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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (31): 118-122.doi: 10.11924/j.issn.1000-6850.casb2025-0276

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Spatial Distribution Pattern and Sampling Technique of Stephanitis chinensis Egg

CHEN Tingxu(), CHEN Shichun, JIANG Hongyan, LIAO Shuran, WANG Xiaoqing()   

  1. Tea Research Institute, Chongqing Academy of Agricultural Sciences, Chongqing 402160
  • Received:2025-04-10 Revised:2025-10-13 Online:2025-11-05 Published:2025-11-07

Abstract:

To clarify the spatial distribution pattern and sampling techniques of Stephanitis chinensis egg, this study analyzed the spatial distribution of S. chinensis egg in tea plantations using six aggregation indices, Taylor’s power law, and Iwao’s regression model. The aggregation causes and the optimal theoretical sampling number were further investigated. The results demonstrated that S. chinensis egg exhibited a density-dependent negative binomial aggregated distribution, where the basic component of the distribution was individual egg, and mutual repulsion was observed among individuals. The aggregation was jointly driven by the insect’s life history traits and environmental factors. When the control threshold was set at 6 eggs per leaf and the confidence level parameter was 1.96, the upper and lower limit equations were T 1 ( n ) = 6 n + 15 . 3478 n and T 0 ( n ) = 6 n - 15 . 3478 n, indicating that chemical intervention is required when the egg density exceeds 753 eggs per 100 leaves. By utilizing the spatial distribution parameters of S. chinensis egg, an Iwao’s theoretical sampling model was established to determine the optimal sampling number and sequential sampling table. This provides a methodological reference for accurate field density surveys and population prediction of S. chinensis eggs in tea plantations.

Key words: tea plant, Stephanitis chinensis, egg, spatial distribution, aggregation index, gathering, sampling technique