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Movement of Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae) in tracheal system of adult Monochamus alternatus (Coleoptera: Cerambycidae)

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To clarify the movement of Bursaphelenchus xylophilus in the tracheal system of adult Monochamus alternatus, 49 adult beetles were dissected 0, 15, 30, 45 or 60 days after emergence and the nematodes heading inwards to the distal end and outwards to spiracles in tracheae were counted. In adult beetles just after emergence, the majority of nematodes headed inwards. The proportion of tracheae with nematodes heading outwards was significantly higher for beetles aged 15, 30 or 45 days than for newly-emerged beetles. The proportion of nematodes pointing outwards tended to increase with beetle age and was significantly greater in 45-day old beetles than in newly emerged ones. A comparison of prediction with observation suggests that the nematodes move forwards in the tracheal system from spiracles and exit from spiracles after turning round in the tracheae.

Le déplacement de Bursaphelenchus xylophilus (Nematoda: Aphelenchoididae) dans le système trachéen des adultes de Monochamus alternatus (Coleoptera: Cerambycidae) - Pour mieux comprendre le déplacement de Bursaphelenchus xylophilus dans le système trachéen de Monochamus alternatus 49 insectes ont été disséqués 0, 15, 30, 45 ou 60 jours après l'émergence et les nématodes se dirigeant dans les trachées vers l'intérieur - partie distale - et vers l'extérieur - stigmates - ont été comptés. Chez les insectes adultes, immédiatement après l'émergence la majorité des nématodes se dirigent vers l'intérieur. La proportion de trachées contenant des nématodes se dirigeant vers l'extérieur est significativement plus élevée chez les insectes âgés de 15, 30 ou 45 jours que chez ceux ayant émergé depuis peu. La proportion de nématodes se dirigeant vers l'avant a tendance à croître avec l'âge de l'insecte: elle est en effet significativement plus élevée chez les insectes âgés de 45 jours que chez ceux dont l'émergence est récente. La comparaison entre projection et observations suggère que les nématodes progressent dans le système trachéen à partir des stigmates et sortent par ces derniers après s'être retournés dans la trachée.

Affiliations: 1: Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 305-8687, Japan; 2: Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan

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/content/journals/10.1163/156854100509402
2000-08-15
2016-12-04

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