A field survey was conducted in Genesee, Idaho in 2001 and 2002, to determine Hessian fly parasitoid species present in a no-till system. Hessian fly puparia were collected throughout the growing season from stubble of the fly susceptible spring wheat variety Penawawa planted in 2000 and 2001. Parasitoids were reared from the puparia in the laboratory and identified to species. The most abundant parasitoid species were Homoporus destructor and Pediobius epigonus. The incidence and abundance of Hessian fly parasitoids under no-till and conventional tillage systems were evaluated also. Hessian fly puparia were collected from Penawawa plants in September and October and parasitoids dissected from the puparia. Percentage of Hessian fly infested with parasitoids was determined. Our studies verify the importance of Hessian fly parasitoids in Hessian fly population regulation.
Species 1: Diptera Cecidomyiidae Mayetiola destructor (Hessian fly)
Species 2: Hymenoptera Pteromalidae Homoporus destructor
Species 3: Hymenoptera Eulophidae Pediobius epigonus
Keywords: tillage systems, wheat
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