Abstract:

【Objective】 Dynamic process and spatial pattern of the white-backed planthopper (WBPH), Sogatella furcifera (Horváth) nymphs after they immigrated into the rice were studied to provide a theoretical basis for its integrated control. 【Method】Models of space variation were constructed at the directions of east-west and south-north based on the geostatistical method by using 10 survey data from the transplanting to ripening of the rice in Xiushan, Chongqing in 2008. Isoclines maps of the WBPH nymphs at each stage were created by the geostatistical software Surfer8.0 with Kriging interpolation. 【Result】 The variograms showed the higher the WBPH nymphs density was, the larger the space variation scope became. Average space variation was 38.7% caused by the random factor and 61.3% caused by the autocorrelation. The random degree of space variation became greater as the rice grew up. Space-related area was 18.99 m in the direction of east-west and 25.09 m in south-north averagely. Kriging interpolation indicated that aggregated scope in south-north was larger than in east-west. 【Conclusion】 The population of white-backed planthopper nymphs showed a clumped distribution mainly after immigrating into rice fields and south- north was the main direction for WBPH nymphs to aggregate and diffuse.

Key words: white-backed planthopper, geostatistics, spatial distribution, Surfer 8.0