Plodia interpunctella (Hübner)
Secondary pest: Grain feeder
- Adults have a wingspan of 14 to 20 mm and the body is 6 to 7 mm in length.
- Forewings are bicoloured with the base (part closest to body) cream to yellow and the outer portion coppery red to dark grey.
- Larvae are whitish though may have a greenish or pinkish tint depending on the larval food source.
- Larvae may be distinguished from Ephestia larvae by the lack of dark spots at the base of the setae (hairs).
- Larvae reach a length of 8 to 10 mm.
- Cereal products, oilseeds, cocoa, chocolate, spices, nuts, dried fruit, dried roots, herbs, tobacco, some pulses, dead insects
- Processed, packaged, manufactured foods, confectionary products
Signs of infestation
- Webbing of food surface
- Presence of frass (excrement), cast skins, pupal cases and dead adult moths
- Damage is caused only by larvae and is not distinctive.
- Only broken kernels of grain and grain dust are attacked as larvae cannot penetrate undamaged grain.
- Infested foodstuff is covered with silky webbing and frass from larvae.
- Webbing may clog machinery.
How to control
- Is found worldwide
- Is found coast to coast in Canada
- Is found in granaries, stores, elevators, warehouses
- May be encountered in manufacturing, distribution, retail and domestic environments
- Females lay eggs directly on the commodity, eggs are sticky.
- Pupation occurs in a silken cocoon on the surface of the food or nearby.
- Larvae can overwinter in unheated buildings.
- Life cycle will continue year round in heated buildings.
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Did you know?
The Indianmeal moth can take anywhere from 2 weeks to 2 years to reach maturity.
Video of the Indianmeal moth
Adult and larval Indian meal moths move across wheat kernels. The larvae move slowly while the adults crawl quickly.
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