Cephus pygmeus

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Cephus pygmeus (click on image to enlarge it)
Author(s): Ken Walker, Museum Victoria
Source: PaDIL

Cephus pygmeus (Linnaeus) - (European wheat stem sawfly)

The species infests wheat and is native to Europe, northern Africa and western Asia. It has been introduced into North America, but is less destructive there, compared to the related Cephus cinctus. In contrast it is the dominant Cephus species on wheat in northern Africa and western Asia.

The biology of C. pygmeus and C. cinctus are similar. Eggs are laid into the developing stem of young wheat plants and the larvae develop there. When the plants are fully grown, the larvae move to the base of the stem and construct a chamber for overwintering. The stem of the attacked wheat plant usually breaks off above this chamber.