Abstract
The use of cultivar mixtures is increasingly practical in wheat stripe rust management. Field experiments with wheat cultivar mixtures were conducted to determine their effects on temporal and spatial patterns of stripe rust epidemics in three regions. In the Beijing and Gangu fields, where the epidemics were caused by artificial inoculation, disease incidence and the area under the disease progress curve (AUDPC) of the cultivar mixtures were significantly lower (P < 0.05) than those of the susceptible pure stands. We defined the relative effectiveness of cultivar mixture on disease development related to that in pure stands (REM). The results demonstrated that in many treatments of mixtures of susceptible cultivar with resistant cultivars at various ratios in different locations, their effects on disease reduction were positive (REM < 1). The reduction of epidemic rate in cultivar mixtures expressed in either early season or late season depended on the initial pattern of disease and cultivar mixture treatments. Semivariograms were used to determine the spatiotemporal patterns of disease in the Gangu field. The spatial analysis showed clear spatial patterns of the disease in all four directions of the fields on susceptible pure stands but not on cultivar mixtures. The results implied that the mechanisms of cultivar mixture on disease management might include the interruption of disease spatial expansion and a physical barrier to pathogen inoculum by resistant cultivars.
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Acknowledgments
This study was supported by the Special Fund for Agro-Scientific Research in the Public Interests (200903035) and the National Natural Science Foundation of China (31071642). The authors gratefully thank Jie-bin Guo and Lei Zhao of China Agricultural University, and She-lin Jin, Man-ku Guo, Ming-an Jin, Shi-qin Cao, and Hui-sheng Luo, Institute of Plant Protection of Gansu province, for their assistance in the field experiments at Gangu. The authors also thank Yue-fu Liu and his colleagues, Yanting Plant Protection Station, for their help with the field trials at Yanting.
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Chong Huang and Zhenyu Sun contributed equally to this paper.
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Huang, C., Sun, Z., Wang, H. et al. Spatiotemporal effects of cultivar mixtures on wheat stripe rust epidemics. Eur J Plant Pathol 131, 483–496 (2011). https://doi.org/10.1007/s10658-011-9824-0
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DOI: https://doi.org/10.1007/s10658-011-9824-0