No description available.

Master of Science / Department of Statistics / Leigh Murray / An experiment was performed in 2005-2006 to determine if the variety of an alfalfa (Medicago sativa) crop rotation can effectively reduce the pest complex consisting of the yellow and purple nutsedge (YNS & PNS) weeds and the southern root-knot nematode (SRKN). During the 2005-2006 growing season, six months were selected to take samples from the alfalfa field (three months in 2005 and three months in 2006). The field was divided into 1m x 2m quadrats. Each month eighty quadrats were randomly selected. The counts of PNS, YNS and a soil sample (analyzed for the count of juvenile SRKN) were taken from each quadrat. In this study, two different ways were examined use [i.e. using] spatial information provided from the experiment to alter the original model. First spatial information was treated as fixed effects. Second spatial information was treated as random effects by modifying the residual variance matrix using various “spatial” variance-covariance structures. The results were compared to the original Poisson model and the spatial models to each other but did not have an effective way of comparing random effects models with the fixed effects models. For this data, the use of spatial statistics did not improve the original model consistently. This may be partly because of the nature of the experiment. The alfalfa effectively reduced the YNS, PNS, and SRKN counts. The spatial information was generally more useful earlier in the experiment when the YNS, PNS, and SRKN populations were denser.

No description available.

"December 2002" / Corrections on back page. / Bibliography: leaves 118-129. / 129 leaves : ill. ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Annual ryegrass toxicity (ARGT) occurs in grazing animals following the ingestion of seedheads of the annual ryegrass Lolium rigidum, infested with the corynetoxin-producing bacteria, Rathayibacter toxicus. Breaking the disease cycle, through the use of lines of L. rigidum resistant to the nematode Anguina funesta can be used to reduce th risk of ARGT outbreaks. In L. rigidum, resistance to A. funesta appears to be under the control of two unknown, but complementary genes. This study explored alternate approaches towards the allocation of genotype for lines of L. rigidum with respect to resistance to A. funesta. / Thesis (Ph.D.)--University of Adelaide, Dept. of Applied and Molecular Ecology, 2003

Title from PDF of title page (University of Missouri--Columbia, viewed on Feb. 12, 2010 ). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dr. David A. Sleper, Thesis advisor Includes bibliographical references.

No description available.

Thesis (Ph. D.)--University of Adelaide, Dept. of Crop Protection, 1996? / Includes bibliographical references (leaves 224-236).

Thesis (Ph.D)--University of Adelaide, Depts. of Plant Science and Crop Protection, 1991. / Includes bibliographical references (leaves 265-296).

Thesis (Ph.D.) - James Cook University, 2005. / Typescript (photocopy) Bibliography: leaves 179-194.

Thesis (Ph. D.)--University of Wisconsin-Madison, 1962. / Typescript. eContent provider-neutral record in process. Description based on print version record. Bibliography: leaves 86-92.