Aleyrodes proletella

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Aleyrodes proletella on cabbage (click on image to enlarge it)
Source: Wikimedia Commons

Aleyrodes proletella (Linnaeus, 1758) - (European cabbage whitefly)

The species is widespread (mainly in temperate regions) on crucifers and other crops. The honeydew excreted by the insects, promotes the development of moulds.

Like for many other whitefly species, the eggs are laid in concentric circles on the lower side of the leaves. They hatch after a week and the nymphs develop through 4 instars. There are up to 5 or 6 generations per year under temperate conditions with one generation typically developing within 3-6 weeks.

Vernacular names
• Deutsch: Kohlmottenschildlaus
• English: European cabbage whitefly
• Español: mosca blanca del repollo
• Français: aleurode du chou

The adult is about 1½ mm long and covered with powder. Head and thorax are dark above, but yellowish underneath. The wings are white with 4 dark marks.