Population Dynamics of Bursaphelenchus lignicolus (Nematoda : Aphelenchoididae) and B. mucronatus in Pine Seedlings

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Abstract
Two spp. of Bursaphelenchus nematode which were different in their pathogenicity to pine trees were inoculated onto the seedlings of Pinus thunbergii and P. densiflora, and dispersion and population density of both nematodes in the inoculated seedlings were examined once a week for 8 wk. Pathogenic B. lignicolus dispersed and reproduced rapidly in all inoculated seedlings of P. densiflora. Non-pathogenic B. mucronatus hardly reproduced in both pines except in a few seedlings though nematodes of this species could disperse as well as B. lignicolus. Rapid dispersion accompanied with reproduction of nematodes always resulted in weakening or death of hosts irrespective of the species of pine and nematode examined, though a few dead seedlings without so many nematodes were observed 6-8 wk after inoculation.