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16

Climatic analysis to define the overwintering region of soybean rust in China

Presenter: Z. H. Ma

All authors and affiliations: Z. D. Zhang (1), Z. H. MA (1), Y. X. Wang (3), J. Chen (4), and X. B. Yang (2). (1) Department of Plant Pathology, China Agricultural University; (2) Department of Plant Pathology, Iowa State University; (3) Institute of Plant Protection, Yunnan Academy of Agricultural Science; and (4) Station of Plant Protection, Jingdong County, Yunnan

Soybean rust (Phakopsora pachyrhizi Sydow) has been found in 23 provinces in China and is frequently a destructive disease in southern China. To delineate the overwintering areas of soybean rust, data sets from 743 climatic stations in China during 19512001 were analyzed using a geographical information system (GIS). The result of our analysis produced a climatic map of the overwintering area of soybean rust in China that should be useful in managing the disease. Analogical distance was calculated using average temperature and average rainfall during 10-day periods and maximum and minimum monthly temperature between Qionghai and the other 742 climatic stations during 12-2nd month. The GIS software Arcmap completed the map, using Kriging methods for interpolation between stations. The result showed that soybean rust can overwinter in nearly all of Hainan island, in southern portions of Guangdong Province, and in local areas of southern Guangxi and Yunnan Provinces. As yet, these modeling results need to be confirmed by observations of overwintering of soybean rust in these areas. (This research was supported in part by the USDA,ARS,REE. (Agreement Number: 58-1920-3-031F) and the article has published in Chinese Journal of Oil Crop Sciences.)

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