Proceedings of the 22nd Annual Meeting, Southern Soybean Disease Workers (February 20-22, 1995, St. Louis, Missouri)

Contents Business session Soybean Disease Loss Estimate for the Southern United States during 1994. JA Wrather Treasurer report. GG Hammes SSDW Committee Chairmen for 1994-1995 Graduate student papers Host preference of Rotylenchulus reniformis for weed species common to Louisiana soybean. CH Carter, EC McGawley, and JS Russin Development of an immunoassay for Heterodera glycines eggs. MJ Kennedy, JE Schoelz, TL Niblack, PA Donald Effects of delayed planting and host susceptibility on colonization of soybean by Calonectria crotalariae and development of red crown rot. PU Kuruppu, JS Russin, and EC McGawley Effects of long-term corn/soybean rotation on pathogenicity of Pythium populations on soybean. BQ Zhang and XB Yang Contributed papers Possible shift to more virulent Phytophthora races in Mississippi. GL Sciumbato and BL Keeling The relationship between trehalose content and dormancy of soybean cyst nematode, Heterodera glycines. JH Yen, AL Karr, TL Niblack, and WJ Weibold Fertilization effects on Sudden Death Syndrome (SDS) in soybeans. MA Newman, AY Chambers, and DD Howard Screening southern soybean cultivars for reaction to aerial blight. BG Harville, JS Russin, and RJ Habetz Comparison of continuous soybean, fallow, and rotation with sorghum-sudan grass hybrid for nematode control in a field infested with root-knot and soybean cyst nematodes. R Rodríguez-Kábana, DB Weaver, and EL Carden Recent progress in identifying soybean cultivars field tolerance of Macrophomina phaseolina. GS Smith and ON Carvil Major soybean diseases in Brazil. JT Yorinori Pre- and post-infection efficacy of benomyl for the control of stem canker of soybean. JC Rupe and CM Becton Comparison of continuous soybean and rotation with cotton for nematode control in a field infested with root-knot and soybean cyst nematodes. DB Weaver, R Rodríguez-Kábana, and EL Carden A rapid screening method for resistance to nematodes and soilborne pathogens using alginate films. N Kokalis-Burelle, N Martínez-Ochoa, DB Weaver, and R Rodríguez-Kábana Progress of a project to identify differential cultivars and races of Cercospora sojina. DV Phillips and HR Boerma Proceedings of the Southern Soybean Disease Workers are published annually by the Southern Soybean Disease Workers. Text, references, figures, and cables are reproduced as they were submitted by the authors. The opinions exposed by the participants at this conference are their own and do not necessarily represent the views of the Southern Soybean Disease Workers. Mention of trademark, or propriety products in this Proceedings does not constitute a guarantee, warranty, or endorsement of that produce by the Southern Soybean Disease Workers

Proceedings of the 23rd Annual Meeting, Southern Soybean Disease Workers (March 24-25, 1996, Biloxi, Mississippi)

Contents Business session Soybean Disease Loss Estimate for the Southern United States during 1995. JA Wrather Treasurer report. GG Hammes SSDW Committee Chairmen for 1995-1996 Graduate student papers Effects of Bacteria Associated with Heterodera glycines in Soybean Fields of Arkansas. TK Field, RD Riggs, and TL Hart Influence of Soybean Pest Complexes on Maturation of Soybean Looper, Pseudoplusia includens. CH Carter, JS Russin, EC McGawley, DJ Boethel, and JL Griffin Contributed papers Resistance to Cyst Nematode in PI 437654 and Hartwig Soybeans. SC Ananad Rotation with Soybean Cultivar Hartwig and Nonhost Crops for Management of the Soybean Cyst Nematode. SR Koenning and KR Barker Relationship of Yield to the Development of Sudden Death Syndrome. JC Rupe Further Evaluation of Date of Planting Effects on Severity of Soybean Stem Canker. AY Chambers 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 the authors. The opinions exposed by the participants at this conference are their own and do not necessarily represent the views of the Southem Soybean Disease Workers. Mention of trademark or propriety products in this proceedings does not constitute a guarantee, warranty, or endorsement or that product by the Southern Soybean Disease Workers

Proceedings of the 21st Annual Meeting, Southern Soybean Disease Workers (March 6-8, 1994, Tulsa, Oklahoma)

Contents 1993-94 SSDW Committee Chairs 1993-94 SSDW Officers Graduate student competition Resistance of Soybean Cultivars in Maturity Group IV-VIII to Rotylenchulus reniformis. JJ Cornelius and GW Lawrence Evaluation of Susceptibility of Soybean to Red Crown Rot caused by Calonectria crotalariae in the Field. KD Kim, JS Russin, and JP Snow Contributed papers Soybean Disease Loss Estimate for the Southern United States During 1993, Table 1. Estimated percent Joss of soybean yields in 1993 to disease, Table 2. Estimated reduction of soybean yields in 1993 to disease, and Table 3. Southern states soybean disease loss estimate total in bushels and dollars, 1993. Compiled by JA Wrather Aerial Blight Associated with Delayed Maturity of Soybean. IA Fox, MA Blaine, and GL Sciumbato Relationship of Phytophthora Resistance to Soybean Yield. GL Sciumbato., FG Hancock, JA Fox, and D Boykin Effects of Long-Term Tillage Practices on Soil Populations of Microsclerotia of Macrophomina phaseolina. SR Kendig and JA Wrather Effect of Maturity Group, Growth Stage, and Planting Date on Progress of Sudden Death Syndrome of Soybean. JC Rupe and EE Gebur, Jr Additional Soybean Plant Introductions Resistant to Soybean Cyst Nematode. LD Young Frogeye Leaf Spot Control in Soybeans with Foliar-Fungicides. AY Chambers Interaction of the Root-Knot Nematode, Meloidogyne incognita, with Selected Weed Species Present in Soybean Fields in Louisiana. EC McGawley, JS Russin, and JL Griffin Population Development by Meloidogyne incognita and Heterodera glycines on Soybean Stressed by Weeds and Defoliation. JS Russin, EC McGawley, and LL Griffin Resistance to Rotylenchulus reniformis in Soybean. RT Robbins and L Rakes Treasurer\u27s report. GG Hammes 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 the authors. The opinions exposed by the participants at this conference are their own and do not necessarily represent the views of the Southern Soybean Disease Workers. Mention of trademark or propriety products in this Proceedings does not constitute a guarantee, warranty, or endorsement of that product by the Southern Soybean Disease Workers

Evaluation of soybean genotypes for reaction to natural field infection by Cercospora species causing purple seed stain.

Purple seed stain (PSS) of soybean (Glycine max (L.) Merr.) is a prevalent seed disease. It results in poor seed quality and reduced seed lot market grade, and thus undermines value of soybean worldwide. The objectives of this research were to evaluate the reaction of selected soybean genotypes collected from 15 countries representing maturity groups (MGs) III, IV, and V to PSS, and to identify new sources of resistance to PSS based on three years of evaluation of natural field infection by Cercospora spp. in the Mississippi Delta of the U. S. In this study, 42 soybean genotypes were evaluated in 2010, 2011, and 2012. Seventeen lines including six MG III (PI 88490, PI 504488, PI 417361, PI 548298, PI 437482, and PI 578486), seven MG IV (PI 404173, PI 346308, PI 355070, PI 416779, PI 80479, PI 346307, and PI 264555), and four MG V (PI 417567, PI 417420, PI 381659, and PI 407749) genotypes had significantly lower percent seed infection by Cercospora spp. than the susceptible checks and other genotypes evaluated (P ≤ 0.05). These genotypes of soybean can be used in developing soybean cultivars or germplasm lines with resistance to PSS and for genetic mapping of PSS resistance genes. In addition, among these 17 lines with different levels of resistance to PSS, nine soybean genotypes (PI 417361, PI 504488, PI 88490, PI 346308, PI 416779, PI 417567, PI 381659, PI 417567, and PI 407749) were previously reported as resistant to Phomopsis seed decay. Therefore, they could be useful in breeding programs to develop soybean cultivars with improved resistance to both seed diseases

Proceedings of the 24th Annual Meeting, Southern Soybean Disease Workers (March 15-16, 1997, Fort Walton Beach, Florida)

Contents Business session Soybean Disease Loss Estimate for the Southern United States during 1996. Compiled by PW Pratt Treasurer report. GG Hammes SSDW Committee chairmen for 1996-1997 Graduate student papers Characterization of Races of Phytophthora sojae in Arkansas and Their Effects on Commonly Grown Cultivars. TA Jackson, TL Kirkpatrick, and JC Rupe Induction of Defense Related Proteins During Compatible and Incompatible Soybean-Cercospora sojina Interactions. WA Baker, J Qiu, CB Lawrence, S Tuzun, and DB Weaver Contributed papers Performance and Cyst Nematode Resistance of Selected Soybean Cultivars in North Carolina Production Fields. SR Koenning and KR Barker Distribution and Diversity of Heterodera glycines in Delaware. RP Mulrooney, NF Gregory, and RB Carroll Foliar Fungicides for Frogeye Leaf Spot Control in Soybeans. AY Chambers Characterization and Control of Soybean Severe Stunt: A New Soilborne Virus Disease of Soybean. TA Evans, RP Mulrooney, R Taylor, and RB Carroll Results of a Preliminary Phytophthora sojae Survey in Kentucky. DE Hershman and TS Abney Reaction of Entries in the Mississippi Soybean Varietal Trials to the Common Races of Phytophthora sojae Isolated in Mississippi in 1996. GS Sciumbato, BL Keeling, JA Fox, and JA Askew The Impact of Phytophthora Root Rot, SDS, and Virus(es) on Yield in Soybean Variety Trials in Mississippi in 1996. IA Fox, GS Sciumbato, BL Keeling, and JE Askew, Jr Velvetbean and Bahiagrass Effects on Yield and Nematode Populations in a Field Infested with Root-Knot and Soybean Cyst Nematodes. DB Weaver, R Rodríguez-Kábana, and DG Robertson Velvetbean and Bahiagrass Effects on Yield and Nematode Populations in a Field Infested with Root-Knot and Other Plant-Parasitic Nematodes. R Rodríguez-Kábana, DB Weaver, CF Weaver, and DG Robertson Susceptibility of Selected Soybean Cultivars to Lesion Nematodes. R Rodríguez-Kábana, J Pinochet, DB Weaver, and PS King Estimating Soybean Yield Loss Caused by Rhizoctonia Foliar Blight. KC Stetina and JS Russi