Blue-stain fungi, Mariannaea elegans and Trichoderma spp. were frequently isolated from wilt-killed trees of Japanese red pine (Pinus densiflora). Propagation of pinewood nematodes (Bursaphelenchus xylophilus) on a blue-stain fungus (Ophiostoma minus) and Trichoderma spp. was examined. On O. minus, the nematodes propagated very well and the percentage of third-stage dispersal juveniles (JIII) was high. In contrast, the total population of the nematodes decreased and JIII did not appear on several kinds of Trichoderma spp. We inoculated Trichoderma spp. into the logs of pine wilt-killed P. densiflora to prevent blue-stain fungi from spreading over the logs and thereby tried to reduce the density of the nematodes to suppress the number of the nematodes carried by Monochamus alternatus.
Species 1: Nematoda Aphelenchoididae Bursaphelenchus xylophilus (pinewood nematode)
Species 2: Coleoptera Cerambycidae Monochamus alternatus (Japanese pine sawyer)
Keywords: bluestain fungi, Trichoderma spp
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