* 资助项目：湖南省水稻产业技术体系专项资助（2010-2014）、湖南省研究生创新项目资助（CX2010B297）
** 通讯作者，Email:liyouzhi2008@sina.com
收稿日期：20110801，接受日期：20110901Transmission characteristics of Sogatella furcifera: A vector of the
Southern rice black streaked dwarf virus CAO Yang1PAN Feng2ZHOU Qian1 LI GuanHua1 LIU ShuangQing1
HUANG ZhiNong2LI YouZhi1**
(1Hunan Provincial Key Laboratory for Biology and Control of Plant Diseases and Insect Pests, College of
Biosafety Science & Technology, Hunan Agricultural University, Changsha410128, China;
2Plant Protection Station of Yongshun County, Yongshun410650, China;
3Institute of Hunan Provincial Plant Protection, Changsha410125, China）

AbstractSogatella furcifera (Horváth) is an important vector of the Southern rice blackstreaked dwarf virus (SRBSDV). Establishing the transmission characteristics of this species is therefore important to determining the periodicity of this disease and developing effective control methods for it. The presence or absence of SRBSDV in different lifestages of S. furcifera was determined using RTPCR. The results show that the viral acquisition periods of first instar nymphae, third instar nymphae, fifth instar nymphae, macropters and brachypters were 1119 min，612 min, 39 min, 28min and 28 min, respectively. At 26℃, the circulative period of SRBSDV in the body of these different lifestages was 711 d, 58 d, 37 d, 48 d and 36 d, respectively. The shortest periods required for the transmission of the virus to rice seedlings at the threeleaf stage by each of these developmental stages were 4 min, 5 min and 6 min, respectively, whereas the longest were 8 min, 10 min, and 11 min, respectively. The shortest period required for infection of rice seedlings at the early tillering stage by fifth instar nymphae and macropter and brachypter stages were 5 min, 7 min and 7 min, respectively, whereas the longest were 10 min, 12 min and 12 min, respectively. Once infected with the virus, individual S. furcifera can remain infectious for life. However, the virus is not passed on to the egg stage. The maximum number of rice plants infected with SRBSDV by a single S. furcifera was 87 and the average was 48.3±0.8. The results indicate that S. furcifera has a strong capacity for both the acquisition and transmission of SRBSDV, and that rice seedlings are highly susceptible to SRBSDV. The prevention and control of SRBSDV requires both effective control of S. furcifera in rice seedling beds and the weeding out of infected rice plants.
Key wordsSogatella furcifera， Southern rice blackstreaked dwarf virus, acquisition period, circulative period, inoculative periods