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Influence of pine bark matric potential and ph on sporangium production by phytophthora cinnamomi



Influence of pine bark matric potential and ph on sporangium production by phytophthora cinnamomi



Phytopathology 74(11): 1359-1363



Sporangium production on mycelial mats of P. cinnamomi was compared in pine bark and in a Cecil clay soil at controlled matric potentials of 0 to -150 mb [milllibars]. Optimum sporangium production occurred between -15 and -25 mb in both substrates. Sporangium production was markedly less at -10 mb and at -150 mb in both pine bark and soil. Matric potential, not water content of the medium, regulated sporangium production. Maximum numbers of sporangia were produced 1 day after mats of mycelium were placed in the tensiometers at a constant matric potential of -25 mb. Incubation of mats for an additional 1-3 days did not increase sporangium production. Pine bark at pH 3.7 suppressed sporangium production. At pH 3.5, no sporangia were observed on mats incubated at a constant matric potential of -25 mb. Air-drying pine bark prior to saturation in Buchner funnel tensiometers completely suppressed sporangium production by P. cinnamomi. [Hardwood back composts suppress root rot of ornamentals caused by P. cinnamomin].

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Accession: 005689844

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