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adult beetle Adult Sawyer Beetles Austrian avoid bark beetles blue-stain fungi brown cedar cells cobalt-blue discoloration colonize contact the Plant dead pine dead trees Diagnostic Laboratory diseased tree due to pine dying pines Dying Tree eastern Kansas eggs enter exotic feeding wounds FIGURE 11 FIGURE 9 grubs healthy pine healthy tree impact inches infestation Iowa Japanese killed by pine landscape larvae living male nematode maturation feeding Microscopic Midwest Missouri Monochamus mugo mulch multiply Native pine Nebraska needle Nematodes are attracted Nematodes feed nematodes leave pine sawyer beetle pine species pine wilt disease pinewood nematode Plant Disease Clinic Plant Science posterior end pupae rapidly resin canals Resin flow sample sawyer beetle emerging Scots pine plantations spicule spread stress 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