Study on Dynamics of Rice Planthopper Population in Different Planting Environment Rice Fields

In order to analyze the populations of rice planthopper in different planting environment rice fields,we investigated diversity and single planting environment rice fields with sweep-net and light-trap method in Lubiao Town of Yunnan Province.The result showed that: Sogatella furcifera was the dominant rice planthopper in this local,they entered before rice transplanting.The fastigium was in the last ten days of June to the middle ten days of July,and S.furcifera move away after the middle of July.By the LSD test of S.furcifera nymph population in different planting environment rice fields,we found six times had significant difference(P0.05).Parasitism rate and sex ratio of S.furcifera in diversity planting environment rice fields was higher.The kinds and number of spider as natural enemies in diversity planting environment rice fields was also higher.Therefore,the diversity planting rice fields could have the better effects in rice planthopper control.