application. Larvae are easily removed from infested clothing by cleaning or laundering.
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