Fungi Associated With Heterodera Glycines in Illinois
Carris, Lori Marie
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https://hdl.handle.net/2142/70607
Description
Title
Fungi Associated With Heterodera Glycines in Illinois
Author(s)
Carris, Lori Marie
Issue Date
1986
Department of Study
Plant Pathology
Discipline
Plant Pathology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Plant Pathology
Abstract
Populations of Heterodera glycines in two Illinois soybean fields were studied during 1983-1985. Soil samples were collected every 3-4 weeks from May-November of 1983 and from February-November of 1984-1985. Cysts of H. glycines were extracted from soil, counted, and fungi isolated. Identified fungi are described herein, illustrated, and keys presented for their identification.
Sixty-nine species of fungi were identified from cysts; 53 of these were Hyphomycetes, but species of Ascomycetes, Basidiomycetes, Coelomycetes and Zygomycetes were also identified. Populations of H. glycines and associated fungi were compared in the two fields. When both fields were planted with a H. glycines-susceptible soybean cultivar, one field had a significantly higher H. glycines population than the second field. The second field had an apparently suppressed H. glycines population which failed to rise during 1983-1985. Eighty percent of the cysts in the suppressed population and 64% of the cysts in the high nematode population were colonized by fungi. Fusarium solani, F. oxysporum, Stagonospora sp., Gliocladium roseum, Paraphoma radicina, Pyrenochaeta terrestris, Exophiala pisciphila and Diheterospora chlamydosporia were the predominant species colonizing cysts in both fields. Fusarium solani and Stagonospora sp. were the most common species in the field with the high nematode population, while F. oxysporum and P. radicina were most common in the suppressed population. The mycota associated with cysts in the suppressed population had a relatively more diverse species composition than the high nematode population. There was less fluctuation in both level of infestation and mycota species composition in the suppressed H. glycines population during 1983-1985.
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