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Scientia Silvae Sinicae ›› 2013, Vol. 49 ›› Issue (10): 100-105.doi: 10.11707/j.1001-7488.20131016

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Spatial Distribution of Trabala vishnou gigantina Eggs with GS+

Zhang Yiqiao1, Liu Yonghua1, Zong Shixiang1, Lu Pengfei1, Qi Lianzhen2, Luo Youqing1   

  1. 1. Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University Beijing 100083;
    2. Wuqi County Forestry Station, Shaanxi Province Wuqi 717600
  • Received:2013-01-08 Revised:2013-03-20 Online:2013-10-25 Published:2013-11-05

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Abstract:

In recent years, Trabala vishnou gigantina (Lepidoptera: Lasiocampidae) had caused enormous economic losses in the northwest drought region of China, where Hippophae rhamnoides forests were distributed. As one of the most important defoliators in that area, larvae of T. vishnou gigantina feeding on tender leaves primarily caused damage to the crown layers of the trees. Using Software GS+ and geostatistics methods, we investigated the spatial distribution of eggs of T. vishnou gigantina in pure H. rhamnoides forest. Results showed that adult moths preferred to spawn on the female pupae, with an incidence of 63.2%. Eggs gathered mainly at heights of 66.5 cm on the tree stems. Average distance between eggs and nearby female pupae was 22.9 cm. Analysis of isotropic variograms indicated that the distance of spatial dependence of eggs was 95.782 m, while the intensity of local spatial continuity was 0.680. Furthermore, semivariogram analysis revealed that the Gaussian model was fitted best to eggs distribution, implying an aggregation distribution. The maps derived from the Kriging interpolation exhibited that the spatial distribution of T. vishnou gigantina eggs was similar to that of the female pupae. Taking climatic factors into consideration, we found that oviposition of T. vishnou gigantina was affected by the temperature and rainfall from late-August to mid-September. This research provided a theoretical basis for controlling T. vishnou gigantina, particularly in predicting their potential distribution areas and future possible population density.

Key words: Trabala vishnou gigantina, eggs, spatial distribution pattern, geostatistics, climatic factors

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