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1:15 p.m. O-2. Cross comparison of soybean gene
expression upon infection by pathogens and
the symbiont Bradyrhizobium japonicum. O. E.
RADWAN (2), O. Zernova (2), V. V. Lozovaya
(2), S. J. Clough (1). (1) Dept. of Crop Sciences,
USDA-ARS Soybean/Maize Germplasm,
Pathology and Genetics Research Unit, University
of IL, Urbana, IL, U.S.A., (2) Dept. of Crop
Sciences, University of Illinois, Urbana, IL,
U.S.A.
1:30 p.m. O-3. Identification of NLS signals and a
DNA binding domain in the host specificity
determinants HsvG and HsvB of the gall-forming
Pantoea agglomerans. D. M. WEINTHAL (3),
S. Manulis-Sasson (1), G. Nissan (3), T. Tzfira
(2), G. Sessa (3), S. Barash (3). (1) A.R.O.
The Volcani Center for Agricultural Research,
(2) Developmental Biology, The University of
Michigan, Ann Arbor, MI, U.S.A., (3) Tel-Aviv
University, Tel-Aviv, Israel
1:45 p.m. O-4. hrpW is a critical virulence factor of
Xanthomonas citri ssp. citri. J. F. FIGUEIREDO
(2), J. B. Jones (2), J. H. Graham (3), F. F. White
(1). (1) Kansas State University, Manhattan, KS
U.S.A., (2) University of Florida, Gainesville, FL
U.S.A., (3) University of Florida, Lake Alfred, FL
U.S.A.
2:00 p.m. O-5. Molecular characterization of virulence
and pathogenicity determinants in Xanthomonas
axonopodis pv. manihotis. L. F. CASTIBLANCO
(3), C. A. Trujillo (3), N. C. Alfonso (3),
C. Lopez (2), B. Szurek (1), V. Verdier (1),
S. Restrepo (3), A. J. Bernal (3). (1) IRD,
Montpellier, France, (2) Universidad Nacional,
Bogota, Colombia, (3) Universidad de Los Andes,
Bogota, Colombia
2:15 p.m. O-6. The non-ribosomal peptide synthetase
TxtB from plant-pathogenic Streptomyces uses
4-nitrotryptophan as a substrate for thaxtomin
biosynthesis. E. G. JOHNSON (1), S. B.
Krasnoff (5), D. R. Bignell (3), W. Chung (4),
R. J. Parry (2), R. Loria (3), D. M. Gibson
(5). (1) Citrus Research and Education Center,
University of Florida, Lake Alfred, FL, U.S.A.,
(2) Department of Chemistry, Rice University,
Houston, TX, U.S.A., (3) Department of Plant
Pathology, Cornell University, Ithaca, NY, U.S.A.,
(4) Seed Improvement & Propagation Station,
Hsinshe Taichung, Taiwan, R.O.C, (5) USDA
Agricultural Research Service, U.S. Plant, Soil,
and Nutrition Laboratory, Ithaca, NY, U.S.A.
2:30 p.m. O-7. Characterization of bruI, an expI-like
autoinducer synthase gene, in Brenneria
rubrifaciens, the causal agent of deep bark
canker on walnut. A. E. MCCLEAN (1), B. A.
Duerkop (2), E. Greenberg (2), D. A. Kluepfel
(1). (1) USDA, ARS, Crops Pathology Genetics
Research Unit, Davis, CA, U.S.A., (2) University
of Washington, Department of Microbiology,
Seattle, WA, U.S.A.
2:45 p.m. O-8. Survey of plant non-homologous end
joining (NHEJ) pathway components for role
in Agrobacterium T-DNA integration. Z. E.
VAGHCHHIPAWALA (1), K. Mysore (1). (1)
The Samuel Roberts Noble Foundation
Diseases of Plants – Ornamental
1:00 – 3:00 p.m. * 208 AB
Section: Diseases of Plants
1:00 p.m. O-9. Fraser fir, a new host of Phytophthora
capsici. L. M. QUESADA OCAMPO (1), D. W.
Fulbright (1), M. K. Hausbeck (1). (1) Michigan
State University, East Lansing, MI, U.S.A.
1:15 p.m. O-10. Development of a rapid method to screen
hosta cultivars for resistance to hosta petiole rot
caused by Sclerotium rolfsii var. delphinii based
on application of oxalic acid. Z. XU (1), M. L.
Gleason (1), D. Mueller (1). (1) Department of
Plant Pathology, Iowa State University, Ames, IA,
U.S.A.
1:30 p.m. O-11. Population dynamics and dispersal
gradient of Aphelenchoides fragariae in ornamental
nurseries. L. M. KOHL (1), C. Y. Warfield
(2), M. Benson (1). (1) North Carolina State
University, (2) University of California-ANR
1:45 p.m. O-12. Effect of fungus gnat Bradysia impatiens
(Diptera: Sciaridae) feeding on subsequent
Pythium aphanidermatum infection of geranium
seedlings (Pelargonium × hortorum). S. E.
ARNOLD (1), E. B. Nelson (2), J. P. Sanderson
(1), M. L. Daughtrey (2), S. P. Wraight (3). (1)
Cornell University, Department of Entomology,
Ithaca, NY, U.S.A., (2) Cornell University,
Department of Plant Pathology, Ithaca, NY,
U.S.A., (3) USDA-ARS, Robert W. Holley Center
for Agriculture & Health, Ithaca, NY, U.S.A.
2:00 p.m. O-13. Characterization of Abutilon yellow mosaic
virus, a tobamovirus occurring in flowering
maple (Abutilon × hybrida). C. V. ALMEYDA-
BECERRA (1), B. E. Lockhart (1). (1) University
of Minnesota, U.S.A.
2:15 p.m. O-14. Incidence and diversity caulimoviruses in
wild dahlia species from the Mexican highlands
and the cultivated dahlias in the U.S. S. EID (2),
K. Druffel (2), D. Saar, (1), H. Pappu (2). (1)
Murray State University, Murray, KY, U.S.A.,
(2) Washington State University, Pullman, WA,
U.S.A.
2:30 p.m. O-15. Thiophanate methyl-resistant
Colletotrichum cereale isolates exhibiting amino
acid substitutions in the beta-tubulin 2 gene. J.
R. YOUNG (1), M. T. Peterson (1), F. P. Wong
(2), K. de la Cerda (2). (1) Mississippi State
University, Mississippi State, MS, U.S.A., (2)
University of California, Riverside, Riverside, CA,
U.S.A.
2:45 p.m. O-16. Resistance screening of Festuca arundinacea
to both Rhizoctonia solani and Rhizoctonia zeae
using digital image analysis. V. R. SYKES (2), B.
J. Horvath (2), S. E. Warnke (1). (1) USDA, (2)
Virginia Tech
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