Proceedings of the 30th Annual Meeting, Southern Soybean Disease Workers (March 3, 2003, Little Rock, Arkansas)

Contents Southern Soybean Disease Workers 2002 treasury report. James Bond United States Soybean Disease Loss Estimate for 2002. Compiled by Stephen R. Koenning Evaluation of Reduced Rates and Timing of Azoxystrobin on Frogeye Leaf Spot Cliff M Coker Effect of Fungicides on Soybean Disease, Yield and Seed Quality. RW Schneider, JD Siebert, CA Jones, and JL Griffin Effect of Fungicide Seed Treatment on Soybean Establishment. ML Rosso, C Boger, G Bates, C Rothrock, T Kirkpatrick, and J Rupe Influence of Soybean Cyst Nematode on Sudden Death Syndrome Development in Field Microplots in Arkansas. SL Giammaria, CB Boger, and JC Rupe Possible Mechanism for Resistance to Pythium spp. in the Soybean Cultivar Archer. GD Bates, CS Rothrock, and JC Rupe Late Season Diseases Have Major Impact on Soybean Crop in Mississippi in 2001 and 2002. GL Sciumbato and Alemu Mengistu Identification and Characterization of Soybean Germplasm with Resistance to Seed Infection by Phomopsis longicolla and Cercospora kikuchii. Eric W Jackson, P Fenn, and PK Miller Soybean Green Stem Caused by Selected Strains of BPMV. You-Keng Goh, Said A Ghabrial, John S Russin, and Jason P Bond Meloidogyne incognita, Moving on to Greener Pastures. Jonathan B Allen, Jason P Bond, and Michael E Schmidt Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and tables are reproduced as they were submitted by authors. The opinions expressed by the participants at this conference are their own and do not necessarily represent those of the Southern Soybean Workers. Mention of a trademark or proprietary products in this publication does not constitute a guarantee, warranty, or endorsement of that product by the Southern Soybean Disease Workers

Proceedings of the 35th Annual Meeting, Southern Soybean Disease Workers (March 12-13, 2008, Pensacola, Florida)

Contents Southern United States Soybean Disease Loss Estimate for 2007. Compiled by SR Koenning Contributed papers (Clayton Hollier, moderator) Effects of Row Spacing and Leaf Wetness on the Temporal and Spatial Spread of Soybean Rust within Soybean Canopies. DF Narváez, JJ Marois, DL Wright, and S Isard Effects of Potassium, Chloride, and Minor Elements Nutrition on Asian Soybean Rust. RW Schneider, EP Mumma, CL Clark, and CG Giles The Impact of Selected Fungicide Treatments on Disease Progress of Asian Soybean Rust and Other Diseases of Soybean. GB Padgett, MA Purvis, A Hogan, and S Martin Soybean Sudden Death Syndrome Variety Testing at Southern Illinois University. C Herzog, C Schmidt, and M Schmidt Soybean Yield Suppression Due to Diseases for the Top Eight Soybean-Producing Countries in 2006. A Wrather, S Koenning, R Balardin, LH Carregal, R Escobar, GK Gupta, Z Ma, W Morel, LD Ploper, and A Tenuta Impact of Frogeye Leaf Spot on Soybean Yield in the Lower Midwest. CM Vick, AK Vick, JP Bond, and JA Wrather Graduate student papers (Alemu Mengistu, moderator) Laboratory Evaluation of Soybean Resistance to Pod Blight Caused by Cercospora kikuchii. BC Wells and GL Sciumbato Temporal Dynamics of Root and Foliar Symptoms of Soybean Sudden Death Syndrome at Different Inoculum Densities. C Gongora-Canul, FW Nutter, Jr, and LFS Leandro Discussion session (Allen Wrather, moderator) Soybean Rust Sentinal Survey discussion. Don Hershman Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and tables are reproduced as they were submitted by authors. The opinions expressed by the participants at this conference are their own and do not necessarily represent those of the Southern Soybean Disease Workers. Mention of a trademark or proprietary products in this publication does not constitute a guarantee, warranty, or endorsement of that product by the Southern Soybean Disease Workers

Proceedings of the 33rd Annual Meeting, Southern Soybean Disease Workers (March 8-9, 2006, Jackson, Tennessee)

Contents Southern Soybean Disease Workers 2005 treasury report Southern United States Soybean Disease Loss Estimates for 2005. Compiled by SR Koenning Virulence in Phytopbthora sojae Isolates to Soybeans with Rps8 Resistance. DA Smith, TS Abney, and JG Shannon New Sources of Resistance to SCN in Soybean. PR Arelli Soybean Disease Management in Louisiana. B Padgett, MA Purvis, and BW Garber Efficacy and Profitability of Foliar Fungicide in the Absence of Soybean Rust. M Newman and W Percell Fungicide and Insecticide Combinations for Enhancing Soybean Health and Yield. RP Mulrooney and RW Taylor Overview of Soybean Rust Monitoring in the US. JC Rupe Yield Enhancement of Probable Asian Soybean Rust Control Fungicides. JB Blessitt, DH Poston, GL Sciumbato, CH Koger, and N Buehring Occurrence of Disease and Insect Pests in Select Sorghum and Soybean Rotations in Mississippi. ST Pichardo, RE Baird, and HN Pitre A Preliminary Evaluation of Spore Trapping Technology for Phakopsora pachyrhizi. EP Mumma, RW Schneider, CL Robertson, CG Giles, JJ Marois, and DL Wright Influence of Host Genotype and Soybean Cyst Nematode on Charcoal Rot of Soybean. TM Dorton, JP Bond, ME Schmidt, CM Vick, and AK Gregor Comparison of Disease Assessments of Soybean Genotypes in the Presence of Charcoal Rot. A Mengistu, RL Paris, JR Smith, and JD Ray Twenty Years of Soybean Variety Testing for SDS. C Schmidt, J Klein, M Schmidt, and J Bond SCN-Resistant Soybeans Offer a False Sense of Security to Producers. R Heinz, LE Sweets, and MG Mitchum Roundup Ready and Conventional Soybeans with Broad Resistance to SCN HG Types. JG Shannon, JA Wrather, DA Sleper, HT Nguyen, and SC Anand A Review ofReniform Nematode Resistance on Soybean. RT Robbins Effect of Seed Treatments on Soybean Stand and Yield in Arkansas, 2005. JC Rupe, CS Rothrock, TL Kirkpatrick, ML Rosso, and AJ Steger Inheritance of Resistance to Phomopsis Seed Decay in Soybean PI 360841. SE Smith, P Fenn, PK Miller, and P Chen Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and tables are reproduced as they were submitted by authors. The opinions expressed by the participants at this conference are their own and do not necessarily represent those of the Southern Soybean Disease Workers. Mention of a trademark or proprietary products in this publication does not constitute a guarantee, warranty, or endorsement of that product by the Southern Soybean Disease Workers

Corn Yield Loss Estimates Due to Diseases in the United States and Ontario, Canada from 2012 to 2015

Annual decreases in corn yield caused by diseases were estimated by surveying members of the Corn Disease Working Group in 22 corn-producing states in the United States and in Ontario, Canada, from 2012 through 2015. Estimated loss from each disease varied greatly by state and year. In general, foliar diseases such as northern corn leaf blight, gray leaf spot, and Goss’s wilt commonly caused the largest estimated yield loss in the northern United States and Ontario during nondrought years. Fusarium stalk rot and plant-parasitic nematodes caused the most estimated loss in the southern-most United States. The estimated mean economic loss due to yield loss by corn diseases in the United States and Ontario from 2012 to 2015 was $76.51 USD per acre. The cost of disease-mitigating strategies is another potential source of profit loss. Results from this survey will provide scientists, breeders, government, and educators with data to help inform and prioritize research, policy, and educational efforts in corn pathology and disease management