Pyralis farinalis (L.)
Secondary pest: Grain feeder
- Adults are relatively large with a wingspan of 22 to 30 mm and a body length of 7.5 to 15 mm.
- Forewing is distinctly patterned with a pale or tan centre bordered by a reddish base and apex. The centre is bordered by a wavy white line.
- Hhind-wing is also patterned.
- Larvae are whitish in colour with a dark head capsule and prothoracic segment.
- Larvae do not haveblack spots on their bodies.
- Wheat, barley, oats, corn, peas, beans, flour, peanuts, dried fruit, potatoes in storage, mixed feed, processed cereals, hay (alfalfa and clover)
Signs of infestation
- Contamination with silk webbing
- Presence of frass (excrement), cast skins, pupal cases, adult remains
- Damage is caused by larval feeding and is not distinctive.
- Larvae produce silk webbing that can bind the food surface.
- Irregular holes are chewed into attacked material.
How to control
- Is found worldwide but is more common in temperate regions
- Is found across Canada
- Is able to survive winters in unheated granaries
- Is found in grain elevators, mills, processing facilities, warehouses, grain ships, households
- Is a minor pest of coarsely ground cereal products
- Is most abundant in mouldy grain, decaying cereals and cereal products that have a high moisture content
- May be thought of as an indicator of poor sanitation
- Females lay ggs randomly amongst the food source.
- Larvae actively leave commodity to search for a site for pupation that occurs in a silken cocoon.
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