Pyralis farinalis

Linnaeus, 1758

meal moth

Pyralis farinalis, the meal , is a in the Pyralidae and the type species of its , tribe, , and family. are recognized by their colorful upperwings and characteristic resting posture with the held at 90° to the body. The species is strongly , associated with stored grain and food products worldwide, and completes its in approximately eight weeks with multiple per year. Larvae are significant pests of milled plant products, feeding on cereals, grains, and other stored foods.

Pyralis farinalis by (c) Annika Lindqvist, some rights reserved (CC BY), uploaded by Annika Lindqvist. Used under a CC-BY license.

Pyralis farinalis by no rights reserved, uploaded by Christian Kahle. Used under a CC0 license.

Pyralis farinalis dorsal by Simon Hinkley & Ken Walker, Museum Victoria. Used under a CC BY 3.0 au license.

Pronunciation

How to pronounce Pyralis farinalis: /pɪˈræ.lɪs fæ.rɪˈneɪ.lɪs/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

are distinguished from similar pyralid moths by the characteristic resting posture with raised at 90° to the body, combined with colorful upperwings. The wingspan of 18–30 mm provides a size reference. Larvae construct silk tunnels mixed with meal particles for shelter.

Images

Habitat

Primarily found in stored-product environments including grain silos, barns, warehouses, and food storage facilities. Occurs in poorly stored grain where moisture has infiltrated. Also found in accumulated vegetable refuse, detritus in almond orchards, and poultry manure. Outside anthropogenic settings, inhabits damp, moist plant debris.

Distribution

distribution worldwide. Found across the United States, especially along the eastern coast and in the Northeastern region. Present in Great Britain, the Falkland Islands, and China. Distribution limited by climatic factors that affect fungal and microbial growth required for larval development.

Seasonality

fly from June to August in temperate regions. The produces multiple per year due to rapid completion in approximately eight weeks.

Diet

Larvae feed primarily on milled plant products including cereals and grains. Observed feeding on all parts of grain plants including seed, bran, husk, and straw without preference. Also consumes potatoes and other vegetables. have short lifespans and likely do not feed extensively.

Life Cycle

are ellipsoid, wrinkled with lengthwise creases forming a reticulated pattern. Females lay 2–5 days after copulation; eggs hatch after nine days. Larvae construct silk tunnels mixed with meal particles for protection, feeding at tunnel openings. occurs in cocoons spun by mature larvae. emerge after 6–8 weeks total development time (60–65 days from oviposition). Mated adults live 9–10 days. Four can occur per year under favorable conditions.

Behavior

Larvae spend most of their time concealed in silk tunnels, emerging only to feed at openings. are short-lived after mating. Males have been observed attempting to mate with females of other (Amyelois transitella), attracted to shared components; these interspecific copulations are unlikely to produce viable offspring.

Ecological Role

Larvae serve as prey and for multiple antagonists including (Meteorus ictericus, Tetrastichus, Lespidea tarsalis, Apantales carpatus, Goniozus columbianus, Metacoelus mansuetos, Melanophora roralis) and . Larval shelters provide microhabitat structure that supports of associated arthropods in stored-product . Larval feeding contributes to decomposition and nutrient cycling in detritus .

Human Relevance

Major pest of stored grain and milled food products, capable of causing considerable damage to improperly stored crops. Used commercially in China as the main ingredient in "insect tea," a traditional beverage. Scientific studies have investigated optimal growth conditions for potential commercial . association with humans documented since the 18th century.

Similar Taxa

Amyelois transitella (navel orangeworm)Males of P. farinalis are attracted to and attempt to mate with females of this due to shared components, though the species are otherwise distinct in associations and .