Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: April 1, 2004
Publication Date: April 1, 2004
Citation: Pratt, R.G. 2004. Comparative survival of conidia of eight species of dematiaceous hyphomycetes in soil [abstract]. Phytopathology. 94(Supplement):S87. Technical Abstract: Conidia of eight species of Bipolaris, Curvularia, and Exserohilum, produced on pieces of cellulose substrate (index card, filter paper), were incubated on substrates in nylon-mesh pouches in moist soil. At biweekly intervals up to 12 weeks, substrates were retrieved from soil and appressed to the surface of cornmeal agar. Conidia deposited on the agar were assayed for viability based on germination after 6-8 h. Significant differences in frequency of germination were attributed to species, incubation time, and species x time interactions. Species differences in survival of conidia were observed after 2 weeks and at all subsequent assay times. Mean survival of conidia was 0-68% for all species after 12 weeks. Conidia of C. lunata, B. sorokiniana, and B. stenospila usually survived longer or at higher frequencies in soil than did conidia of B. cynodontis, B. hawaiiensis, C. geniculata, and E. rostratum. B. spicifera gave variable results. C. lunata, B. sorokiniana, and B. stenospila may be preferred species for studies on survival of conidia in soil due to more prolonged and consistent survival of their conidia.