Flight Dynamics and Abundance ofIps sexdentatus(Coleoptera: Curculionidae: Scolytinae) in Different Sawmills from Northern Spain: Differences between LocalPinus radiata(Pinales: Pinaceae) and Southern France IncomingP. pinasterTimber

摘要

In January 2009, the windstorm “Klaus” struck the southern part of France, affecting 37.9 million m3of maritime pinePinus pinasterAiton (Pinales: Pinaceae). This breeding plant material favored the outbreak ofIps sexdentatus(Börner) (Coleoptera: Curculionidae: Scolytinae). As much of this timber is imported to the Basque Country (northern Spain), a potential risk to conifer stands is generated, due to the emergence of the incoming beetles. Thus, flight dynamics and beetle abundance were compared in different sawmills, according to the timber species (either localP. radiataD. Don or importedP. pinaster). A maximum flight peak ofI. sexdentatuswas observed in mid-June inP. pinasterimporting sawmills, whereas a second lighter peak occurred in September. In contrast, only a maximum peak in mid-June was observed inP. radiatainhabiting beetles, being significantly smaller than in localP. pinastertrading sawmills. In addition, significant differences were found between importedP. pinasterandP. radiataregarding the number of insects beneath the bark. The development of IPM strategies for controllingI. sexdentatuspopulations is recommended, due to the insect abundance found inP. pinasterimported timber.