Type of Document Master's Thesis Author Reed, Karen L. URN etd-07242012-040058 Title The influence of meteorological events and cultural practices on sclerotinia crown and stem rot of alfalfa, caused by Sclerotinia trifoliorum.by Karen L. Reed. Degree Master of Science Department Plant Pathology, Physiology, and Weed Science Advisory Committee
Advisor Name Title Stromberg, Erik L. Committee Chair Phipps, Patrick M. Committee Member VanScoyoc, S. W. Committee Member Keywords
Date of Defense 1987-01-05 Availability restricted AbstractSclerotinia crown and stem rot (SCSR), caused by Sclerotinia
trifoliorum Eriks., causes serious spring losses in some fall=sown,
no-tillage alfalfa fields. In microplots artificially
infested with sclerotia, greatest numbers of apothecia were found
during November and December. Temperature and rainfall had significant
impact on apothecium development. A proposed prediction
method for apothecium appearance considers monitoring mean soil
temperature. For apothecium initiation to occur, it was necessary
for sclerotia to be subjected to an estimated 17 days of
temperature at or below 15 C before apothecium production
occurred. Soil temperatures were usually below 10 C at the time
of apothecium appearance. Greatest numbers of apothecia occurred
between 5-10 C. Rainfall influenced the number of apothecia,
with significant increases occurring early in the 1984-85 production period.
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