Peridroma saucia

Adults distinguished from similar noctuids by combination of: (1) seven short black marks on forewings, (2) opalescent to white hindwings with brown venation, and (3) moderate size (43–50 mm wingspan). Larvae identified by: (1) yellow or white dorsal spots on first 4–6 abdominal segments, (2) black W-shaped mark on 8th abdominal segment of final instar, and (3) black line above spiracles. Similar to Agrotis and Euxoa cutworms but with distinctive spot pattern and W-mark.

Agricultural farmlands, gardens, orchards, and disturbed open habitats. Larvae found in soil, under debris, or on vegetation. Adults attracted to light. Greenhouse populations established where food is abundant. Overwintering range thought to extend from lower Mississippi valley to southern Great Plains in North America.

Nearly cosmopolitan: North America (southern Canada through United States, Mexico), South America, Europe (first recorded 1790), Asia (including Japan since 1970s, China, South Korea), Africa, and Hawaiian Islands. In North America, primarily inhabits southern Canada and northern United States, with seasonal migration to more northern areas.

Adults active May through November depending on location. Multiple generations per year: two generations in colder regions (e.g., Canada), three to four in warmer areas. Migratory populations move north in spring, return south in autumn. Larvae feed primarily at night; adults nocturnal.

Highly polyphagous. Larvae feed on vegetables (including potato, sugarbeet, tomato, cabbage, lettuce), fruits (including apple, peach, strawberry), field crops (wheat, corn, barley, oats, alfalfa, soybean, tobacco), and weeds (Datura, Rumex, Eupatorium capillifolium, Ambrosia, Capsella bursa-pastoris). Adults feed on nectar; documented as nocturnal pollinators of apple.

• Solanum tuberosum - larval food plantMajor crop pest
• Beta vulgaris - larval food plantLarvae consume up to 125 cm² of foliage
• Malus domestica - adult nectar source; larval food plantDocumented nocturnal pollination by adults; larvae climb trees to feed on foliage
• Glycine max - larval food plantOutbreaks cause 30–60% yield reduction
• Nicotiana tabacum - larval food plantSignificant pest in tobacco-growing regions
• Zea mays - larval food plantField crop host
• Triticum aestivum - larval food plantCereal crop host
• Prunus persica - larval food plantStone fruit host
• Fragaria - larval food plantSoft fruit host

Holometabolous with 2–4 generations annually. Egg stage: 4–6 days at 20–30°C, up to 10 days at 15°C; developmental threshold 3.0–6.0°C. Larval stage: six instars with total duration variable; developmental threshold 2.6–6.7°C. Pupal stage: 13 days at 25°C, 33 days at 15°C; developmental threshold 4.3–8.5°C; formed in soil. Adult longevity and fecundity temperature-dependent; females lay 1200–1400 eggs over lifetime, with higher total fecundity at 18–24°C than at 15°C due to extended oviposition period. Overwinters as larva or pupa; cannot survive more than 8 weeks at 0°C or 4 weeks at −2°C.

Nocturnal feeding by larvae, which hide in soil or under shelter during daytime and move to foliage at night. Larvae capable of climbing trees to access foliage. At high densities, larvae exhibit armyworm-like behavior, moving en masse between fields and causing extensive localized damage. Adults migratory, moving from southwest to northeast in warmer months; migration decreases under unfavorable conditions. Adults attracted to light. Female produces sex pheromone (Z)-11-hexadecenyl acetate as major component and (Z)-9-tetradecenyl acetate as minor component (3:1 ratio) to attract males.

Agricultural pest causing significant crop damage through larval defoliation and cutting of stems at soil surface. Documented as nocturnal pollinator of apple and potentially other crops. Serves as host for numerous parasitoid wasps and flies (Braconidae, Ichneumonidae, Eulophidae, Tachinidae), which account for majority of larval mortality. Functions as prey item in food webs, though specific predator documentation limited beyond parasitoids.

Major agricultural pest of vegetables, fruits, and field crops; described as one of the most damaging garden pests. Larval damage includes cutting plants at soil surface, defoliation, stripping of leaves and fruit, and bud/stem consumption. Control methods include insecticides, garden sanitation (weed and debris removal), physical barriers (trenches, tar bands, stem wraps), and biological control using poultry (turkeys, guinea hens). Subject of pheromone research for monitoring and potential mating disruption. Recent recognition of nocturnal pollination services complicates simple pest classification.

• Agrotis spp.Similar cutworm larvae and adult morphology; distinguished by larval spot pattern and adult hindwing coloration
• Euxoa spp.Similar life history and habitat; Euxoa auxiliaris (Army Cutworm) shares winter activity pattern but differs in larval markings and adult appearance
• Mythimna unipunctaArmyworm moth with similar nocturnal pollination behavior documented in same apple pollination study; distinguished by different larval morphology and adult wing pattern

• agricultural pest
• cutworm
• migratory
• polyphagous
• nocturnal pollinator
• Noctuidae
• pheromone-mediated mating

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• P.M. Pollinators: Study Shines Light on Nocturnal Insects' Role in Apple Production
• Bug Eric: National Moth Week 2024 Recap from Kansas City
• Peridroma saucia Archives - Entomology Today
• Bug Eric: Winter 'pillars
• Binding Mechanism of PsauPBP3 to Sex Pheromones in Peridroma saucia: Insights from Computational and Experimental Approaches.