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Mayetiola Kieffer, 1896
This genus contains around 30 species of gall midges and is wide-spread. They infest mainly cereals and grasses. The females lay eggs on the leaves and the hatching larvae move into the leaf sheaths and stems where they manipulate the host tissue and cause stunting, reduced tillering and stem breaking.
A survey of cereal fields in Morocco (1992) showed that about 2/3rd of the fields had significant infestations with Mayetiola species with more than 20% of the tillers damaged. Economically the most important species is the Hessian fly which infests wheat.
Currently, the following species have been entered into the system: