Summary
Helleri holly were grown in 100% sand, 50% bark-50% sand, and 100% bark media and inoculated with Pythium irregulaye Buis. Pythium populations were determined at 4, 10 and 17 cm depths at planting date and every two weeks thereafter. After 7 weeks fresh weight of plants and populations of bacteria, actinomycetes, and total fungi were determined. P. irregulare was highest at the 4 and 10 cm depths, with bark media reaching their highest Pythium levels 4 weeks after inoculation. Pythium peaked in 100% sand 6 weeks after inoculation and declined thereafter.
Total bacteria increased with an increase in percent bark and were the predominant microbes. Actinomycetes comprised a greater proportion of the microbial population in sand and bark-sand media than in 100% pine bark. Total fungi were greatest in the 50% bark-50% sand medium. Fresh weight of Helleri holly increased with an increase in the percent bark in the medium.
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Portion of dissertation submitted in partial fulfillment of the requirements of Ph.D. in Plant Science.
Graduate Assistant, Associate Horticulturist, and Associate Plant Pathologist, respectively.
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Gugino, J.L., Pokorny, F.A. & Hendrix, F.F. Population dynamics of Pythium Irregulare Buis. In container-plant production as influenced by physical structure of media. Plant Soil 39, 591–602 (1973). https://doi.org/10.1007/BF00264176
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DOI: https://doi.org/10.1007/BF00264176