Abstract
To survey endophytic actinomycetes as potential biocontrol agents against fungal diseases of mountain laurel, young plants of mountain laurel (Kalmia latifolia L.) were used as an isolation source. From a total of 73 actinomycetes isolates obtained from leaves, stems and roots of test plants, Streptomyces sp. AOK-30 was selected, because i) it had a broad and intense antimicrobial spectrum against various yeasts and fungal pathogens of Ericaceae, ii) it grew on the multiplication and rooting media for tissue culture for this plant, and iii) the tissue-cultured seedlings that had been treated with this isolate became resistant to Pestalotia disease without any adverse growth effects such as malformation, dwarfing, discolorization and defoliation. This isolate was identified as Streptomyces sp., based on cultural, physiological and morphological characteristics. The present results indicate that isolate AOK-30 is a potential biocontrol agent against diseases of mountain laurel.
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