Full TGIF Record # 224370
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Author(s):Kaminski, J. E.; Dernoeden, P. H.; O'Neill, N. R.
Author Affiliation:Department of Natural Resource Sciences & Landscape Architecture, University of Maryland
Title:Environmental influences on ascospore release of Ophiosphaerella agrostis under controlled and field conditions
Source:Turfgrass Pathology & Weed Science Yearbook of Research Winter 2004. Winter 2004, p. 45.
# of Pages:1
Publishing Information:College Park, Maryland: University of Maryland Department of Natural Resource Sciences and Landscape Architecture
Abstract/Contents:"Ophiosphaerella agrostis, the causal agent of dead spot of creeping bentgrass (Agrostis stolonifera), produces prodigious numbers of pseudothecia and ascospores throughout the summer. The objectives of this research were to: 1) determine the infulence of changes in light and relative humidity on ascospore release; 2) document the seasonal and daily discharge patterns of ascospores; and 3) elucidate environmental conditions that promote ascospore release. In a growth chamber study, a sharp decrease in relative humidity resulted in a rapid discharge of ascospores, regardless of light. In field studies, ascospores were collected between May and October 2001-2002. Major ascospore release events generally occurred during the early morning and evening hours or during precipitation events. Few ascospores were released when the bentgrass canopy was dry. Ascospore discharge occurred in a cyclic pattern that peaked about every 12 days. New infection centers appeared approximately 3 to 10 days after a large release of ascospores."
Note:Reprint appears in Phytopathology, 95(6) June Supplement 2005, p. S170
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kaminski, J. E., P. H. Dernoeden, and N. R. O'Neill. 2004. Environmental influences on ascospore release of Ophiosphaerella agrostis under controlled and field conditions. Turfgrass Pathol. Weed Sci. Res. Sum. p. 45.
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