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Non-pathogenic  Bursaphelenchus mucronatus  and pathogenic  B. xylophilus  are transmitted to pine trees by cerambycid beetles of the genus  Monochamus . This study investigated the transmission of the two nematode species via vector’s oviposition wounds and their initial dispersal with relation to vector’s oviposition behavior and age for the  B. mucronatus − Monochamus saltuarius  and  B. xylophilus − M. alternatus  systems.  M. saltuarius  females were provided individually with a  Pinus densiflora  branch section. Immediately after the oviposition, branch sections were held at 25°C. The transmission of  B. mucronatus  was examined using the 15-mm-diam. bark disks containing an oviposition wound and their surrounding bark and xylem samples taken from branch sections 0 − 24 h after the oviposition.  B. mucronatus  was recovered only from the 15-mm-diam. bark disks. The proportion of oviposition wounds harboring  B. mucronatus  was 0.27 and the number of  B. mucronatus  transmitted into an oviposition wound averaged 2.1. When  M. alternatus  females were provided individually with a  P. densiflora  stem bolt, their oviposition behavior did not differ from  M. saltuarius  one. The inspection indicated that  B. xylophilus  was recovered from the 25-mm-diam. bark disks containing an oviposition wound and the surrounding bark and xylem samples taken from the bolts 0 − 24 h after the oviposition. The proportion of oviposition wounds harboring  B. xylophilus  was 0.31 and the number of  B. xylophilus  transmitted into an oviposition wound averaged 1.0. This study suggested that  B. mucronatus  left the vector’s oviposition wounds more slowly than  B. xylophilus .

journal of forest research

Transmission of  Bursaphelenchus mucronatus  Mamiya et Enda (Nematoda, Aphelenchoididae) from  Monochamus saltuarius  (Gebler) (Coleoptera, Cerambycidae) to pine branches via vector’s oviposition wounds in comparison to  B. xylophilus  (Steiner et Buhrer) Nickle carried by  M. alternatus  Hope