EFFECTS OF AMENDING SOILLESS GROWING MIXTURES WITH SOIL CONTAINING ANTAGONISTIC ORGANISMS ON ROOT ROT AND BLACKLEG OF GERANIUM (PELARGONIUM HORTORUM) CAUSED BY PYTHIUM SPLENDENS

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Abstract
The addition of Trichoderma viride and a Streptomyces sp. to two commercial soilless mixtures infested with Pythium splendens delayed, by 22–28 days, the expression of severe disease symptoms in rooted geranium cuttings. An isolate of Penicillium funiculosum that also showed antagonism to P. splendens in culture had no significant effect on the disease. When steamed soil in which the three organisms were natural inhabitants was added to a P. splendens-infested mixture of peat–vermiculite–turface (4:4:1) the degree of protection obtained was directly proportional to the amount of soil added.

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