Wu Yan, Zhang Guo, Chen Xiao, Li Xi-Jie, Xiong Kai, Cao Shu-Pei, Hu Yan-Yue, Lu Ming-Hong, Liu Wan-Cai, Tuan Hoang-Anh, Qi Guo-Jun, Zhai Bao-Ping
Department of Entomology, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China (
National Agricultural Techniques Extension and Service Center, the Ministry of Agriculture, Beijing 100125, China (
J Econ Entomol. 2017 Jun 1;110(3):854-864. doi: 10.1093/jee/tox062.
Southern rice black-streaked dwarf virus (SRBSDV) caused serious rice losses. After the first outbreak in 2009 in northern Vietnam and southern China, the virus ravaged crops again on enormous scales in 2010, but infections have decreased sharply since 2011. We presumed that the sudden epidemics and fadeout of SRBSDV would be closely related to the migratory events of the insect vector, Sogatella furcifera. This study sought the source area of SRBSDV using the trajectory analysis method, and revealed the relationship between SRBSDV dynamics and migration of S. furcifera populations via an in-depth analysis of meteorological background of S. furcifera migration fields. The results showed that Northern Vietnam was the direct virus source area of the SRBSDV infection in China, and South Central Coast of Vietnam was the original source area of SRBSDV. Southwesterly winds were prevalent in spring of 2010 and carried large numbers of viruliferous S. furcifera to China from northern Vietnam. This infestation of S. furcifera was the direct cause of the SRBSDV outbreak in China in 2010. In 2011, the winter-spring temperatures were abnormally low and southeasterly and easterly winds dominated; therefore, the number of viruliferous S. furcifera that entered China was small, and consequently, the occurrence area of SRBSDV was rapidly reduced. The return of viruliferous S. furcifera to South Central Coast of Vietnam was an important factor that affected the occurrence scale of SRBSDV in the following year.
南方水稻黑条矮缩病毒（SRBSDV）给水稻造成了严重损失。自2009年在越南北部和中国南方首次爆发后，该病毒在2010年再次大规模肆虐作物，但自2011年以来感染率急剧下降。我们推测，SRBSDV的突然流行和消退与昆虫介体白背飞虱的迁飞活动密切相关。本研究采用轨迹分析方法寻找SRBSDV的来源地，并通过深入分析白背飞虱迁飞区域的气象背景，揭示了SRBSDV动态与白背飞虱种群迁飞之间的关系。结果表明，越南北部是中国SRBSDV感染的直接病毒来源地，越南中南部海岸是SRBSDV的原始来源地。2010年春季盛行西南风，携带大量带毒白背飞虱从越南北部进入中国。白背飞虱的这种侵染是2010年中国SRBSDV爆发的直接原因。2011年，冬春气温异常偏低，东南风和东风占主导；因此，进入中国的带毒白背飞虱数量较少，SRBSDV的发生面积迅速减少。带毒白背飞虱返回越南中南部海岸是影响次年SRBSDV发生规模的一个重要因素。
