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Effects of Nitrogenous Fertilization in Rice Fields on the Predatory Function ofCyrtorhinus Lividipennis to Nilaparvata lugens Stal

文献类型： 会议论文

第一作者： LU Zhongxian

作者： LU Zhongxian 1 ; YU Xiaoping 1 ; HEONG Kongluen 2 ; HU Cui 3 ;

作者机构： 1.Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, Zhejiang, China

2.International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines

3.Institute of Insect Science, Zhejiang University, Hangzhou 310029, Zhejiang, China

关键词： Cv'torhinus lividipennis;Nilaparvata lugens;rice;nitrogenous fertilization;predatory function

会议名称： The proceedings of the China Association for Science and Technology. Vol. 4, No. 1 /

主办单位：

页码： 571-577

摘要： The predatory capacities and functional responses of the mind bug, Cyrtorhinus lividipennis, on the brown planthopper (BPH), Nilaparvata lugens, on rice plants with different nitrogen contents and the effects of the rice sap and BPH honeydew on its predatory function were determined in the laboratory at International Rice Research Institute (IRRI), Philippines. The results showed that the predatory capacities of C lividipennis on BPH eggs and young nymphs were negatively related to the nitrogen content of host plants, while no significant difference in predatory capacities was recorded between C lividipennis populations successively fed on host plants applied with 0 kg N/ha and 200 kg N/ha nitrogen fertilizer for 2 generations. The functional responses of C lividipennis populations on BPH eggs belonged to typical Holling II, and the instantaneous rate of discovery (a) and handling times (Fit) were strongly affected by nitrogen contents in host plants The instantaneous rate of discovery reduced obviously resulted in the lower functional responses on the host plants applied with high nitrogen rate, however, the similar response shapes of different populations were found on the plants with the same nitrogen regime. Furthermore, the influences of rice sap from the plants and honeydew of the BPH females fed on the plants with high nitrogen regime on the extension of longevities of the adults of C lividipennis were higher than those on the plants with low nitrogen regime. However, the honeydew of BPH on the plants with high nitrogen regime significantly decreased the predatory capacity of C lividipennis on BPH eggs. These results implied that the reduction of C lividipennis natural control function should be one of the crucial factors to induce the outbreak of BPH population in rice fields applied with excessive nitrogenous fertilizer.

分类号： N5

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