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Browsing by Author "Garrett, Karen A."

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Connectivity of the American agricultural landscape: Assessing the national risk of crop pest and disease spread

Margosian, Margaret L.; Garrett, Karen A.; Hutchinson, J.M. Shawn; With, Kimberly A. (2009)

More than two-thirds of cropland in the United States is devoted to the production of just four crop species—maize, wheat, soybeans, and cotton— raising concerns that homogenization of the American agricultural landscape ...
Cultivar mixtures for the simultaneous management of multiple diseases: tan spot and leaf rust of wheat

Cox, C. M.; Bowden, R. L.; Fritz, A. K.; Dendy, S. P.; Heer, W. F.; Garrett, Karen A. (2004)

Because of differences in life histories between Puccinia triticina, a highly specialized, polycyclic, windborne pathogen with a shallow dispersal gradient, and Pyrenophora tritici-repentis, a residue-borne pathogen with ...
Do bacterial and fungal communities in soils of the Bolivian Altiplano change under shorter fallow periods?

Gomez-Montano, L.; Jumpponen, A.; Gonzales, M. A.; Cusicanqui, J.; Valdivia, C.; Motavalli, P.; Herman, M.; Garrett, Karen A. (2013)

This record provides supplemental material for this article: Gomez-Montano, L., A. Jumpponen, M. A. Gonzales, J. Cusicanqui, C. Valdivia, P. Motavalli, M. Herman, and K. A. Garrett. 2013. Do bacterial and fungal communities ...
Ecological genomics: making the leap from model systems in the lab to native populations in the field.

Travers, Steven E.; Smith, Melinda D.; Bai, Jianfa; Hulbert, Scot H.; Leach, Jan E.; Schnable, Patrick S.; Knapp, Alan K.; Milliken, George A.; Fay, Philip A.; Saleh, Amgad; Garrett, Karen A. (2007)

Recent reviews have emphasized the need to incorporate genomics into ecological field studies to further understand how species respond to changing environmental conditions. Genomic tools, such as cDNA (complementary DNA) ...
The effects of climate variability and the color of weather time series on agricultural diseases and pests, and on decisions for their management

Dobson, A. D. M.; Kroschel, J.; Natarajan, B.; Orlandini, S.; Tonnang, H. E. Z.; Valdivia, C.; Garrett, Karen A. (2013)

If climate change scenarios include higher variance in weather variables, this can have important effects on pest and disease risk beyond changes in mean weather conditions. We developed a theoretical model of yield loss ...
Effects of host diversity and other management components on epidemics of potato late blight in the humid highland tropics

Nelson, R. J.; Mundt, C. C.; Chacón, G.; Jaramillo, R. E.; Forbes, G. A.; Garrett, Karen A. (2001)

A field study at three highland sites near Quito, Ecuador, was conducted to determine whether host-diversity effects on potato late blight would be as important as recently found in studies conducted in temperate areas. ...
Effects of planting density and the composition of wheat cultivar mixtures on stripe rust: an analysis taking into account limits to the replication of controls

Mundt, C. C.; Garrett, Karen A. (2000)

The effect of plant density on disease is not well understood in populations of a single host plant genotype and has been studied even less in mixtures of host genotypes. We performed an experiment to evaluate the effect ...
Epidemiology in mixed host populations

Mundt, C. C.; Garrett, Karen A. (1999)

Although plant disease epidemiology has focused on populations in which all host plants have the same genotype, mixtures of host genotypes are more typical of natural populations and offer promising options for deployment ...
Experimental design for two-color microarrays applied in a pre-existing split-plot experiment.

Milliken, G.A.; Travers, S.E.; Garrett, Karen A. (2007)

Microarray applications for the study of gene expression are becoming accessible for researchers in more and more systems. Applications from field or laboratory experiments are often complicated by the need to superimpose ...
Host diversity can reduce potato late blight severity for focal and general patterns of primary inoculum

Mundt, C. C.; Garrett, Karen A. (2000)

The use of host diversity as a tool for management of potato late blight has not been viewed as promising in the past. But the increasing importance of late blight internationally has brought new consideration to all ...
Identifying highly connected counties compensates for resource limitations when evaluating national spread of an invasive pathogen

Sutrave, Sweta; Scoglio, Caterina; Isard, Scott A.; Hutchinson, J. M. Shawn; Garrett, Karen A. (2012)

Surveying invasive species can be highly resource intensive, yet near-real-time evaluations of invasion progress are important resources for management planning. In the case of the soybean rust invasion of the United States, ...
Management of potato late blight in the Peruvian highlands: evaluating the benefits of farmer field schools and farmer participatory research

Ortiz, O.; Heath, J. J.; Orrego, R.; Nelson, R. J.; Garrett, Karen A. (2004)

Farmer field school programs incorporating farmer participatory research (FPR-FFS) have the potential to provide important benefits to their participants and to other farmers who benefit from improved cultivars and management ...
Meta-analysis in plant pathology: synthesizing research results

Rosenberg, M. S.; Su, Z.; Bowden, R. L.; Garrett, Karen A. (2004)

Meta-analysis is a set of statistical procedures for synthesizing research results from a number of different studies. An estimate of a statistical effect, such as the difference in disease severity for plants with or ...
A metamodeling framework for extending the application domain of process-based ecological models

Sparks, A.H.; Forbes, G.A.; Hijmans, R.J.; Garrett, Karen A. (2011)

Process-based ecological models used to assess organisms’ responses to environmental conditions often need input data at a high temporal resolution, e.g., hourly or daily weather data. Such input data may not be available ...
New applications of statistical tools in plant pathology

Madden, L. V.; Hughes, G.; Pfender, W. F.; Garrett, Karen A. (2004)

The series of papers introduced by this one address a range of statistical applications in plant pathology, including survival analysis, nonparametric analysis of disease associations, multivariate analyses, neural networks, ...
Number of experiments needed to determine wheat disease phenotypes for four wheat diseases

Bockus, William W.; Su, Zhaohui; Garrett, Karen A.; Gill, Bikram S.; Stack, James P.; Fritz, Allan K.; Roozeboom, Kraig L.; Martin, T. Joe (2007)

Disease phenotypes for winter wheat cultivars were determined in numerous inoculated greenhouse and field experiments over many years. For four diseases, Fusarium head blight, tan spot, Septoria leaf blotch, and Stagonospora ...
Program to evaluate crop yield loss to biotic stressors and management decision rules in variable environments

Garrett, Karen A. (2012)

This R program evaluates simulations of yield loss to biotic stressors. The rate of yield loss is determined by an autoregressive process with flexible parameters, so that different levels of mean rate, variation in rate, ...
Pyrosequencing to determine the influence of fallow period on soil microbial communities in the Bolivian highlands

Gomez, Lorena; Jumpponen, Ari; Gonzales, Miguel A.; Cusicanqui, Jorge; Valdivia, Corinne; Motavalli, Peter; Herman, Michael; Garrett, Karen A. (2011)

In the Bolivian highlands (Altiplano; approx. 4000 masl), traditional fallow periods are being shortened in an effort to increase short-term crop yields, which may be at the expense of soil quality and plant health. ...
Reactions of perennial grain accessions to four major cereal pathogens of the Great Plains

Cox, C. M.; Cox, T. S.; Bockus, William W.; Peters, T.; Garrett, Karen A. (2005)

Methods of disease management used in annual grain crops, especially cultural practices designed to disrupt the disease cycle of a particular pathogen, will not necessarily be applicable to perennial grain crops. Resistance ...
Window of risk for emigration of Wheat streak mosaic virus varies with host eradication method

Jiang, W.; Peterson, D. E.; Harvey, T. L.; Bowden, R. L.; Fang, L.; Garrett, Karen A. (2005)

The wheat curl mite (WCM), Aceria tosichella, the vector of Wheat streak mosaic virus (WSMV), often survives the summer on volunteer wheat (Triticum aestivum) and may disperse from this “green bridge” in fall to newly ...

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