Thursday, August 7, 2008: 1:30 PM-5:00 PM
202 C, Midwest Airlines Center
OOS 22 - Plant Pathogen Ecology: The Effects of Plant Pathogens on Individuals, Populations, Communities, and Ecosystems
Plant pathogens are ubiquitous and recent research has provided us with dramatic examples of plant pathogens strongly influencing plant fitness, population dynamics, plant-herbivore interactions, community structure, invasion dynamics, and ecosystem function. However, we still know relatively little about the ubiquity and impact of plant pathogens in non-agricultural systems. The goal of this session is to bring together ecologists who work on a variety of plant pathogen systems at a variety of levels of biological organization. Recent research has shown that infection alters plant volatile emissions and induced plant defenses, thereby influencing both second and third trophic levels. Plant pathogens can drive invasions; for example, barley yellow dwarf virus has facilitated the invasion of California grasslands by exotic annual grasses. Endemic pathogens can help maintain high levels of biodiversity, while invasive pathogens like sudden oak death can completely transform native ecosystems. The speaker order will follow the order of biological scale, starting with individual-level processes and ending with ecosystem-level processes. Speakers will address a diverse range of plant pathogen systems including viruses, fungi, and bacteria in both temperate and tropical ecosystems.
Organizer:Caralyn B. Zehnder, Texas A&M University
Co-organizer:Micky D. Eubanks, Texas A&M University
Moderator:Micky D. Eubanks, Texas A&M University
1:30 PMVirus-induced changes in host chemistry: Do plant viruses manipulate insect vectors through a shared host?
Kerry Mauck, The Pennsylvania State University, Mark Mescher, The Pennsylvania State University, Consuelo De Moraes, The Pennsylvania State University
1:50 PMHost-mediated interactions between rhizosphere bacteria and insect herbivores in Arabidopsis
Don Cipollini, Wright State University, Jeanne Mbagwu, Wright State University
2:10 PMInfluence of aphid community composition and host plant preference on Cucumber mosaic virus infection rates in tomatoes
Caralyn B. Zehnder, Texas A&M University, Micky D. Eubanks, Texas A&M University
2:30 PMPathogen-mediated competition in experimental plant communities
Alison Power, Cornell University, Jennifer M Koslow, Cornell University, Charles E. Mitchell, University of North Carolina, Chapel Hill
2:50 PMNative grass-pathogen dynamics and non-native escape from disease: Andropogon virginicus and smut fungus
Janet A. Morrison, The College of New Jersey, Ermal Bojdani, The College of New Jersey, Brittany Graf, The College of New Jersey, Artur Romanchuk, The College of New Jersey
3:10 PMBreak
3:20 PMFertilization, tissue chemistry, and competition: Community context determines prevalence of barley yellow dwarf virus
Elizabeth T. Borer, Oregon State University, Eric W. Seabloom, Oregon State University, Charles E. Mitchell, University of North Carolina, Chapel Hill
3:40 PMThe fate of introduced plants: Accumulation of pathogens on scales of states and centuries
Charles E. Mitchell, University of North Carolina, Emily E. Pulley, University of North Carolina
4:00 PMPhyloepidemiology: Incorporating the phylogenetic structure of plant communities into plant disease ecology
Gregory S. Gilbert, University of California Santa Cruz, Rafael Aizprua, Smithsonian Tropical Research Institute, Campbell O. Webb, Arnold Arboretum of Harvard University
4:20 PMApparent competition among host species and feedbacks on disease severity in the sudden oak death pathosystem
Richard C. Cobb, University of Califorina Davis, Shannon C. Lynch, University of Califorina Davis, Margaret R. Metz, University of Califorina Davis, Ross Meentemeyer, University of North Carolina, Charlotte, David M. Rizzo, University of Califorina Davis
4:40 PMJanzen-Connell effects for all: The multiple negative effects of a specialist plant pathogen on host plant abundance
Zachariah J. Miller, University of Michigan

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See more of The 93rd ESA Annual Meeting (August 3 -- August 8, 2008)