The aim of this research was to study whether mycorrhizal fungi colonizing the roots of ericaceous plants may be regarded as a biocontrol agent against the Phytophthora cinnamomi pathogen. The pathogen,s inoculum was mixed with the substrate 2 weeks after the planting rhododendron and blueberry plants. Five mycorrhizal inocula were prepared using the fungi isolated from roots of ericoid plants grown in natural habitat conditions. The observations on the growth and development of the rhododendron and blueberry plants were conducted 4, 8 and 12 weeks after the application of mycorrhizal inocula to the roots of tested plants. The research showed that both untreated and P. cinnamomi treated substrate, some of the tested inoculants stimulated the growth and number of leaves of tested plants, and reduced the degree of plant infection with the pathogen. The obtained results revealed the utility of used inocula to stimulate the development of ericaceous plants and reduce their infection with P. cinnamomi.
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