Population changes of the pinewood nematode, Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae), on fungi growing in pine-branch segments

Temporal changes in pinewood nematode (PWN) populations and the percentage of third-stage dispersal juveniles (J(III)s) of the PWN were examined on nine species of fungi growing in pine-branch segments. On Ophiostoma minus, Macrophoma sp., and Trichoderma sp. 1, the total PWN populations increased quickly for 4 weeks after nematode inoculation and then increased slightly or remained high. The number and percentage of J(III)s also increased with time, i.e., with increasing numbers of PWNs. In contrast, the total population of PWNs decreased and the number and percentage of JIIIs were small on Verticillium sp. and Trichoderma sp. 3.