Studies on the epidemiology and yield losses from rice black-streaked dwarf disease in a recent epidemic in Zhejiang province, China

文献类型： 外文期刊

第一作者： Wang, H. -D.

作者： Wang, H. -D.;Jiang, X. -H.;Chen, J. -P.;Wang, A. -G.;Adams, M. J.

作者机构：

关键词： cultivar susceptibility;disease survey;Laodelphax striatellus;Rice black-streaked dwarf virus;sowing date

期刊名称：PLANT PATHOLOGY （ 影响因子：2.59； 五年影响因子：2.924 ）

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收录情况： SCI

摘要： The spread of rice black-streaked dwarf disease, which has emerged as a major problem on winter wheat and the two summer rice crops (early indica and late japonica) grown in central and southern Zhejiang province, China, is documented from 1995 to 2007. The late japonica crop suffered the most: up to 64 640 ha were affected with estimated losses of c. 120 000 t grain per year. Peak adult numbers of the small brown planthopper vector, Laodelphax striatellus, coincided with the seedling stages of both rice crops and the proportion of the insect population carrying virus increased during 1998-2005. Seedlings with three to four leaves were the most susceptible, whereas plants inoculated after the end of tillering developed few or no symptoms. Disease levels were strongly correlated with numbers of viruliferous vectors. In sowing-date experiments with both rice crops, the earliest sowings had the most disease and suffered the greatest yield losses. With the last sowing date (25 days after the first), there were almost no losses. There were yield losses of 0.80% for every 1% increase in disease incidence in early indica rice and rather more (0.92%) in the late japonica crop. There were large differences in susceptibility between cultivars, indicating the possibility, within currently available germplasm, of using more resistant cultivars to help contain the disease. Changes in cropping practice and in recent winter weather conditions have probably contributed to the emergence of the virus as a major pathogen in eastern China.

分类号： S432.1

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