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Investigation of distributions and occurrences of three rice dwarf diseases in China in 2011-2012

Rao Lixia;Wang Zhencheng;Wu Jianxiang;Zhou Xueping;State Key Laboratory of Rice Biology,Institute of Biotechnology,College of Agriculture and Biotechnology,Zhejiang University;  
All Rice black-streaked dwarf virus(RBSDV),Southern rice black-streaked dwarf virus(SRBSDV)and Rice ragged stunt virus(RRSV)can cause rice dwarf disease.The occurrence and distribution of three rice dwarf diseases in Jiangsu,Zhejiang,Jiangxi,Guangxi,Hainan,Yunnan,Guizhou,Sichuan,Chongqing and Hunan provinces during 2011-2012 were investigated with dot-ELISA and RT-PCR detection methods.The results showed that infection rates of the three viruses(RBSDV,SRBSDV and RRSV)were 10.92%,30.67% and 4.62%for rice samples collected in 2011,and 0.40%,48.38% and 26.32% for rice samples collected in 2012, respectively,indicating that the occurrences of SRBSDV and RRSV in 2012 were severer than those in 2011, while the RBSDV disease in 2012 was lighter than that in 2011.RBSDV occurred mainly in Jiangsu and Zhejiang provinces,SRBSDV occurred mainly in Guangxi,Hainan,Yunnan,Guizhou,Chongqing and Zhejiang,while RRSV occurred mainly in Guangxi,Hainan,Yunnan,Guizhou and Chongqing,and often co-infected with SRBSDV.
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