Definition of Hessian fly in English:

Hessian fly

noun

  • A gall midge whose larvae are a pest of cereal crops, occurring in all wheat-growing areas.

    Mayetiola destructor, family Cecidomyiidae

    • ‘Resistance in wheat to the Hessian fly, a major insect pest of wheat, is based on a gene-for-gene interaction.’
    • ‘Plant breeders are constantly engaged in a vicious cycle, developing wheats that resist the Hessian fly… for a time.’
    • ‘The Hessian fly spread from Long Island in 1777, and a more widespread impact began to be felt in 1778.’
    • ‘Earlier seedings are more subject to root and crown rot and many other diseases and insects, for example wheat streak mosaic and Hessian fly.’
    • ‘It is resistant to stem rust, leaf rust and soilborne wheat mosaic virus, moderately resistant to wheat streak mosaic virus and susceptible to Hessian fly.’

Origin

Late 18th century so named because it was supposed (erroneously) to have been carried to America by Hessian troops during the War of Independence.