Article
Agronomy
Maicon Balbinotti, Cleisla Molin, Julia dos Santos de Britto, Kelen Bordignon, Mauricio Barbieri, Jaqueline Huzar-Novakowiski
Summary: The study found that liming can reduce the incidence of Rhizoctonia root rot and increase soybean yield. This strategy is applicable to different soil types and contributes to improving soil fertility and disease control.
Article
Agronomy
Maicon Balbinotti, Pedro Alexandre Varella Escosteguy, Vilson Antonio Klein, Cleisla Molin, Julia dos Santos de Britto, Kelen Bordignon, Gustavo Cesar Visentini, Nadia Canali Langaro, Jaqueline Huzar-Novakowiski
Summary: There are controversies regarding the edaphic factors that may interfere with the occurrence of Rhizoctonia root rot in soybean. This study identified the chemical and physical soil attributes associated with the occurrence of the disease in a subtropical environment. The results showed that acidic soil attributes were most associated with the incidence of Rhizoctonia root rot in soybean.
Article
Biology
Nour Nissan, Benjamin Mimee, Elroy R. Cober, Ashkan Golshani, Myron Smith, Bahram Samanfar
Summary: This article reviews the research on soybean resistance to the soybean cyst nematode, providing an understanding of the mechanisms of resistance and identifying areas for further exploration. Understanding the host-pathogen relationship is essential for effectively breeding resistant crops in order to overcome the negative effects of plant pathogens.
Article
Plant Sciences
Srikanth Kodati, Nikita Gambir, Gary Yuen, Anthony O. Adesemoye, Sydney E. Eyerhart
Summary: Accurate identification of Rhizoctonia species causing disease is crucial for soybean disease management. This study surveyed the prevalence and aggressiveness of different Rhizoctonia species in Nebraska, and evaluated their cross-pathogenicity to corn and wheat.
Article
Agronomy
Gabriel Camatti, Fabio Mulinari dos Santos, Gerson Luis dos Santos Rodrigues, Darcila Pereira Camargo, Gabrieli Stefanello Manfio, Jansen Rodrigo Pereira Santos, Julio Carlos Pereira da Silva
Summary: This study investigated the efficacy of microorganism-based products, including Bacillus and Trichoderma, against the potential parasite Helicotylenchus dihystera in soybean. The products killed the nematodes by producing toxic compounds or emitting volatile substances, leading to improved soybean growth in infested soil.
Article
Plant Sciences
Teeranai Poti, Tanapol Thitla, Naphatsawan Imaiam, Hatthaya Arunothayanan, Chanintorn Doungsa-ard, Pornprapa Kongtragoul, Sarunya Nalumpang, Kazuya Akimitsu
Summary: The soybean anthracnose-causing pathogen, Colletotrichum truncatum, in Thailand has developed resistance to multiple fungicides commonly used for its control. The study monitored fungicide resistance in C. truncatum isolates from fields in Chiang Rai and Chiang Mai from 2019 to 2020. Results showed that a significant percentage of isolates exhibited resistance to carbendazim (Car), azoxystrobin (Azo), difenoconazole (Dif), and penthiopyrad (Pen). The resistant isolates carried specific mutations in target genes. This study serves as a warning about the occurrence and distribution of multiple-fungicide-resistant populations of C. truncatum in soybean fields.
Article
Plant Sciences
Krishna Acharya, Guiping Yan, Addison Plaisance
Summary: Microplot experiments were conducted to evaluate the effects of cover crops on population reduction of soybean cyst nematode in 2016 and 2017. The results showed that most cover crops had better SCN population reduction effects compared to fallow over two years, with annual ryegrass and daikon radish performing the best.
Review
Agronomy
Maria C. Rodriguez, Francisco Sautua, Mercedes Scandiani, Marcelo Carmona, Sebastian Asurmendi
Summary: Increasing food production requires reducing damage from plant pathogens, with focus on soil-borne pathogens like those affecting soybean crop yield. Current management strategies for soybean sudden death syndrome (SDS) are limited, calling for innovative approaches including plant nutrition, biological control, and breeding techniques.
PEST MANAGEMENT SCIENCE
(2021)
Article
Plant Sciences
Bennett C. Harrelson, Robert C. Kemerait, Albert K. Culbreath, Bikash Ghimire, Zenglu Li, Paul M. Severns, James W. Buck
Summary: Frogeye leaf spot (FLS), caused by Cercospora sojina, is a major foliar disease affecting soybean production worldwide. In the U.S., management of FLS relies on resistant cultivars and fungicide applications, but fungicide resistance has been observed. A study in Georgia identified C. sojina isolates resistant to QoI fungicides, and evaluated the effectiveness of two fungicides at different concentrations against these isolates.
Article
Plant Sciences
Jhonatan P. Barro, Emerson M. Del Ponte, Tom W. Allen, Jason P. Bond, Travis R. Faske, Clayton A. Hollier, Yuba R. Kandel, Daren S. Mueller, Heather M. Kelly, Nathan M. Kleczewski, Keith A. Ames, Paul P. Price, Edward J. Sikora, Carl A. Bradley
Summary: This study collected and analyzed data from uniform fungicide trials conducted in eight states in the United States to evaluate the efficacy and profitability of different fungicides for frogeye leaf spot (FLS) in soybean. The results showed that DIFE + PYDI fungicide had the highest efficacy, while PYRA fungicide had the lowest efficacy, and the efficacy of some fungicides declined over time. These findings provide valuable information for decision making in fungicide programs.
Article
Agronomy
Matheus Mereb Negrisoli, Flavio Nunes da Silva, Raphael Mereb Negrisoli, Lucas da Silva Lopes, Francisco de Sales Souza Junior, Bianca Rezende de Freitas, Edivaldo Domingues Velini, Carlos Gilberto Raetano
Summary: The application of remote sensing techniques and prediction models can affect the timing and efficacy of fungicide application for soybean rust control. This study evaluated the use of a prediction model as a threshold for disease control decision-making and examined the impact of different application timings on rust control and spraying technology.
Article
Plant Sciences
Pratibha Sharma, Dean K. Malvick, Ashok K. Chanda
Summary: This study evaluated the sensitivity of R. solani AG 2-2 isolates collected from soybean and sugar beet in Minnesota and North Dakota to fungicides. The results showed that there were differences in the effectiveness of QoI and SDHI fungicides on these isolates.
Article
Plant Sciences
Harun M. Murithi, Michelle Pawlowski, Tizazu Degu, Deresse Hunde, Molla Malede, Tonny Obua, Hapson Mushoriwa, Danny Coyne, Phinehas Tukamuhabwa, Glen L. Hartman
Summary: Red leaf blotch (RLB), caused by the fungus Coniothyrium glycines, is an important disease of soybean in Africa. Fungicides can be used to manage the disease, but host resistance may be a better option. This study evaluated 59 soybean entries in nine locations and found a correlation between rainfall, wind speed, and RLB severity.
Article
Agronomy
Carolina C. Saulle, Alexandre Claus, Leticia de A. Sales, Alan G. Goncalves, Diogo R. B. Ducatti, Miguel D. Noseda, Louise L. May De Mio
Summary: Photodynamic inactivation (PDI) can be an important alternative method to combat major grain legume pathogens, significantly reducing infection rates through the combined action of photosensitizers, light, and molecular oxygen.
Article
Biochemistry & Molecular Biology
Rita Zrenner, Bart Verwaaijen, Franziska Genzel, Burkhardt Flemer, Rita Grosch
Summary: In this study, the molecular response of potatoes to Rhizoctonia solani AG3 was evaluated through dual RNA sequencing, revealing the upregulation of genes involved in anti-fungal defense and hormone pathways. The findings suggest potential breeding strategies for cultivars with higher resistance to black scurf disease or the development of new control methods.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Plant Sciences
Linda M. Hebb, Carl A. Bradley, Santiago Xavier Mideros, Darcy E. P. Telenko, Kiersten Wise, Anne E. Dorrance
Summary: This study investigated the pathotype and genetic diversity of Phytophthora sojae, the causal agent of Phytophthora root and stem rot of soybean, in soil samples from Illinois, Indiana, Kentucky, and Ohio. The results showed that there was a moderate level of population differentiation between these states and also between fields within the same state. Cluster analysis detected the presence of P. sojae population structure across neighboring states. The findings support the hypothesis of occasional outcrossing events and highlight the potential impact of gene flow on resistance genes.
Article
Plant Sciences
Mirian F. Pimentel, Erika Arnao, Amanda J. Warner, Leonardo F. Rocha, Arjun Subedi, Nariman Elsharif, Martin Chilvers, Rashelle Matthiesen, Alison E. Robertson, Carl A. Bradley, Danilo L. Neves, Dianne K. Pedersen, Ursula Reuter-Carlson, Jonathan Lacey, Jason P. Bond, Ahmad M. Fakhoury
Summary: This study investigated the antagonistic activity of potential biological control agents (BCAs) native to the U.S. Midwest against Pythium spp. In vitro screening and scanning electron microscopy observations revealed inhibitory activity and mycoparasitic characteristics of certain BCAs against Pythium spp. Under field conditions, selected BCAs protected soybean seedlings from Pythium spp. infection and could be used in combination with fungicide seed treatments.
Editorial Material
Plant Sciences
Danilo L. Neves, Brandt G. Berghuis, Jessica M. Halvorson, Bryan C. Hansen, Samuel G. Markell, Carl A. Bradley
Summary: Frogeye leaf spot is a significant foliar disease of soybean in the US caused by Cercospora sojina. The use of quinone outside inhibitor (QoI) fungicides has been an effective method to control the disease, but the discovery of QoI-resistant C. sojina isolates in Tennessee and other states has raised concerns. Recent research has revealed the presence of QoI-resistant C. sojina isolates in North Dakota, which contain the G143A mutation. Therefore, soybean farmers in North Dakota will need to employ integrated strategies to manage the disease.
PLANT HEALTH PROGRESS
(2022)
Editorial Material
Plant Sciences
Danilo L. Neves, Richard W. Webster, Damon L. Smith, Carl A. Bradley
PLANT HEALTH PROGRESS
(2022)
Article
Plant Sciences
Danilo L. Neves, Aiqin Wang, Japheth D. Weems, Heather M. Kelly, Daren S. Mueller, Mark Farman, Carl A. Bradley
Summary: Brown spot, a common foliar disease of soybean caused by Septoria glycines, has developed resistance to QoI fungicides. By analyzing the cytochrome b gene, researchers discovered a mutation at codon 143 that is associated with QoI fungicide resistance. A PCR assay was successfully developed to distinguish between sensitive and resistant isolates. The study found that 47.5% of S. glycines isolates tested were resistant to QoI fungicides.
Article
Plant Sciences
Nathaniel H. H. White, Danilo L. L. Neves, Etta M. M. Nuckles, Lisa J. J. Vaillancourt, Jiawen Zhang, Guirong Zhang, Carl A. A. Bradley
Summary: Stagonospora leaf and glume blotch caused by Parastagonospora nodorum is a major disease of winter wheat in the United States. It reduces grain yield and quality significantly. The disease is more concerning in no-till farming systems where pathogens overwinter in crop residue. The reliance on foliar fungicides, such as quinone outside inhibitor (QoI), for disease management has led to the development of resistance in P. nodorum isolates.
Article
Plant Sciences
Nathan M. Kleczewski, Carl A. Bradley, Glen Hartman, Yuba Kandel, Daren Mueller, Lina Rodriguez Salamanca
Summary: Calonectria ilicicola is a soilborne fungus that causes red crown rot on soybeans. This guide provides methods for identifying the disease through host symptomology, molecular, and morphological techniques. It also describes methods for isolating, storing, and working with the fungus.
PLANT HEALTH PROGRESS
(2023)
Article
Plant Sciences
Nathaniel H. White, Timothy S. Stombaugh, Carl A. Bradley
Summary: Fusarium head blight (FHB), caused primarily by Fusarium graminearum, is a major disease affecting wheat in Kentucky. It reduces grain yields and quality, including test weights and mycotoxin contamination. This study found that nozzle configurations and sprayer speeds had only minor effects on the coverage of simulated wheat heads and FHB management. Adjusting sprayer speed may be necessary for maximum FHB control depending on the nozzle configuration used.
PLANT HEALTH PROGRESS
(2023)
Article
Agronomy
David A. A. Van Sanford, Anthony J. J. Clark, Carl Bradley, Gina L. L. Brown-Guedira, Christina Cowger, Yanhong Dong, Byung-Kee Baik
Summary: Kentucky's wheat crop is at risk for Fusarium head blight (FHB) due to overwintering of the causal agent in corn stubble. The University of Kentucky wheat breeding program aims to release FHB-resistant winter wheat cultivars. 'Pembroke 2021' is an early-maturing, semi-dwarf, soft red winter wheat cultivar developed and released for its FHB resistance, high yield potential, and lodging resistance.
JOURNAL OF PLANT REGISTRATIONS
(2023)
Article
Plant Sciences
Natalia Pineros-Guerrero, Danilo L. Neves, Carl A. Bradley, Darcy E. P. Telenko
Summary: QoI-resistant Cercospora sojina isolates are widely spread throughout Indiana, with 29 counties being affected. These isolates showed cross-resistance to QoI fungicides and were confirmed to be resistant through PCR-RFLP results. The study also identified the G143A mutation as the cause of resistance to QoI fungicides.
Article
Plant Sciences
Linda M. Hebb, Carl A. Bradley, Darcy E. P. Telenko, Kiersten Wise, Anne E. Dorrance
Summary: Soybean's soilborne oomycete pathogens are a constant concern, especially during the seedling growth stage. A survey conducted between 2016 and 2018 found 126 isolates of Phytophthora sansomeana through soil bating, with 42 from Indiana, 9 from Kentucky, and 75 from Ohio. Pathogenicity testing revealed that P. sansomeana isolates were more aggressive seed rotters than P. sojae and Pythium isolates, but developed smaller tap root lesions on soybean seedlings.
PLANT HEALTH PROGRESS
(2023)
Article
Plant Sciences
Travis R. Faske, John Mueller, J. Ole Becker, Ernest C. Bernard, Carl Bradley, Jason Bond, Johan Desager, Jonathan Eisenback, Zane Grabau, Jiahuai Hu, Robert Kemerait, Alyssa Koehler, Kathy Lawrence, Hillary Mehl, Rachel E. Rudolph, Edward J. Sikora, Steve Thomas, Nathan Walker, Terry Wheeler, Allen J. Wrather, Weimin Ye, Lei Zhang
Summary: This report summarizes the distribution of M. incognita on field crops by county for each state across the continental United States.
PLANT HEALTH PROGRESS
(2023)
Article
Multidisciplinary Sciences
Austin G. McCoy, Richard R. Belanger, Carl A. Bradley, Daniel G. Cerritos-Garcia, Vinicius C. Garnica, Loren J. Giesler, Pablo E. Grijalba, Eduardo Guillin, Maria A. Henriquez, Yong Min Kim, Dean K. Malvick, Rashelle L. Matthiesen, Santiago X. Mideros, Zachary A. Noel, Alison E. Robertson, Mitchell G. Roth, Clarice L. Schmidt, Damon L. Smith, Adam H. Sparks, Darcy E. P. Telenko, Vanessa Tremblay, Owen Wally, Martin I. Chilvers
Summary: This study reveals an increase in pathotype diversity of Phytophthora sojae isolates and a decrease in the efficacy of specific Rps genes used for disease management. The widely deployed Rps1a, Rps1c, and Rps1k genes in the United States, Argentina, and Canada are no longer effective, highlighting the need for new sources of resistance to effectively manage Phytophthora stem and root rot.
NATURE COMMUNICATIONS
(2023)
Article
Plant Sciences
Karthika Mohan, Brian Kontz, Paul Okello, Tom W. Allen, Gary C. Bergstrom, Kaitlyn Bissonnette, John Bonkowski, Carl A. Bradley, James Buck, Martin I. Chilvers, Anne Dorrance, Loren Giesler, Heather Kelly, Alyssa Koehler, Horacio D. Lopez-Nicora, Dylan Mangel, Samuel G. Markell, Daren Mueller, Paul P. Price III, Alejandro Rojas, Madalyn Shires, Damon Smith, Terry Spurlock, Richard W. Webster, Kiersten Wise, Dalitso Yabwalo, Febina M. Mathew
Summary: In this study, four accessions from the USDA Soybean Germplasm Collection with reported resistance to Diaporthe aspalathi, D. caulivora, or D. longicolla were evaluated using geographically representative isolates within each species from the United States. The results showed that different accessions responded differently to different isolates, indicating possible genetic variation for resistance within these accessions.
PLANT HEALTH PROGRESS
(2023)
Review
Plant Sciences
Jhonatan P. P. Barro, Danilo L. L. Neves, Emerson M. M. Del Ponte, Carl A. A. Bradley
Summary: Frogeye leaf spot (FLS), caused by Cercospora sojina, is an economically important disease of soybean. It leads to reduced photosynthetic leaf area, premature defoliation, and reduced seed weight. Many questions regarding the biology, genetic variability, and pathotype structure of the pathogen remain unanswered.
TROPICAL PLANT PATHOLOGY
(2023)
