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[Spatial structure and pattern of Nilaparvata lugens population in large-scale]
1Institute of Entomology & State Key Laboratory for Biocontrol, Zhongshan University, Guangzhou 510275.
Ying Yong Sheng Tai Xue Bao = the Journal of Applied Ecology
|January 5, 2002
Summary
Brown planthopper (BPH) populations exhibit a clumped spatial distribution in rice fields. BPH density is higher in western Guangdong, with varying spatial structures across generations.
Area of Science:
- Agricultural Entomology
- Spatial Statistics
- Pest Management
Background:
- The brown planthopper (BPH), Nilaparvata lugens, is a significant pest impacting rice cultivation.
- Understanding BPH spatial distribution is crucial for effective pest management strategies.
Purpose of the Study:
- To analyze the spatial distribution patterns of different brown planthopper generations in Guangdong Province.
- To investigate the spatial structures and density variations of BPH populations.
Main Methods:
- Variogram analysis was employed to study the spatial distribution of BPH.
- Ordinary Kriging interpolation was used to create simulation distribution maps.
- The influence of sampling size on spatial structure was assessed.
Main Results:
- BPH populations displayed a clumped distribution pattern during the first rice season.
- Distinct spatial structures were observed for three BPH generations, with clump ranges of 400 km, 200 km, and 205 km.
- Higher BPH population densities were found in western Guangdong compared to eastern regions.
- Sampling size did not significantly affect the observed spatial structure of BPH.
Conclusions:
- The spatial distribution of BPH in Guangdong Province is clumped and varies by generation.
- Geographical variations in BPH density highlight the need for spatially targeted control measures.
- Variogram analysis and Ordinary Kriging are effective tools for mapping and understanding pest distribution.
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