Hybrid Necrosis and Disease Resistance in Winter Wheats

One hundred and forty four semiwinter and winter varieties of brend wheat (Tritieum aestivum L.) were screened for their reaction to powdery mildew at the seedling stage and to stem, leaf and stripe rusts) at maturity, under natural and artificial epiphytotic conditions at Wellington in the Nilgiris. The stocks were also investigated for the hybrid necrosis genes. The winter wheats were found to be either Ne2-carriers or noncarriers; only one variety, Opal, was found to be Net-carrier.