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Effect of rice Sowing Date on Occurrence of Small Brown Planthopper and Epidemics of Planthopper-Transmitted rice stripe viral disease

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Agricultural Sciences in China 2009年第3期8卷 332-341页

作者： ZHU Jin-liang ZHU Zeng-rong ZHOU Yin LU Qiang SUN Xiang-liang TAO Xian-guo CHEN Yue WANG Hua-di CHENG Jia-an Jiaxing Plant Protection Station Bureau of Agricultural Economy of Jiaxing City Jiaxing 314050 P.R. China State Key Laboratory of rice Biology/Institute of Insect Sciences Zhejiang University Hangzhou 310029 P.R.China Jiaxing Academy of Agricultural Sciences Jiaxing 314016 P.R.China Food and Oil Station Xiuzhou District Jiaxing 314031 P.R. China Bureau of Plant Protection and Quarantine Department of Agriculture of Zhejiang Province Hangzhou 310020 P.R. China

To understand the relationship between rice sowing date and occurrence of the rice small brown planthopper （SBPH） Laodelphax striatellus Fallen and the epidemics of the planthopper-transmitted rice stripe viral （RSV） disease, four sowing dates of rice were evaluated in 2006 and 2007. The results showed that the peak density of SBPH and RSV incidence in the nursery and in the transplanted field decreased with the delay of sowing date in single crop of japonica rice in north Zhejiang Province of China. The relationship between seedling RSV incidence at the end of the nursery trial with sowing date was well described by Weibull equation. The area under the curve of population dynamics （AUCPD or planthopper-day accumulation） or the peak density of the planthopper in the nursery could be summarized by a logistic equation. RSV incidence in the transplanted fields could be characterized quantitatively by a multivariate regression equation, including the variables of sowing date, peak density of the vector, and RSV incidence at the end of the nursery trial. That the descriptive model excluded the AUCPD in transplanted field implies that this variable is not necessary in forecasting disease epidemics in the field. The 2-year experiments sufficiently indicated that suitable sowing of rice could be used as one of the effective measures to control the vector population and therefore the planthopper-transmitted RSV on a larger scale. The optimal sowing date for the single-cropped transplanted japonica rice is recommended from late May to early June in north Zhejiang, China.

关键词： rice sowing date Laodelphax striatellus rice stripe viral disease epidemics

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