A Sequential Sampler for Monitoring Water-Disseminated Pathogens from Trees

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Abstract
An apparatus for studying the dissemination of water-borne pathogens from trees is described and illustrated. It is used for monitoring a population of rifampicin-resistant Pseudomonas syringa py. morsprunorum in rainwater collected under ''Montmorency'' sour cherry [Prunus cerasus] tree. The apparatus collects rain from a 5026-cm2 area and saves 5-8-ml subsamples for each 0.5 mm of rainfall. Simplicity of design and a sequential sampling mechanism operated solely by the weight of the collected rainwater make this apparatus useful for certain phytopathological studies.