Occurrence and development of the Japanese giant weevil, Sipalinus gigas (Fabricius) (Coleoptera: Rhynchophoridae), in cut pine bolts set in a forest stand at different times.

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  • Nakamura Katsunori
    Kyushu Research Center, Forestry and Forest Products Research Institute
  • Makino Shun’ichi
    Kyushu Research Center, Forestry and Forest Products Research Institute Present address: Forestry and Forest Products Research Institute
  • Sato Shigeho
    Kyushu Research Center, Forestry and Forest Products Research Institute Present address: Shikoku Research Center, Forestry and Forest Products Research Institute

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The oviposition season and developmental time of Sipalinus gigas were investigated by periodic setting and collection of cut pine bolts at different times in a Pinus densiflora stand in central Kyushu. The number of S. gigas colonized in the bolts was estimated as the sum of the number of holes that were 3 mm or larger in dia. without scolytids and the ones less than 3 mm dia. with S. gigas larva. The oviposition season of S. gigas in the study stand was normally late April through mid-August with a peak in early summer. The eggs laid early in the oviposition season could grow to adults emerging in the autumn of the same year, although many overwintered as larvae and some of the survivors emerged as adults by November of the following year.

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