Effectiveness of selected genes for Hessian fly resistance in wheat.

Abstract

Wheat (Triticum spp.) containing: known sources of Hessian ny, M(Jyetio{a destructor (Say), rcsiSUlllCC was cvnluatcd ng:ninst mixed-biotype field populalions of the insect. in Georgia. Sources containing HI-J-l](j genes, except fol' 1-14, find Marquillo l'csistllncc were evaluat.ed. Typically. the effectiveness of rcsisl.nncc sources wns consistent with I.he predicted virulence of lhe Hessian fly biotype mixture reported to occur in Georgia. or the resisl~lnce sources currently deployed in the ricld, the H7H8 was the most effective. H3 was ineffective, but several sources of H3 were found to contclin additional ~enes for resistnnce. Sources containing HI H2. 1-19, H9J-110 and H 13 genes and some sources of Marquillo resistance were effective. Teml>ernture sensitive genes, HllJ, HlI, f-112 and Marquillo. were only partially effective in the field. These results demonstrate lhe imparlance of field evnlllations in conjunclion with laboratory evaluations to assess the effectiveness of sources of Hessian ny resistance for use in wheal. breeding programs.