Abstract: Fifty-four spring wheat varieties( lines) cultivated in northeastern regine were identified during 2005-2006 for resistances to stem rust , powdery mildew and Helminthosporium leaf blight at seeding and adult stages, respectively.The results showed that there were 3 varieties resistant to powdery mildew, at six percent of all varieties; 46 var-ieties were resistant to stem rust, at eighty-five percent of all variet ies; 11 variet ies were moderate resistant toHelminthosporium leaf blight, at twenty percent against the others. The most varieties were resistant to stem rust , but therewas st ill threat of resistance degressiveness; almost all the variet ies identified lacked resistance to powdery mildew;Helminthosporium leaf blight was a common seen disease in the field and the disease severity degree went higher year byyear. So we identified those varieties and hoped to offer parts of practical guidance for wheat breeding. Methods mentionedhereinbefore were discussed in this paper.

Key words: Wheat variet ies, Powdery mildew, Stem rust, Helminthosporium leaf blight(HLB), Resistance ident ification

CLC Number: 

• S435.121