Instars of the Hessian Fly (Diptera: Cecidomyiidae)

Abstract
Larvae of the Hessian fly, Mayetiola destructor (Say), are shown to have three instars. The first instar feeds for approximately 6 d, during which much of the larval growth occurs. Considerable anatomical differences exist among instars. These differences are described and illustrated by drawings and SEM photographs.

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