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Zeng F.-Y.,Chinese Academy of Forestry | Wang T.,Mentougou Forestry Station | Zong S.-X.,Beijing Forestry University
Forest Research | Year: 2012

The damage characteristics and spatial distribution of Sphenoptera sp. larvae population on Artemisia ordosica were analyzed by using biostatistics and geostatistical methods in order to effectively control the insect and to further study the damage characteristics and spatial distribution of the population. The results showed that the larvae of Sphenoptera sp. distributed on the whole plant, but showed a trend of increasing first and then decreasing from top to bottom. However, about 95% of the larvae were concentrated in the roots 8 cm underground. Four theoretical models (spherical, exponential, Gaussian, and linear) were used to represent the observed spatial correlation of larvae and it was found that the spherical isotropic model fitted the best with 3.12 m spatial dependence and 0.98 intensity of local spatial continuity. These indicated that the spatial distribution of larvae followed an aggregation distribution, and the aggregation points were primarily distributed in different areas of the woodland and then spread to the entire woodland.

Sheng M.-L.,General Station of Forest Pest Management | Sun S.-P.,General Station of Forest Pest Management | Wang T.,Mentougou Forestry Station
Zootaxa | Year: 2013

Seven species of Xenoschesis Förster, 1869, are reported from China. Four species, X. (Polycinetis) inareolata Sheng & Sun, sp. n. from Liaoning Province, X. (Polycinetis) truncata Sheng & Sun, sp. n. from Liaoning, Jilin and Henan Provinces, X. (Xenoschesis) tianzhuensis Sheng & Sun, sp. n. and X. (Xenoschesis) weii Sheng & Sun, sp. n. collected in Anhui Province are new to science. One, X. (Xenoschesis) fulvipes (Gravenhorst) was reared from Acantholyda parki Shinohara & Byun and A. posticalis Matsumura, is new record for China. Xenoschesis (Xenoschesis) crassicornis Uchida was reared from A. erythrocephala (L.) and A. parki Shinohara & Byun. A key to species of Xenoschesis Förster known in China is provided. Copyright © 2013 Magnolia Press.

Pan J.,Beijing Forestry University | Wang T.,Mentougou Forestry Station | Wen J.,Beijing Forestry University | Luo Y.,Beijing Forestry University | Zong S.,Beijing Forestry University
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2011

Dendroctonus valens LeConte (Scolytidae), was first detected in Shanxi Province, northern China, in 1998 and started causing widespread tree mortality in 1999. This outbreak continues and has spread to three adjacent provinces, causing unprecedented tree mortality. In North America, it is considered to be a secondary pest, and is often associated with more aggressive bark beetle species. The bionomics and occurrence, response to host volatiles and host preferences of this pine beetle in China are different from what is known of the beetle in its native range in North America. Changes in D. valens invasion characteristics after introduction into China, were evaluated from damage to Pinus tabulaeformi forests at the Lingkonshan Forest Farm in Shanxi Province, and the Xiaolongmen Forest Farm in Beijing, from July to August in 2009. Health stages of P. tabulaeformis were considered to be one cell of the spatial resources of D. valens population based on niche theory, and they were divided into healthy wood, mild weak wood, moderate weak wood, dying wood, and withering wood. In addition, historical data on D. valens was examined to establish its invasion characteristics in China. Based on niche theory, the niche breadth of D. valens was narrow, it barely affected moderate weak wood, dying wood and withering wood, while it primarily invaded both healthy and mild weak wood, and was a primary pest. Through searching historical data on D. valens at the Huanglongshan Forest Farm in Shanxi Province, Lingkonshan Forest Farm in Shanxi Province, Xingjiayu Forest Farm in Hebei Province, and the Xiaolongmen Forest Farm in Beijing, D. valens originally invaded weak and injured wood, but now it mainly invades both healthy and mild weak wood, and is a primary pest. This helps to explain the population expansion and colonization mechanism of D. valens, and to provide a good reference point for adopting suitable control measures.

Zhanga H.,Beijing Forestry University | Zong S.,Beijing Forestry University | Luo Y.,Beijing Forestry University | Wang T.,Mentougou Forestry Station | And 2 more authors.
Zeitschrift fur Naturforschung - Section C Journal of Biosciences | Year: 2013

Volatiles emitted by healthy Artemisia ordosica (Asteraceae) and plants infested with larvae of Sphenoptera sp. (Coleoptera: Buprestidae) or Holcocerus artemisiae (Lepidoptera: Cossidae) were obtained using a dynamic headspace method and analysed by automatic thermal desorption/gas chromatography/mass spectrometry (ATD/GC/MS). Twenty-eight major compounds were identifi ed, and qualitative and quantitative differences were compared. The novel green leaf volatiles 2-hexenal, (Z)-3-hexen-1-ol, 2-hexen- 1-ol 1-hexanol, and (Z)-3-hexen-1-ol acetate, the terpenoids α-copaene, β-cedrene, and (E,E)-α-farnesene, and the ester methyl salicylate were present in all infested plants. Volatiles from healthy plants were dominated by D-limonene (32.14%), β-pinene (16.63%), β-phellandrene (16.06%), and sabinene (12.88%). Volatiles from Sphenoptera sp. larvaeinfested plants were dominated by D-limonene (24.74%), β-pinene (21.05%), α-pinene (19.39%), and sabinene (11.64%), whereas volatiles from H. artemisiae larvae-infested plants were dominated by D-limonene (31.76%), sabinene (18.49%), ocimene (15.93%), and β-phellandrene (10.59%). In addition to the qualitative variation, a larvae-induced quantitative change in the proportion of terpenoids in the blends was also a noticeable feature. © 2013 Verlag der Zeitschrift für Naturforschung.

Ge X.,Beijing Forestry University | He S.,Beijing Forestry University | Wang T.,Mentougou Forestry Station | Yan W.,Chinese Academy of Sciences | Zong S.,Beijing Forestry University
PLoS ONE | Year: 2015

As the primary pest of palm trees, Rhynchophorus ferrugineus (Olivier) (Coleoptera: Curculionidae) has caused serious harm to palms since it first invaded China. The present study used CLIMEX 1.1 to predict the potential distribution of R. ferrugineus in China according to both current climate data (1981-2010) and future climate warming estimates based on simulated climate data for the 2020s (2011-2040) provided by the Tyndall Center for Climate Change Research (TYN SC 2.0). Additionally, the Ecoclimatic Index (EI) values calculated for different climatic conditions (current and future, as simulated by the B2 scenario) were compared. Areas with a suitable climate for R. ferrugineus distribution were located primarily in central China according to the current climate data, with the northern boundary of the distribution reaching to 40.1°N and including Tibet, north Sichuan, central Shaanxi, south Shanxi, and east Hebei. There was little difference in the potential distribution predicted by the four emission scenarios according to future climate warming estimates. The primary prediction under future climate warming models was that, compared with the current climate model, the number of highly favorable habitats would increase significantly and expand into northern China, whereas the number of both favorable and marginally favorable habitats would decrease. Contrast analysis of EI values suggested that climate change and the density of site distribution were the main effectors of the changes in EI values. These results will help to improve control measures, prevent the spread of this pest, and revise the targeted quarantine areas. © 2015 Ge et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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