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Estimation of soybean rust uredospore terminal velocity, dry deposition, and the wet deposition associated with rainfall

文献类型： 外文期刊

作者： Li, Xun 1 ; Yang, XiaoBing 1 ; Mo, JanYou 2 ; Guo, TangXun 2 ;

作者机构： 1.Iowa State Univ, Dept Plant Pathol, Ames, IA 50011 USA

2.Guangxi Acad Agr Sci, Inst Plant Protect, Nanning 530007, Guangxi, Peoples R China

关键词： epidemiology;Phakopsora pachyrhizi

期刊名称：EUROPEAN JOURNAL OF PLANT PATHOLOGY （ 影响因子：1.907； 五年影响因子：2.022 ）

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收录情况： SCI

摘要： Using models from atmospheric chemistry and physics, this study examined the wet deposition of single uredospores of soybean rust caused by Phakopsora pachyrhizi associated with rainfall and its importance compared with dry deposition. First, a measurement of the terminal velocity of freshly collected P. pachyrhizi uredospores was conducted in Nanning, China. The observed terminal velocities associated with different sizes of the uredospore clumps were fitted by negative exponential models. The average terminal velocity of single uredospores (0.0187 m sp#) determined by the fitted models was used to estimate the dry deposition. The wet deposition of single uredospores associated with different rainfall rates was determined numerically using coupled models, in which raindrop capture efficiency of uredospores was based on Slinn's semi-empirical model. The results showed that at a rainfall rate of 0.5 mm hp#, wet deposition can remove 50% of the single uredospores in the air within 1 h. If the rainfall rate is 5 mm hp#, 10 min is sufficient to remove 50% of the uredospores. The dry deposition of the single uredospores was estimated with simplified scenarios: i.e., assuming the uredospore cloud was continuously from 1,000 to 2,000 m in height above a field with a uniform concentration. In the first 16 h, almost no uredospores reached the ground, while the wet deposition caused by 2 mm hp# rainfall within 30 min was even much greater than dry deposition of 24 h duration. The comparisons indicated that the wet deposition of soybean rust uredospores was much more efficient than the dry deposition.

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[1]Effects of light on urediniospore germination, appressorium formation and infection efficiency of Phakopsora pachyrhizi, causal agent of soybean rust. Yang, Xiaobing,Mo, Jianyou,Guo, Tangxun. 2010

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