Study on reactions of different wheat cultivars and improved lines to major foliar diseases in Golestan province

In order to study the reaction of 23 different advanced wheat cultivars and lines against major foliar diseases in Golestan province، including powdery mildew، brown rust and tan spot، an experiment was conducted in a randomized complete block design with three replications during winter of 2009. Infection was created naturally in the field by planting susceptible rows between the treatments. Evaluation of the treatments was done based on the intensity of different diseases (disease incidence، disease severity، area under disease progress curve (AUDPC) and standardized AUDPC، total seed weight and thousand kernel weight (TKW). Analysis of variance showed that treatments were statistically different (P≤0. 01) based on all recorded data. Results of multiple range test (LSD) showed that the highest and lowest severity of powdery mildew were observed in line 17 (72. 74%) and Gaspard (0%)، respectively. The highest and lowest severity of brown rust was observed in Bolani and Morocco (11. 11%) and Gaspard (0. 12%)، respectively. The highest and lowest severity of tan spot disease was recorded in Morvarid (94. 56%) and Morocco (0%)، respectively. The highest grain yields were recorded in line 11 (4340. 97g) and Morvarid (4013. 19g)، and lowest grain yields recorded in Bolani (184. 03g) and Morocco (250g). The highest and lowest TKW were observed in Cultivars Shiroudi (36. 33g) and Morocco (13. 53g)، respectively