Spatiotemporal effects of cultivar mixtures on wheat stripe rust epidemics |
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Authors: | Chong?Huang Zhenyu?Sun Haiguang?Wang Email author" target="_blank">Yong?LuoEmail author Email author" target="_blank">Zhanhong?MaEmail author |
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Institution: | (1) Department of Plant Pathology, China Agricultural University, Beijing, 100193, People’s Republic of China;(2) Present address: Kearney Agricultural Center, University of California, Parlier, CA 93648, USA; |
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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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