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Ecology and Epidemiology
DensityDependent Parasitism of Xiphinema diversicaudatum by Pasteuria penetrans in a Naturally Infested Field. A. Ciancio, Istituto di Nematologia Agraria C. N. R., Via Amendola 165/A, 70126, Bari, Italy; Phytopathology 85:144149. Accepted for publication 23 September 1994. Copyright 1995 The American Phytopathological Society. DOI: 10.1094/Phyto85144.
Parasitism of Xiphinema diversicaudatum by the nematode pathogen Pasteuria penetrans was studied in a naturally infested peach grove in Italy. The nematode density and the numbers of specimens infected or encumbered with spores were determined at monthly intervals during 2 yr in six replicated plots. Nematode densities varied between 32.4 ± 13.8 and 121.7 ± 26.5 specimens per 100 cm^{3} of soil. The percentages of nematodes parasitized by P. penetrans were low, varying between 0.7 ± 0.7 and 9.3 ± 1.6. Both parameters remained relatively constant in time, fluctuating at 2 to 3mo delays with maximum 2.6 and 9.8fold increases, respectively. Similar trends were observed for the percentage of nematodes with spores and the mean number of spores per nematode. Densitydependent trends for nematode abundance and rates of parasitism by P. penetrans were shown by Bulmer’s and Pollard’s tests. When the grove was sampled to determine the spatial distribution of X. diversicaudatum densities and parasitism, X. diversicaudatum were found in 87.5% of the samples. Parasitism by P. penetrans was observed in 80.3% of the samples containing X. diversicaudatum. A subset of 43 (76.8%) observations from the spatial sampling was described by the equation 0.026 ln(y) – 0.0038y = 0.000043x – 0.0052 ln(x) + 0.04, where x is the number of nematodes per 100 cm^{3} of soil and y is the percentage of parasitism by P. penetrans.
Additional keywords: biological control, LotkaVolterra equation, modeling, population dynamics.
