Annual Meeting Program Book - American Phytopathological Society

Turf, Ornamental, & Fruit Diseases
8:30 – 11:30 a.m.; C123
Section: Diseases of Plants
Moderators: Dilip Kumar Lakshman, USDA ARS, Beltsville,
MD, U.S.A.; Christie Almeyda, Washington State University,
Pullman, WA, U.S.A.
8:30 a.m. O-238. Development of a chitinase assay for tall
fescue challenged with Rhizoctonia solani. M. A.
CUTULLE (1), B. Horvath (1), D. McCall (1),
J. Derr (2). (1) Virginia Tech, Ellicott City, MD,
U.S.A.; (2) Virginia Tech, Virginia Beach, VA,
U.S.A.
8:45 a.m. O-239. A new Rhizoctonia sp. pathogenic to seashore
paspalum turfgrass. S. KAMMERER (1),
P. F. Harmon (2). (1) University of Florida, Saint
Augustine, FL, U.S.A.; (2) University of Florida,
Gainesville, FL, U.S.A.
9:00 a.m. O-240. Analysis of ribosomal DNA-ITS region
for grouping of Rhizoctonia species isolated
from turfgrass in Maryland and Virginia. B.
S. AMARADASA (1), B. Horvath (1), D. K.
Lakshman (2), S. E. Warnke (2). (1) Virginia
Tech., Blacksburg, VA, U.S.A.; (2) USDA-ARS
FNPRU, Beltsville, MD, U.S.A.
9:15 a.m. O-241. Multilocus sequence analysis of Sclerotinia
homoeocarpa populations from turfgrasses.
T. A. TAYLOR (1), I. Carbone (1), L. P. Tredway
(1). (1) North Carolina State University,
Raleigh, NC, U.S.A.
9:30 a.m. O-242. Effects of soil temperature on Sclerotinia
homoeocarpa growth, survival, and pathogenicity.
C. WILSON (1), J. Kerns (1). (1) University of
Wisconsin-Madison, Madison, WI, U.S.A.
9:45 a.m. O-243. Genetic diversity of endogenous plant
pararetorival sequences associated with dahlia
mosaic from geographically diverse sources of
dahlia. C. V. ALMEYDA (1), K. L. Druffel (1),
M. Samuitiene (2), H. R. Pappu (1). (1) Washington
State University, Pullman, WA, U.S.A.;
(2) Vilnius University, Vilnius, Lithuania
10:00 a.m. BREAK
10:15 a.m. O-244. Para-retroviral sequences in wild Dahlia
spp. in natural habitats from the Mexican mountain
ranges. S. EID (1), K. Druffel (1), D. Saar
(2), H. Pappu (1). (1) Washington State University,
Pullman, WA, U.S.A.; (2) Department
of Biological Sciences, Murray State University,
Murray, KY, U.S.A.
10:30 a.m. O-245. Molecular variability of Grapevine fanleaf
virus in Washington State vineyards. L. R.
GUTHA (1), T. A. Mekuria (1), R. R. Martin
(2), N. A. Rayapati (1). (1) Washington State
University, Prosser, WA, U.S.A.; (2) USDA-
ARS Horticulture Crops Research Laboratory,
Corvallis, OR, U.S.A.
11:00 a.m. O-246. Prevalence and severity of Tomato ringspot
nepovirus in a commercial apple orchard in
York County, Pennsylvania. W. MSIKITA (1),
A. Jacob (2), F. Fofanah (2). (1) Pennsylvania
Department of Agric, Harrisburg, PA, U.S.A.;
(2) Harrisburg University of Science and Technology,
Harrisburg, PA, U.S.A.
11:15 a.m. O-247. Sequence analysis of the genes of two
isolates of grapevine leafroll-associated viruses
from Liaoning Province in China. M. Wang
(1), F. Fei (1), T. Zhou (2), Y. CHENG (3), Z.
Fan (2). (1) Department of Pomology, China
Agricultural University, Beijing, China; (2) Department
of Plant Pathology, China Agricultural
University, Beijing, China; (3) China Agricultural
University, Beijing, Peoples Rep of China
hoT ToPIC sessIon –
Wednesday Morning
The Use Of Fungicides to Promote Plant Physiological
Benefits in Crops
Wednesday, 8:30 – 11:30 a.m.; A107-109
Organizer/Moderator: James P. Mueller, Dow AgroSciences,
Brentwood, CA, U.S.A.
Sponsoring Committees: Public Policy Board; Office of
Industry Relations
Strobilurin fungicides are registered in maize and soybeans for
yield enhancement in the absence of significant foliar diseases.
Large-scale commercial testing across multiple locations
provides evidence of yield benefits. Smaller scale, replicated
field trials intended to document these effects have been
inconclusive. Yield responses are attributed to the cumulative
effect of managing multiple secondary pathogens and to direct
effects on plant metabolism such as changes in photosynthetic
efficiency and transpiration rate. Some researchers have
expressed concern about potential unintended consequences
such as selection for fungicide resistant pathogens or
suppression of beneficial fungi. This session will review the
data and provide a balanced discussion representing both sides
of the topic.
8:30 a.m. Introduction: Plant metabolic effects of
fungicides and insecticides. J. MUELLER (1).
Dow AgroSciences, Brentwood, CA, U.S.A.
8:35 a.m. Plant physiological responses to strobilurin
fungicides. E. TEDFORD (1). Syngenta Crop
Protection, Greensboro, NC, U.S.A.
8:55 a.m. Overview of small scale field testing results.
P. VINCELLI (1). University of Kentucky,
Lexington, KY, U.S.A.
9:15 a.m. Large scale field trials and statistical
considerations. P. ESKER, University of
Wisconsin, Madison, WI, U.S.A.
9:35 a.m. Pyraclostrobin: Effect on plant physiological
processes and benefit analysis. N. FASSLER (1).
BASF, Research Park Triangle, NC, U.S.A.
10:00 a.m. Break
10:15 a.m. Open forum discussion
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