Abstract:The population number of Haemadipsa hainana has been investigated every month in rubber plantation of Hainan Island for eight years.The effect of ten climatic factors on population numbers of H.hainana has been studied by stepwise regression analysis method.The result shows that:1)population dynamic of H.hainana is different every year.The effects of the major climatic facors on population dynamics are X 1 (rainfall) X 3 (rainday) X 5 (showday) for eight years.2)the rainy season in H...