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Studies on the Natural Population Dynamlcs of Rice Planthoppers and Their Cbemical Control Tech-niques.

Yang Limei Chen Zhongcheng Bao Huali Zhong Quohong (Institute of Plant Protection,Guangdong Academy of Agricultural Sciences,Guangzhou 51064).  
A simulated test for immigrated rice planthoppers and a serial investigations showed that themultiplication rate of brown planthopper Nilaparvata lugens Stal did not bear relationship to the immigrantnumber,but closely related to the growing stage of rice plants.The maximum numbers of brown planthop-per occurred in rice booting to late heading.For white-backed planthopper,Sogatella furcifera(Horvath)the maximum numbers occurred in late tillering stage,and the dynamics of its natural population and com-position showed insignificantly related to the growing stage of rice plant.The nymphal stage was impor-tant in damaging the rice plants.The results of chemical control test showed that compound pesticide Shi-wenling was more effective than isoprocarb and methamidophos in controling rice planthoppers.The appli-cation at early booting stage was proved to be better than that at early heading stage in single applicationplots,but a second application at the early heading stage was suitable in two-application plots.
【CateGory Index】: S435.112.3
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