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Montana Field Guide

Montana Field Guides

Cabbage White - Pieris rapae

Non-native Species

Global Rank: G5
State Rank: SNA

Agency Status
USFWS:
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General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002] Forewing 2.1-2.8 cm. White overall. Uppersurface of forewing with charcoal to black tip and one (male) or two (female) postmedian black spots, one spot on leading edge of hindwing. Undersurface uniformly white with yellowish tint, prominent black spot on forewing with smaller adjacent spot, no marbling or markings tracing hindwing veins.

Phenology
Many flights, mid-April to October in the north; one flight, mostly June in far north (Scott 1986). Continuous flights from early spring to killing frost (Glassberg 2001). March to first killing frost of autumn in the Rocky Mountain states (Ferris and Brown 1981). Early April to early October in south-central Colorado (Scott and Scott 1978), early March to early November in Oregon and Washington (Pyle 2002), late February to mid-October in Oregon (Warren 2005), March to November in British Columbia (Threatful 1988; Guppy and Shepard 2001).

Diagnostic Characteristics
Best determined by charcoal to black wing tip and overall white color on upper surface, with one or two prominent postmedian black spots, undersurface uniformly white with yellowish tint, prominent black spot on forewing and no marbling or markings tracing veins of hindwing.

Species Range
Montana Range

Non-native
 


Range Comments
Holarctic; introduced to North America. In NA across Canada from the southern boreal regions south throughout the US to northern Mexico; wanders farther north to southeastern Alaska, the northern regions of British Columbia, Alberta, Saskatchewan, Manitoba, Ontario (Scott 1986; Opler and Wright 1999; Glassberg 2001); 1310 m to at least 2743 m elevation in Colorado (Scott and Scott 1978), sea level to at least 2438 m elevation in Oregon (Warren 2005), 456 m to 549 m elevation in southeastern British Columbia (Threatful 1988). In Montana, reported from all counties (Kohler 1980; Stanford and Opler 1993; FLMNH Lepidopterists' Society database). Mainly uncommon to common, rare at southern edge of range (Glassberg 2001).

Observations in Montana Natural Heritage Program Database
Number of Observations: 32

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Migratory in Europe, non-migratory in North America; adults move up to 12 km but mostly < 1 km (Scott 1986).

Habitat
Open disturbed sites, cities, suburbs, vegetable gardens, valley bottoms, montane meadows, streamsides, desert washes, roadsides, commercial cropland (Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002). In Glacier National Park, Montana reported from montane mesic meadows and above treeline in alpine terrain (Debinski 1993); in the Greater Yellowstone Ecosystem, reported in open woodlands, roadsides, agricultural areas (Debinski and Pritchard 2002).

Food Habits
Larval food plants are primarily those containing mustard oils, and include commercial crop species and natives such as Arabis, Armoracia, Barbarea, Brassica (many species), Caulanthus, Cakile, Capparis, Cardaria, Capsella, Cleome, Dentaria, Descuraina, Eruca, Erysimum, Hesperis, Lepidium (several species), Lobularia, Lunaria, Malcolmia, Matthiola, Nasturtium, Raphanus, Reseda, Rorippa, Sisymbrium (several species), Streptanthus, Thlaspi, and Tropaeolum (Emmel et al. 1970; Scott 1986, 1992, 2006; Guppy and Shepard 2001; Warren 2005). Adults feed on flower nectar (including Agalinis, Agastache, Anchusa, Apocynum, Arctium, Asclepias, Barbarea, Berteroa, Bidens, Blephilia, Boltonia, Brassica, Brickellia, Buddleia, Cardamine, Carduus, Caryopteris, Centaurea, Centranthus, Cephalanthus, Cerastium, Chrysanthemum, Chrysothamnus, Cirsium, Cleome, Convolvulus, Conyza, Coreopsis, Cornus, Coronilla, Crotalaria, Cryptantha, Cucumis, Cucurbita, Cuphea, Delphinium, Dipsacus, Epilobium, Erigeron, Eriodictyon, Erythronium, Eupatorium, Fragaria, Gazania, Geranium, Glechoma, Grindelia, Helianthus, Hesperis, Heterotheca, Justicia, Lactuca, Lavandula, Lepidium, Lesquerella, Liatris, Linaria, Lithospermum, Lobelia, Lycium, Lythrum, Machaeranthera, Malva, Matricaria, Medicago, Mentha, Mertensia, Monarda, Nasturtium, Nepeta, Nothoscordum, Origanum, Oxalis, Perovskia, Phaseolus, Plantago, Polygonum, Potentilla, Prunella, Pycnanthemum, Ranunuculus, Raphanus, Ribes, Rubus, Rudbeckia, Salvia, Scabiosa, Sedum, Senecio, Sisymbrium, Sium, Solanum, Solidago, Stachys, Symphyotrichum, Syringa, Taraxacum, Teucrium, Thlaspi, Trifolium, Triodanis, Verbena, Veronica, Viguiera, Viola, Zinnia) and mud (Scott 1986, 2014; Pyle 2002; Tooker et al. 2002; Warren 2005).

Reproductive Characteristics
Females lay eggs singly on host plant leaves; lifetime fecundity varies from about 100-750 eggs. Females may live about 21 days in captivity, usually < 7 days in the wild (Scott 1986, 1992, 2006; James and Nunnallee 2011). Eggs hatch in about 3-5 days (depending on temperature and cohort), develop from egg-hatch to L5 instar and pupae in 14-21 days, adults eclose (emerge from pupae) in 7-12 days. Temperature and photoperiod determine production of diapause or non-diapause larvae, temperature > 24 C prevents diapause regardless of day length (James and Nunnallee 2011). Young larvae move little, feed mostly on underside of host plant leaves, build no nest; older larvae more mobile, are cannibalistic on eggs, hibernate as pupae (Scott 1979, 1986; James and Nunnallee 2011). Males patrol throughout the day near larval host plants in riparian areas or in cultivated fields in search of females (Scott 1975b, 1986).

References
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Citation for data on this website:
Cabbage White — Pieris rapae.  Montana Field Guide.  .  Retrieved on , from