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   Dendroctonus valens (insect)
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    Details of this species in Shanxi
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Established and expanding
    Source: Yan et al. 2005
    Arrival Date:
    Introduction:
    Species Notes for this Location:
    Dendroctonus valens was probably introduced into China in the early 1980s when unprocessed logs were imported from the west coast of the USA (report on file at Chinese Academy of Sciences, Beijing, in Yan et al. 2005). Since 1999 D. valens has spread rapidly from Shanxi province to the adjacent provinces of Hebei, Henan, and Shaanxi and infested over 500 000 hectares of pine forest, causing extensive tree mortality. Pines are a major reforestation tree in China and P. tabuliformis is widely planted across a large portion of the country making the potential range of D. valens is nationwide (Britton and Sun 2002, in Yan et al. 2005).
    D. valens is widely distributed in Shanxi province, and parts of the adjacent provinces of Hebei, Henan, and Shaanxi. The most heavily attacked forests are located in the Taihang, Lulang, and Zhongtiao Mountains in Shanxi province, from 600 to 2000 meters elevation (Zhang et al. 2002, in Yan et al. 2005). To date, the red turpentine beetle has been found in 62 counties, eight forestry Bureaus and two afforested mine stands.
    Management Notes for this Location:
    The Chinese State Forestry Administration currently ranks the red turpentine bark beetle as the second most important national forest pest (Yan et al. 2005). A National Management Project was initiated for D. valens in 2000. In 2001, eastern Shaanxi became infested. About 30% of the 85 300 hectares of pine forest in the province have been infested. About 7% of P. tabuliformis died in 2001. In 2002 D. valens infestations extended into Henan province but quick action by the State Forestry Administration appears to have kept damage to a minimum. Restrictions on unauthorized tree harvesting and the movement of infested material (logs, wood blocks, and wood boxes with bark) have been strictly enforced (Yan et al. 2005).
    Location Notes:
    Impacts:
    Economic/Livelihoods: There are valuable pine forests in the mountains of China less than 3000 meters in elevation. The potential range of D. valens is much wider than its current distribution putting these forestry investments at risk of infestation (Song et al. 2000, in Yan et al. 2005).
    Ecosystem change: "Pine trees in northern China, including P. tabuliformis (at highest risk of D. valens infestation) have been widely planted in high elevation areas for several decades. The pines are used in reforestation because of their cold-resistant and drought-resistant properties. P. tabuliformis and other pine species play significant roles in water and soil conservation in the fragile ecosystem of barren Chinese mountainous areas. The decline of pine forests caused by D. valens, if left unchecked and unmitigated, will increase soil erosion, alter habitats and have adverse impacts on native fauna and flora.

    ECOSYSTEM PROCESSES:  Important forest ecosystem processes may be affected. As forest ecosystems change, the use of the forest for resources, recreation and by wildlife may be affected. "
    Interaction with other invasive species: Forests in China infested with D. valens are also in danger of attack by the beetle Hylastes parallelus Chapuis (Wu et al. 2002). The interaction between these two beetles, as well as the role of H. parallelus in D. valens infestations, are unknown.
    Reduction in native biodiversity: More than 10 million Pinus tabuliformis pine have reportedly been killed in China by D. valens. Other pine species, including Pinus bungeana have also been affected (Li et al. 2001, Miao et al. 2001, Zhang et al. 2002, in Yan et al. 2005).

    Last Modified: 16/02/2009 3:34:24 p.m.


ISSG Landcare Research NBII IUCN University of Auckland