Canadian Forest Service Publications

Population dynamics of the pine wood nematode, Bursaphelenchus xylophilus, in excised branch segments of western North American conifers. 1996. Forge, T.A.; Sutherland, J.R. Fundamentals of Applied Nematology 19(4): 349-356.

Year: 1996

Available from: Pacific Forestry Centre

Catalog ID: 4688

Language: English

CFS Availability: Order paper copy (free)

Abstract

The population dynamics of two strains of the pine wood nematode, Bursaphelenchus xylophilus, were studied in excised branch segments of Pinus contorta, Abies grandis, Pseudotsuga menziesii, Tsuga heterophylla and Thuja plicata inoculated with the blue-stain fungus, Ophiostoma piceae. Nematodes were inoculated into small holes drilled into the center of the branch segments. Size and age-structure of the nematode populations were determined at regular intervals after inoculation. Nematode population growth occurred in branch segments of all tree species tested. However, population densities were significantly greater in P. contorta than in the other species. In one experiment, respective population densities in branch segments of P. contorta, A. grandis, P. menziesii, T. heterophylla and T. plicata increased from 2, 0.02, 0.1, 0.04 and 0.05 nematodes/g dry wood at 2 weeks after inoculation to 57, 15, 11, 13 and 6 nematodes/g dry wood after 16 weeks. The relative abundance of persistent third-stage juveniles (J3P) increased through time in all tree species and was greatest in P. contorta at most sample dates. The relative abundance of J3P was significantly greater in P. contorta than in the other species in one of two experiments only.

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