Great Southern White (Ascia monuste) lives in coastal dunes, salt marsh and open scrub across North America, Central America, and South America.
Fascinating facts about the Great Southern White
- The great southern white is the only species in the butterfly genus Ascia, making the genus monotypic. Ascia belongs to the family Pieridae and is represented solely by Ascia monuste. This butterfly's range stretches from the Atlantic and Gulf coasts of the United States down through Central America to Argentina, giving it a broad Neotropical distribution.
- Great southern whites travel along the southeastern United States coast in a one-way migration that never reverses. Individuals have been recorded as far north as Maryland and as far inland as Kansas and Colorado during these movements. Within a single lifespan they may move up to 160 km along the coast to locate more suitable breeding sites, often departing from Florida.
- Newly emerged larvae immediately consume the chorion of their own egg, using it as their first meal, and they also eat whole conspecific eggs found on the same leaf. Researchers suggest this provides an extra source of protein at a critical early stage. Because the behaviour is opportunistic, it can raise individual fitness by supplementing the otherwise herbivorous diet.
- A female typically lays about 43 eggs, but can lay as many as 245 in a single clutch, depositing them singly or in clusters on Brassicaceae leaves. The butterfly locates suitable host plants by detecting glucosinolates, a characteristic chemical of the cabbage family. On kale leaves it prefers the apical, medium and basal regions for oviposition, ensuring the hatchlings have immediate access to food.
- Larval feeding can devastate crucifer crops, sometimes destroying the entire harvest, with up to 100% loss reported. The caterpillars, known locally as cabbage or kale caterpillars, remain on a single plant for the early instars and consume the leaves throughout their development. Their diet includes cultivated cabbage, radish and other Brassicaceae such as Cakile maritima.
Sources
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At a glance
RangeNorth America, Central America, and South America
HabitatCoastal dunes, salt marsh and open scrub
DietCassia and pea
About the Great Southern White
In the sun-drenched meadows of the southern Americas, the Great Southern White butterfly dances on delicate wings, its pale yellow and black scales glistening like polished onyx as it flutters from bloom to bloom. With an effortless elegance, it glides through the air, its slender body undulating as it rides the warm breeze, seeking out the sweet nectar that sustains it. As it alights upon a flower, its wings beat rapidly, a mesmerizing blur of motion that belies the gentle beauty of this unassuming, yet captivating, creature.
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