Characterization of soil organisms involved in the degeneration of ammophila-arenaria

摘要: The degeneration of Ammophila arenaria (marram grass) in stable stages coastal foredunes may be due to pathogenic or parasitic soil organisms. To test this, and characterize the organisms involved, biocides were applied sand collected from root zone natural stands A. arenaria. Seedlings grown biomass production was measured compared with growth seedlings γ-irradiated determine effects biocides. Sand mobile foredune sections (degenerated vigorous arenaria, respectively) examined. Improved seedling followed fungicide ncmaticide treatments m stable, as well foredunes. On other hand, bactericides (streptomycin penicillin) had no effect. propamocarb only stimulated very weakly, whereas benomyl increased significantly. However, effect not solely its fungiddal action, it also prevented infection by nematodes Heterodera (avenae group) Meloidogyne maritima. The highest increase yield obtained nematicide oxamyl, which root-infection endo-parasitic (Heterodera avenae group, M. maritima Pratylenchus sp.). Oxamyl reduced numbers ecto-parasitic nematodes. It is concluded that plant could important but interactions groups organisms, such fungi, cannot excluded.