Title page for ETD etd-07242012-040058

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

Alfalfa

Date of Defense

1987-01-05

Availability

restricted

Abstract

Sclerotinia 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.

Files

Filename		Size	Approximate Download Time (Hours:Minutes:Seconds)
Filename		Size	28.8 Modem	56K Modem	ISDN (64 Kb)	ISDN (128 Kb)	Higher-speed Access
	LD5655.V855_1987.R44.pdf	4.51 Mb	00:20:53	00:10:44	00:09:24	00:04:42	00:00:24

next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.