Influences of meteorological factors on rice planthopper occurrence in Hainan province

Based on the observation data of 18 meteorological stations，as well as the diseases and rice planthopper data and planted rice areas data in Hainan in 1961－2010，by the method of correlation analysis and the multiple regression，this paper analyzed the effects of meteorological factors changes on occurrence of rice planthopper. The results showed that the rice planthopper occurrence area had an average increase of 104 hm2 every 10 years in Hainan in recent 50 years. There were significant positive correlations between the rate anomaly of rice planthopper occurrence area and that of mean annual air temperature，high temperature days，precipitation， precipitation intensity and rainstorm days. The rate anomaly of rice planthopper occurrence area had significant negative correlations with that of annual sunshine hours，average speed of wind and relative humidity．Compared with other rice cropping regions in China，the temperature presented a weak correlation，while the precipitation presented a strong correlation with the ratio of rice planthopper occurrence area in Hainan. The risk zoning result in the research is basically consistent with the actual production in tropical regions.