The cabbage white butterfly (Pieris rapae), also known as the cabbage butterfly and the imported cabbageworm, is so named because the larval stage feeds on members of the cabbage family (Cruciferae). This species is found around the world in temperate climates. It was introduced to North America in the 1860's and has since spread throughout the continent. The cabbage white butterfly is known to pollinate several species in the United States.
The cabbage white butterfly has a black body with white wings. The upper wings have a black band at the tip and a black spot in the center of each upper wing. Males have one spot on each wing and females have two. The underneath of the wings are yellowish-green. These butterflies have a wingspan of 30 to 50 mm. Caterpillars are green or bluish-green with a light yellow stripe.
North American Ecology (US and Canada)
Size: 46-55 mm. A small version of Pieris brassicae.
occurs (regularly, as a native taxon) in multiple nations
Regularity: Regularly occurring
Type of Residency: Year-round
Regularity: Regularly occurring
Type of Residency: Year-round
Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) Introduced into North America south of the Arctic. Rare in southern Florida and in southern Gulf states. Also occurs in Africa, Eurasia, and Japan.
61 records. Latest in 2006 (oases)
Distribution in Egypt
Widespread. AOO = 184 km2. EOO = 243,000 km2. 9 locations
Widespread (Palaearctic; introduced worldwide)
Comments: Mostly disturbed open areas but also invading natural situations. In wooded areas mostly in spring before the canopy closes but seems to be becoming more forest adapted as garlic mustard increases explosiovely in the East.
Always associated with cultivation.
Non-Migrant: No. All populations of this species make significant seasonal migrations.
Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: No. No populations of this species make annual migrations of over 200 km.
Host-plants: Cultivated brassicas (Cruciferae), especially cabbages; nasturtiums (Tropaeoleum majus) in gardens; wild crucifers and Reseda lutea (Resedaceae).
Flowering Plants Visited by Pieris rapae in Illinois
(observations are from Robertson, Graenicher, Wiggam & Ferguson, Betz et al., Hilty, Lewis, Catling, Larson & Barrett, Conger, and Willson & Bertin; this butterfly is the Cabbage White)
Acanthaceae: Justicia americana sn (Rb, Cng); Apiaceae: Sium suave sn (Rb); Asclepiadaceae: Asclepias incarnata [plpr sn] [plup sn] (Rb, Btz), Asclepias verticillata [plab sn] [plup sn fq] (Rb, WB); Asteraceae: Anthemis cotula sn (Gr), Arctium lappa sn (Gr), Arctium minus sn (Rb), Aster anomalus sn (Rb), Aster drummondii sn (Gr), Aster ericoides sn (Rb), Aster furcatus sn (Gr), Aster laevis sn (Gr), Aster lanceolatus sn (Rb, Gr), Aster lateriflorus sn (Gr), Aster novae-angliae sn (Gr), Aster pilosus sn (Rb, H), Aster prenanthoides sn (Gr), Aster puniceus sn (Gr), Bidens aristosa sn (Rb), Bidens bipinnata sn (Rb), Boltonia asterioides sn (Rb), Cirsium altissimum sn (Gr), Cirsium arvense sn (Gr), Coreopsis palmata sn (Rb), Echinacea purpurea sn (Rb), Eupatoriadelphus purpureus sn (Rb, Gr), Eupatorium perfoliatum sn (Gr), Eupatorium serotinum sn (Rb), Euthamia graminifolia sn (Gr), Helenium autumnale sn (Gr), Helianthus annuus sn (Rb), Helianthus giganteus sn (Gr), Helianthus strumosus sn (Gr), Leucanthemum vulgare sn (Lw), Liatris aspera sn (H), Liatris pycnostachya sn (Rb), Liatris spicata sn (Gr), Oligoneuron rigidum sn (H), Rudbeckia hirta sn (Rb), Silphium integrifolium sn (H), Silphium perfoliatum sn (Rb), Vernonia fasciculata sn (Rb); Boraginaceae: Buglossoides arvense sn (H), Lithospermum canescens sn (Rb); Brassicaceae: Barbarea vulgaris sn (H, Lw), Cardamine bulbosa sn (Rb); Campanulaceae: Lobelia spicata sn (Rb), Triodanis perfoliata sn (Rb, Lw); Caryophyllaceae: Stellaria media sn (Lw); Fabaceae: Crotalaria sagittalis sn np (Rb), Lotus corniculatus sn np (Lw), Trifolium pratense sn (Rb, Lw), Trifolium repens sn (Rb, Lw); Fumariaceae: Dicentra cucullata sn np (Rb); Lamiaceae: Agastache nepetoides sn (Rb), Blephilia ciliata sn (Rb), Blephilia hirsuta sn (Rb), Glechoma hederacea sn np (Rb), Mentha arvensis sn (Rb), Nepeta cataria sn (Rb), Prunella vulgaris sn (Rb, Lw), Pycnanthemum pilosum sn (H), Pycnanthemum tenuifolium sn (Rb), Scutellaria incana sn np (H), Teucrium canadense sn (Cng); Liliaceae: Allium cernuum sn (Gr), Erythronium albidum sn (Rb), Nothoscordum bivalve sn (Rb), Smilacina stellata sn (Gr), Tofieldia glutinosa sn (Gr); Lythraceae: Lythrum alatum sn (Rb); Malvaceae: Abutilon theophrastii sn (Rb), Hibiscus trionum sn (Rb), Malva neglecta sn (Rb), Sida spinosa sn fq (Rb); Melastomataceae: Rhexia virginica exp np (LBt); Orchidaceae: Spiranthes lacera sn np (Ct); Oxalidaceae: Oxalis corniculata sn (Rb), Oxalis stricta sn (Rb, Lw); Papaveraceae: Sanguinaria canadensis exp (Gr); Parnassiaceae: Parnassia glauca sn (Gr); Polemoniaceae: Phlox divaricata laphamii sn (WF); Polygonaceae: Fallopia scandens sn (Rb), Persicaria pensylvanica sn (Rb); Portulacaceae: Claytonia virginica sn (Rb); Rosaceae: Fragaria virginiana sn (Rb), Potentilla argentea sn (Lw), Potentilla recta sn (Lw); Rubiaceae: Cephalanthus occidentalis sn (Rb), Houstonia lanceolata sn (Rb); Scrophulariaceae: Agalinis tenuifolia sn np (Rb), Dasistoma macrophylla sn np (Rb), Linaria vulgaris sn np (Rb), Veronicastrum virginicum sn (Rb); Verbenaceae: Verbena stricta sn fq (Rb, H), Verbena urticifolia sn (Rb); Violaceae: Viola cucullata sn (Rb), Viola pedata sn (Rb)
larva of Compsilura concinnata is endoparasitoid of larva of Pieris rapae
Animal / parasitoid / endoparasitoid
larva of Epicampocera succincta is endoparasitoid of larva of Pieris rapae
Animal / parasitoid / endoparasitoid
larva of Phryxe vulgaris is endoparasitoid of larva of Pieris rapae
Foodplant / internal feeder
caterpillar of Pieris rapae feeds within live heart of Brassica oleracea var. capitata
Number of Occurrences
Note: For many non-migratory species, occurrences are roughly equivalent to populations.
Estimated Number of Occurrences: 81 to >300
10,000 to >1,000,000 individuals
Life History and Behavior
The Flight Period
Two or more generations per year.
These butterflies are one of the first to be seen in the spring and one of the last to be seen in the fall. These butterflies can fly from February to mid-November; they have a shorter season in their northern range and a longer season in the south. Females produce between 300 and 400 eggs; each is laid singly on the underside of host plants. Caterpillars hatch and feed on plants from the cabbage family (Brassicaceae). They then molt five times before turning into a chrysalis. Chrysalids hibernate and hatch into adult butterflies. Adults live about three weeks. Cabbage white butterflies have between two and eight generations per year.
Evolution and Systematics
The wings of the cabbage butterfly are white due to longitudinal ridges and cross-ribs studded with ovoid beads.
"The small white, P. [Pieris] rapae, offers an interesting example of the biology of wing coloration. Both sexes of this butterfly species are rather featureless for human eyes, except for slight differences in the black spots, small wing areas where the wing scales contain melanin. The white color is caused by strongly scattering structures in the wing scales (Stavenga et al., 2004). The reflectance is only high above 450 nm, but it is minor below 400 nm, because the scales of male P. rapae crucivora contain a substantial amount of UV-absorbing pteridins." (Stavenga and Arikawa 2006:314)
"Fig. 7. Coloration of pierid butterflies...(b) The wing scales are marked by longitudinal ridges and cross-ribs. (c) The cross-ribs are studded with ovoid beads...(d) The wing scales strongly scatter, but due to pteridin pigment, which strongly absorbs in the UV, the reflectance is low in the UV." (Stavenga and Arikawa 2006:315)
Learn more about this functional adaptation.
- Stavenga, D.G.; Arikawa, K. 2006. Evolution of color and vision of butterflies. Review. Arthropod Structure & Development. 35: 307-318.
Molecular Biology and Genetics
Barcode data: Pieris rapae
Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.
See the BOLD taxonomy browser for more complete information about this specimen and other sequences.
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Download FASTA File
Statistics of barcoding coverage: Pieris rapae
Public Records: 127
Specimens with Barcodes: 342
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: NNA - Not Applicable
Rounded National Status Rank: NNA - Not Applicable
NatureServe Conservation Status
Rounded Global Status Rank: G5 - Secure
Status in Egypt
Resident and migrant
Degree of Threat: D : Unthreatened throughout its range, communities may be threatened in minor portions of the range or degree of variation falls within natural variation
Global Protection: Many to very many (13 to >40) occurrences appropriately protected and managed
Needs: None, widespread common economic pest.
Relevance to Humans and Ecosystems
Recent research has shown that it is actually four times more efficient at pollinating wild radish (Raphanus raphanistrum) than honey bees (Apis mellifera) because honey bees are foraging for both pollen and nectar and most likely groom away pollen from their bodies. In addition to wild radish, cabbage white butterflies are pollinators of red clover (Trifolium pratense), common dandelion (Taraxacum officinale), black-eyed susan (Rudbeckia hirta), buttonbush (Cephalanthus spp.), bird's-foot violet (Viola pedata), and wild strawberry (Rosaceae).
In addition to being pollinators, this species can be considered a pest because the larvae feed on the foliage of crop plants like broccoli, Brussels sprouts, cabbage, cauliflower, collard, horseradish, kale, and kohlrabi. Larvae of this species have the ability to reduce mature plants to stems and large veins by eating foliage. Larvae have also been known to burrow into the heads of broccoli and cabbage; they are difficult to dislodge and produce large amounts of fecal material.
Pest of brassica crop
The small white (Pieris rapae) is a small- to medium-sized butterfly species of the whites-and-yellows family Pieridae. It is also known as the small cabbage white and in New Zealand, simply as white butterfly. The names "cabbage butterfly" and "cabbage white" can also refer to the large white. The butterfly can be distinguished by the white color with small black dots on its wings. They are distinguished from the smaller size and lack of the black band at the tip of their forewings.
It is widespread and populations are found across Europe, North Africa, Asia, and Great Britain. It has also been accidentally introduced to North America, Australia and New Zealand. The caterpillar of this species is seen as a pest for commercial agriculture. Often referred to as the "imported cabbageworm" they are a serious pest to cabbage and other mustard family crops.
- 1 Description
- 2 Distribution and habitat
- 3 Life cycle
- 4 Behavior and ecology
- 5 Predation
- 6 References
- 7 Further reading
- 8 External links
In appearance it looks like a smaller version of the large white (Pieris brassicae). The upperside is creamy white with black tips on the forewings. Females also have two black spots in the center of the forewings. Its underwings are yellowish with black speckles. It is sometimes mistaken for a moth due to its plain appearance. The wingspan of adults is roughly 32–47 mm (1.25–2 in).
Distribution and habitat
The species has a natural range across Europe, Asia, and North Africa. It was accidentally introduced to Quebec, Canada around 1860 and spread rapidly throughout North America. The species has spread to all of North American life zones from Lower Austral/Lower Sonoran to Canada. Estimates show that a single female of this species might be the progenitor in a few generations of millions. It is absent or scarce in desert and semidesert regions (except for irrigated areas). It is not found north of Canadian life zone, nor on Channel Islands off the coast of southern California. By 1898, the small white had spread to Hawaii; by 1929, it had reached New Zealand  and the area around Melbourne, Australia and found its way to Perth as early as 1943.
In Britain, it has two flight periods, April–May and July–August, but is continuously-brooded in North America, being one of the first butterflies to emerge from the chrysalis in the spring and flying until hard freeze in the fall.
The species can be found in any open area with diverse plant association. It can be seen usually in towns, but also in natural habitats, mostly in valley bottoms. Although an affinity towards open areas is shown, the small white is found to have entered even small forest clearings in recent years.
The nominate subspecies P. r. rapae is found in Europe, while Asian populations are placed in the subspecies P. r. crucivora. Other subspecies include atomaria, eumorpha, leucosoma, mauretanica, napi, novangliae, and orientalis.
The small white will readily lay eggs on both cultivated and wild members of the cabbage family, such as Charlock (Sinapis arvensis) and Hedge mustard (Sisymbrium officinale). P. rapae is known to lay eggs singly on the host plant. The egg is characterized by a yellowish color and 12 longitudinal ridges. The egg production peaks about a week after adulthood in lab and the female can live up to 3 weeks. Females tend to lay fewer eggs on plants in clumps than on isolated plants. It has been suggested that isothiocyanate compounds in the family Brassicaceae may have been evolved to reduce herbivory by caterpillars of the small white. However, this suggestion is not generally accepted because the small white has later been shown to be immune to the isothiocyanate forming reaction due to a specific biochemical adaptation. In contrast, the small white and relatives seem to have evolved as a consequence of this biochemical adaptation to the isothiocyanate-forming glucosinolates.
Traditionally known in the United States as the imported cabbage worm, now more commonly the cabbage white, the caterpillars are bluish-green, with tiny black pints, a black ring around the spiracles, and a lateral row of yellow dashes, and a yellow middorsal line. Caterpillars rest on the undersides of the leaves, making them less visible to predators. Although the larval instars have not been fully studied, different instars are easily differentiated simply by comparing sizes, especially the head alone. During the first and second instar the head is entirely black; third instar has the clypeus yellow but the rest of the head black. In the fourth and fifth instar, there is a dark greenish-yellow dot behind each eye but with rest of the head black. However, the color of the caterpillar head does not necessarily indicate specific instar, as the time of color change is not fixed. In the larval stage, the small white can be a pest on cultivated cabbages, kale, radish, broccoli, and horseradish. The larva is considered a serious pest for commercial growth of cabbage and other Brassicaceae.
The pupa of P. rapae is very close to that of P. napi. It is brown to mottled-gray or yellowish, matching the background color. It has a large head cone, with a vertical abdomen and flared subdorsal ridge. The two (pupa of P. rapae and P. napi) can be easily distinguished by comparing the proboscis sheath. In P. rapae, the proboscis sheath extends far beyond the antennal sheath while in P. napi, only a very short distance.
Like its close relative the large white, the small white is a strong flyer and the British population is increased by continental immigrants in most years. Adults are diurnal and fly throughout the day, except for early morning and evening. Although there is occasional activity during the later part of the night, it ceases as dawn breaks. Adult P. rapae can move many kilometers in individual flights. Adults have been observed to fly as much as 12 km in one flight. On average, a female flies about 0.7 km per day and moves 0.45 km from where she starts. Males patrol all day around host plants to mate with females.
Behavior and ecology
Courtship and reproduction
The male, when it spots a female, zigzags up, down, below, and in front of her, flying until she lands. The male flutters, catches her closed forewings with his legs, and spreads his wings. This causes her to lean over. He usually flies a short distance with her dangling beneath him. An unreceptive female may fly vertically or spread her wings and raise the abdomen to reject the male. Most host plants of P. rapae contain mustard oils and females use these oils to locate the plants. Females then lay the eggs singly on host leaves. Adults appear as early as March and they continue to brood well into October. Spring adults have smaller black spots on its wings and are generally smaller than summer adults.
P. rapae larva is voracious. Once it hatches from the egg, it eats its own eggshell and then moves to eat the leaves of the host plant. It bores into the interior of the cabbage, feeding on the new sprouts. The mustard oil from the hostplant makes the larvae distasteful to the bird. The larva adjust their feeding rate to maintain a constant rate of nitrogen uptake. They will feed faster in low nitrogen environment and utilize the nitrogen more efficiently (at the cost of efficiency in other nutrients) than larvae hatched on nitrogen high hostplant. However, no significant difference in growth rate was observed between larvae in the two environments. Considered a serious pest, the caterpillar is known to be responsible for annual injury of hundreds of thousands of dollars.
The larvae is shown to disperse their damage on the plant. Larvae is shown to feed mostly during the day. It moves around the plant mostly spending its time feeding. A feeding bout is immediately followed by a change in position, either to a new leaf or to another part of the same leaf. This dispersal of damage is seen as an adaptive behavior to hide the visual cues from predators that rely on vision. Even though P. rapae larvae are cryptic, they remain in the sun for the majority of the day, rather than hiding in the underside of the leaf. The condition of the host plant influences the larvae growth significantly.
Larval duration, pupal weights, adult weights, and larval growth rates were significantly altered by both plant nutrient availability and plant species. Larvae preferred Brassicaceae plants over other host plants. Larvae that have previously fed on crucifers will refuse nasturtium leaves to the point of starving to death. Within the Brassicaceae family, larvae show no significant difference in feeding behavior; larvae placed on kale show no difference from larvae placed on Brussels sprouts.
Survival rates do not differ depending on nutrition availability of host plant. Elevated plant nutrient levels decrease larval duration and increase larval growth rate. The elevated nutrition level also decreased the fourth instar’s consumption rate and increased its food utilization efficiencies. Larvae on cultivated host plant was observed to have higher growth efficiency than those fed in foliage of wild species. In short, larvae fed on high nutrition foliage show shorter duration of development, less consumption rate, higher growth rate and food processing efficiency.
Adult P. rapae use both vision and olfactory cues to identify flowers in their foraging flight. The cabbage butterfly prefers purple, blue and yellow flowers over other floral colors; visiting these flowers multiply during its life. Some flowers, like Brassica rapa, have a UV guide for aiding nectar search for the butterfly where the petals reflect near UV light whereas the center of the flower absorbs UV light, creating a visible dark center in the flower when seen in UV condition. This UV guide plays a significant role in P. rapae foraging.
The adult flies around feeding from nectars of the plant. The adult looks for certain colors among green vegetation (purple, blue, and yellow preferred to white, red and green) and extend the proboscis before landing. They probe for nectar after landing. The butterfly identifies the flower through vision and odor. Chemical compounds such as Phenylacetaldehyde or 2-Phenylethanol was shown to provoke reflex proboscis extension. The search for nectar is also limited by the memory constraint. An adult butterfly shows a flower constancy in foraging, visiting flower species that it has already experienced. The ability find nectar from the flower increased over time, showing a certain learning curve. Furthermore, the ability to find nectar from the first flower species decreased if the adult butterfly started to feed nectar from other plant species.
All known host plants contain natural chemicals called glucosinolates, that are cues for egg laying. Host plants are: herb Cruciferae – Arabis glabra, Armoracia lapthifolia, Armoracia aquatica, Barbarea vulgaris, Barbarea orthoceras, Barbarea verna, Brassica oleracea, Brassica rapa, Brassica caulorapa, Brassica napus, Brassica juncea, Brassica hirta, Brassica nigra, Brassica tula, Cardaria draba, Capsella bursa-pastoris (females oviposit but larvae refuse it), Dentaria diphylla, Descurainia Sophia, Eruca sativa, Erysimum perenne, Lobularia maritime, Lunaria annua (retards larval growth), Matthiola incana, Nasturtium officinale, Raphanus sativus, Raphanus raphanistrum, Rorippa curvisiliqua, Rorippa islandica, Sisymbrium irio, Sisymbrium altissimum, Sisymbrium officinale (and var. leicocarpum), Streptanthus tortuosus, Thlaspi arvense (larvae grow slowly or refuse it); Capparidaceae: Cleome serrulata, Capparis sandwichiana; Tropaeolum: Tropaeolum majus; Resedaceae: Reseda odorata.
There is a three phase to host selection by the P. rapae adult female butterfly: searching, landing, and contact evaluation. A gravid female adult will first locate suitable habitats, and then identify patches of vegetation that contain potential host plants. The cabbage butterflies seem to limit their search to open areas and avoid cool, shaded woodlands even when host plants are available in these areas. Furthermore, gravid females will not oviposit during overcast or rainy weather. In laboratory conditions, high light intensity is required to promote oviposition. The females fly in a linear path independent of wind direction or position of the sun.
Host plant searching behavior
Pre-mating females do not display host plant searching behavior. The behavior starts soon after mating. Flight behavior of an ovipositing female of P. rapae follows the Markov process. Females foraging for nectar will readily abandon a linear path; they will show tight turns concentrating on flower patches. Females searching for host plant, however, will follow a linear route. As a result of directionality, the number of eggs laid per plant declines with increases in host plant density. The average move length declined as host plant density increases, but the decline is not enough to concentrate eggs on a dense host plant collard. Although females avoid laying eggs on plants or leaves with other eggs or larvae in a lab condition; this discrimination is not shown in field conditions.
Adult females may search for a suitable Brassicaceae over a range of 500 m to several kilometers.
Small differences in flight patterns have been observed in Canadian and Australian P. rapae, indicating that there may be slight variation between different geographic populations.
Landing appears to be mediated primarily by visual cues, of which color is the most important. P. rapae in a lab environment showed no significant preference for the shape or size of the oviposiiton substrate. Gravid females responded most positively to green and blue/green colors for oviposition. The preference was shown for surfaces with maximal reflectance of 550 nm. In natural conditions, oviposition was preferred on larger plants, but this was not reflected in laboratory conditions. Younger plants often had yellow/green color while older plants display a darker and stronger green. Female butterflies preferred the older plants due to the attraction to the darker green color. However, larvae perform better on younger plants.
Behavior on plant
Once a gravid female lands on a plant, tactile and contact chemical stimuli are major factors affecting acceptance or rejection of the site for egg deposition. Once a female lands on a host plant, it will go through a “drumming reaction” or a rapid movement of the forelegs across the surface of a leaf. This behavior is believed to provide physical and chemical information about the suitability of a plant. P. rapae is shown to prefer smooth hard surfaces similar to a surface of an index card over rougher softer textures like blotting paper or felt. P. rapae use their chemoreceptors on their tarsi to search for chemical cues from the host plant. An adult female will be sensitive to number of glucosinolates, gluconasturtiin being the most effective glucosinolate stimulants for these sensilla.
A gravid female adult will lay disproportionate number of eggs on peripheral or isolated plants. Singe larva is less likely to exhaust the whole plant, therefore laying eggs singly prevents the likelihood of larval starvation from resource exhaustion. This behavior may have evolved to exploit the original vegetation in the eastern Mediterranean where brassica plants originated.
Age of butterflies appears to have no effect on their ability to select the source of highest concentration of oviposition stimulant.
Additionally, it has been shown that the weather has a large impact on the eggs of P. rapae.  The main issues with the weather are that strong winds can blow eggs from the leaves and strong rains can drown the caterpillars.
Larvae feeding and growth is highly dependent on their body temperature. While the larvae survives from as low as 10 °C, the growth of larvae changes with changing temperature. From 10 °C to 35 °C, growth increases, but declines rapidly at temperatures higher than 35 °C. Past 40 °C, larvae start showing substantial mortality. The diurnal variation of temperature can be extensive with daily range of more than 20 °C on some sunny days and clear nights. Larvae are able to respond well to a wide range of temperature condition, which allows them to inhabit various locations in the world. In natural conditions, larvae shows fastest growth at temperatures close to 35 °C. however, in constant temperature conditions in laboratory, larvae shows mortality at 35 °C. In this lab condition, larvae grows between 10 °C to 30.5 °C while showing maximal developmental rate at 30.5 °C. The difference between lab and natural condition is due to routine temperature changes on the scale of minutes to hours under field conditions.
Studies in Britain showed that birds are a major predator in British town and city environments (such as in gardens) while arthropods had larger influence in rural areas. Bird predators include the house sparrow (Passer domesticus), goldfinch (Carduelis carduelis) and skylark (Alauda arvensis). Caterpillars are cryptic, coloured as green as the hostplant leaves and they rest on the undersides of the leaves, thus making them less visible to predators. Unlike the large white, they are not distasteful to predators like birds. Like many other "white" butterflies, they hibernate as a pupa. Bird predation is usually evident only in late-instar larvae or on overwintering pupae.
P. rapae caterpillars are commonly parasitized by a variety of insects. The four main parasitoids are Apanteles rubecula, Apanteles glomeratus, Phryxe vulgaris, and Epicampocera succinata. A. rubecula lays its eggs in the 1st and 2nd instar caterpillars. The larvae then grow within the caterpillar and continue to feed on the caterpillar until they are almost fully grown, and at that point the caterpillar is killed. It is important to note that only one larvae develops per host and the rate of A. rubecula is largely independent of P. rapae population size. A. glomeratus is similar to A. rubecula in that both parasitize the host in either the 1st or 2nd instar. The main difference is that A. glomeratus always kill the host in the 5th instar and multiple larvae can be raised within one host.
P. rapae pupae are frequently parasitized by Pteromalus puparum.
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Names and Taxonomy
Comments: Palaearctic species complex member.
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