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   Dendroctonus valens (insect)
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    Details of this species in Siskiyou County
    Status: Native
    Invasiveness: Invasive
    Occurrence: Established
    Source: Rappaport Owen & Stein 2001
    Arrival Date:
    Introduction:
    Species Notes for this Location:
    Management Notes for this Location:
    Location Notes:
    The area is a 17 year old, 2 266 hectare ponderosa pine plantation in Siskiyou County near Pondosa, CA (elevation 1 231 meters). This plantation was created at the site of the Pondosa fire of 1982, which was an extensive, stand-replacing fire. Soil had been compacted during salvage logging and was further compacted when the new plantation was mechanically thinned in 1998. After thinning, traffic lanes were sub-soiled in some parts of the plantation to rehabilitate the twice-compacted soils. Some pine roots were damaged in the subsoiling process. The combination of thinning and subsoiling was associated with D. valens attack. Tree mortality from D. valens attack became evident in 1999 and continued in 2000. In thinned plots an estimated 15% of standing trees had been killed by D. valens.
    Impacts:
    Ecosystem change: D. valens was recently found to be the cause of appreciable pine mortality in a thinned, subsoiled ponderosa pine plantation near Pondosa.
    Last Modified: 16/02/2009 3:34:24 p.m.


ISSG Landcare Research NBII IUCN University of Auckland