Pieris rapae
The small populations are highly threatened, one of the reasons being reduced populations of seabirds which they are dependent on to provide highly fertile and disturbed soils associated with nesting grounds. Additionally the species is susceptible to browsing by livestock, rodents, snails, and insect herbivores such as aphids, leaf miners, the diamondback moth ("Plutella xylostella"), and the small cabbage white butterfly ("Pieris rapae"). It is also affected by white rust, a fungus-like disease caused by the oomycete "Albugo candida".