Biotypes J and L of the Hessian Fly Discovered in an Indiana Wheat Field1

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Abstract
Biotypes J and L of Mayetiola destructor (Say) were discovered in a field of ‘Arthur 71’ wheat in Randolph County, Indiana, in 1978. Neither biotype had been previously found in the wild; however, Biotype L had been selected in the laboratory. These 2 new biotypes can infest wheats having the H5 gene for resistance, heretofore resistant to all known Hessian fly biotypes. Biotypes B and D also were found but at a lesser frequency than biotypes J and L. With increased hectarage grown to wheats such as Arthur 71 having the H5 gene for resistance, the frequency of new biotypes that infest wheat with this source of resistance is expected to increase. Sixty-nine % of all larvae found on plants exhibiting a resistant reaction were alive even though the plants appeared healthy; therefore, plant stunting does not seem to be a prerequisite for larval survival.

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