Reactions of eleven tetraploid and hexaploid wheat introductions to Hessian fly

The 11 wheat introductions were resistant to biotypes B, D, and L under greenhouse conditions. Nearly all seedlings of the durum lines Portugal 2536, Portugal 2852, Rebeiro, BD 3431 and IN 8464 (H5H5) were resistant at 19, 23, and 26 o C. Fewer seedlings of the durum lines BD 3414, BD 3885, and PI 422297; and of the common wheat lines PI 86202, PI 117499, PI134867, PI 321644, and «Abe» (H5H5) were resistant at temperatures>19 o C. Resistance conferred by the H5 gene was expressed in a grater percentage of seedlings of IN 8464 than Abe, especially at temperatures>19 o C. These results are of practical importance to wheat breeders in tropical or subtropical regions of the world where Hessian fly is a serious pest of wheat