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adult beetle Adult Sawyer Beetles attracted Austrian avoid bark beetles beetle emerging blue-stain fungi brown cedar cells cobalt-blue discoloration colonize contact the Plant dead pine dead trees develop Diagnostic Laboratory diseased tree due to pine dying pines Dying Tree eastern Kansas eggs enter exotic feeding wounds FIGURE 9 healthy pine healthy tree Illinois impact inches infestation Iowa killed by pine landscape larvae living male nematode maturation feeding Microscopic Midwest Missouri Monochamus mugo mulch multiply Native pine Nebraska needle Nematodes feed nematodes leave nouns pine sawyer beetle pine species pine wilt disease pinewood nematode Plant Disease Clinic Plant Science posterior end pupae rapidly resin canals Resin flow sample Scots pine plantations spicule spread stain fungi stress summer susceptible pines susceptible species Symptoms threat tip blight trachea breathing tube Transmitted nematodes trunk tunnel twig University white pine wilt disease cycle wilt has appeared wilt-killed windbreaks wood chips wood nematode