Abstract: Based on the data of meteorology and occurrences of rice planthoppers during 1975 to 2006 in fourteen counties of Fujian Province,the relation between occurrence level of rice planthoppers and meteorological conditions was analyzed.The results showed that the key meteorological factors which affected the occurrence and development of rice planthoppers in Fujian Province were the temperature and rain days in the second and third ten days of June and September respectively.The exponential index model for the meteorological grade index was established based on the key meteorological factors.The validation results by the historical test showed that the average correctness rate of forecast was 69.1% by comparing meteorological grade with actual grade.The meteorological grade of the occurrence fastigium of early rice planthoppers in the last ten days of June in 2007 in Fujian was forecasted with forecast correctness rate by 92.1%.The model could be put into the operational application.

Key words: Rice planthopper, Rice planthopper, Meteorological suitable grade forecast, Fujian Province