Field Crop Production 44th Croatian & 4th International Symposium on Agriculture 606 The Fertilizing Influence on Pyrenophora tritici repentis attack in Agricultural Research and Development Station Simnic area

Abstract

Abstract Tan spot caused by Pyrenophora tritici repentis has gained predominance among foliar wheat diseases in the most of the wheat growing areas in the world. In the last years tan spot has become also an important wheat disease in ARDS Şimnic area. The present paper is focus on the fertilizing influence on Pyrenophora tritici repentis attack on a set of 25 winter wheat cultivars evaluated for their response to natural infection under field conditions. The pathogen attack degree was calculated in three times in vegetation T1 (Z44), T2 (Z51) and T3 (Z59). There was higher attack degree on unfertilized plots, while the attack degree was lower on fertilized plots (N100P40). The high attack degree show the cultivars sensitivity to pathogen attack, as Autan, while the low attack degree show a good cultivars behavior to pathogen attack, as Renesansa, Serina and Martina, which realized also good yields. These data suggest that nitrogen fertilizers appear to reduce disease by delaying natural leaf senescence but don`t have a direct effect on Pyrenophora tritici repentis