1
|
Han J, Ficca A, Kleczewski N, Schroeder N. Effect of Fluopyram on Pratylenchus penetrans on Corn in the Field and In Vitro. Plant Dis 2024; 108:342-347. [PMID: 37480247 DOI: 10.1094/pdis-04-23-0725-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
The effects of a fluopyram seed treatment on lesion nematodes (Pratylenchus spp.) and other plant-parasitic nematodes (PPNs) were evaluated on corn in multiple field locations in 2020 and 2021. The highest rate of fluopyram seed treatment (0.15 mg seed-1) reduced early season population density of lesion nematodes compared with the base treatment control in 2020 only. However, fluopyram did not affect late season lesion nematode population density and corn yields. Fluopyram seed treatment also had minimal or nonsignificant effects on other PPN species. Based on these results, the effects of fluopyram were tested in vitro on Pratylenchus penetrans. Results demonstrated that fluopyram severely affected motility in P. penetrans. The sensitivity of P. penetrans second-stage juveniles (J2s) to fluopyram was significantly higher than at J4 and adult, suggesting that sensitivity to fluopyram is dependent on developmental stage. In addition, the effects of fluopyram were reversible at an EC50 but were irreversible at the maximum concentration (25 μg/ml). Overall, our results indicate that fluopyram has potential for controlling P. penetrans, but its efficacy is variable depending on nematode developmental stage and chemical concentration. Further research is needed to determine if these impacts can translate to field scenarios.
Collapse
Affiliation(s)
- Jaeyeong Han
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801
| | - Alyson Ficca
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801
| | - Nathan Kleczewski
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801
- GROWMARK Member Services, Bloomington, IL 61701
| | - Nathan Schroeder
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801
| |
Collapse
|
2
|
Dady ER, Kleczewski N, Ugarte CM, Ngumbi E. Plant Variety, Mycorrhization, and Herbivory Influence Induced Volatile Emissions and Plant Growth Characteristics in Tomato. J Chem Ecol 2023; 49:710-724. [PMID: 37924424 DOI: 10.1007/s10886-023-01455-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Revised: 09/06/2023] [Accepted: 09/13/2023] [Indexed: 11/06/2023]
Abstract
Plants produce a range of volatile organic compounds (VOCs) that mediate vital ecological interactions between herbivorous insects, their natural enemies, plants, and soil dwelling organisms including arbuscular mycorrhizal fungi (AMF). The composition, quantity, and quality of the emitted VOCs can vary and is influenced by numerous factors such as plant species, variety (cultivar), plant developmental stage, root colonization by soil microbes, as well as the insect developmental stage, and level of specialization of the attacking herbivore. Understanding factors shaping VOC emissions is important and can be leveraged to enhance plant health and pest resistance. In this greenhouse study, we evaluated the influence of plant variety, mycorrhizal colonization, herbivory, and their interactions on the composition of emitted volatiles in tomato plants (Solanum lycopersicum L.). Four tomato varieties from two breeding histories (two heirlooms and two hybrids), were used. Tomato plants were inoculated with a commercial inoculum blend consisting of four species of AMF. Plants were also subjected to herbivory by Manduca sexta (Lepidoptera: Sphingidae L.) five weeks after transplanting. Headspace volatiles were collected from inoculated and non-inoculated plants with and without herbivores using solid phase-microextraction. Volatile profiles consisted of 21 different volatiles in detectable quantities. These included monoterpenes, sesquiterpenes, and alkane hydrocarbons. We documented a strong plant variety effect on VOC emissions. AMF colonization and herbivory suppressed VOC emissions. Plant biomass was improved by colonization of AMF. Our results show that mycorrhization, herbivory and plant variety can alter tomato plant VOC emissions and further shape volatile-mediated insect and plant interactions.
Collapse
Affiliation(s)
- Erinn R Dady
- Department of Entomology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | | | - Carmen M Ugarte
- Department of Natural Resources and Environmental Sciences, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA
| | - Esther Ngumbi
- Department of Entomology, University of Illinois Urbana-Champaign, Urbana, IL, 61801, USA.
| |
Collapse
|
3
|
Webster RW, Nicolli C, Allen TW, Bish MD, Bissonnette K, Check JC, Chilvers MI, Duffeck MR, Kleczewski N, Luis JM, Mueller BD, Paul PA, Price PP, Robertson AE, Ross TJ, Schmidt C, Schmidt R, Schmidt T, Shim S, Telenko DEP, Wise K, Smith DL. Uncovering the environmental conditions required for Phyllachora maydis infection and tar spot development on corn in the United States for use as predictive models for future epidemics. Sci Rep 2023; 13:17064. [PMID: 37816924 PMCID: PMC10564858 DOI: 10.1038/s41598-023-44338-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Accepted: 10/06/2023] [Indexed: 10/12/2023] Open
Abstract
Phyllachora maydis is a fungal pathogen causing tar spot of corn (Zea mays L.), a new and emerging, yield-limiting disease in the United States. Since being first reported in Illinois and Indiana in 2015, P. maydis can now be found across much of the corn growing regions of the United States. Knowledge of the epidemiology of P. maydis is limited but could be useful in developing tar spot prediction tools. The research presented here aims to elucidate the environmental conditions necessary for the development of tar spot in the field and the creation of predictive models to anticipate future tar spot epidemics. Extended periods (30-day windowpanes) of moderate mean ambient temperature (18-23 °C) were most significant for explaining the development of tar spot. Shorter periods (14- to 21-day windowpanes) of moisture (relative humidity, dew point, number of hours with predicted leaf wetness) were negatively correlated with tar spot development. These weather variables were used to develop multiple logistic regression models, an ensembled model, and two machine learning models for the prediction of tar spot development. This work has improved the understanding of P. maydis epidemiology and provided the foundation for the development of a predictive tool for anticipating future tar spot epidemics.
Collapse
Affiliation(s)
- Richard W Webster
- Department of Plant Pathology, North Dakota State University, Fargo, ND, 58108, USA
| | - Camila Nicolli
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Tom W Allen
- Delta Research and Extension Center, Mississippi State University, Stoneville, MS, 38776, USA
| | - Mandy D Bish
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Kaitlyn Bissonnette
- Division of Plant Science and Technology, University of Missouri, Columbia, MO, 65211, USA
| | - Jill C Check
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, USA
| | - Martin I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, 48824, USA
| | - Maíra R Duffeck
- Department of Plant Pathology, The Ohio State University, Wooster, OH, 44691, USA
| | - Nathan Kleczewski
- Department of Crop Sciences, University of Illinois, Urbana, IL, 61801, USA
| | - Jane Marian Luis
- Department of Plant Pathology, The Ohio State University, Wooster, OH, 44691, USA
| | - Brian D Mueller
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Pierce A Paul
- Department of Plant Pathology, The Ohio State University, Wooster, OH, 44691, USA
| | - Paul P Price
- Macon Ridge Research Station, LSU AgCenter, Winnsboro, LA, 71295, USA
| | - Alison E Robertson
- Department of Plant Pathology, Entomology, and Microbiology, Iowa State University, Ames, IA, 50011, USA
| | - Tiffanna J Ross
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA
| | - Clarice Schmidt
- Department of Plant Pathology, Entomology, and Microbiology, Iowa State University, Ames, IA, 50011, USA
| | - Roger Schmidt
- Nutrient and Pest Management Program, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Teryl Schmidt
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Sujoung Shim
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA
| | - Darcy E P Telenko
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, 47907, USA
| | - Kiersten Wise
- Department of Plant Pathology, University of Kentucky, Princeton, KY, 42445, USA
| | - Damon L Smith
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI, 53706, USA.
| |
Collapse
|
4
|
Góngora-Canul C, Jiménez-Beitia FE, Puerto-Hernández C, Avellaneda C MC, Kleczewski N, Telenko DEP, Shim S, Solórzano JE, Goodwin SB, Scofield SR, Cruz CD. Assessment of symptom induction via artificial inoculation of the obligate biotrophic fungus Phyllachora maydis (Maubl.) on corn leaves. BMC Res Notes 2023; 16:69. [PMID: 37143103 PMCID: PMC10161612 DOI: 10.1186/s13104-023-06341-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Accepted: 04/21/2023] [Indexed: 05/06/2023] Open
Abstract
OBJECTIVE Tar spot is a foliar disease of corn caused by Phyllachora maydis, which produces signs in the form of stromata that bear conidia and ascospores. Phyllachora maydis cannot be cultured in media; therefore, the inoculum source for studying tar spot comprises leaves with stromata collected from naturally infected plants. Currently, there is no effective protocol to induce infection under controlled conditions. In this study, an inoculation method was assessed under greenhouse and growth chamber conditions to test whether stromata of P. maydis could be induced on corn leaves. RESULTS Experiments resulted in incubation periods ranging between 18 and 20 days and stromata development at the beginning of corn growth stage VT-R1 (silk). The induced stromata of P. maydis were confirmed by microscopy, PCR, or both. From thirteen experiments conducted, four (31%) resulted in the successful production of stromata. Statistical analyses indicate that if an experiment is conducted, there are equal chances of obtaining successful or unsuccessful infections. The information from this study will be valuable for developing more reliable P. maydis inoculation methods in the future.
Collapse
Affiliation(s)
- Carlos Góngora-Canul
- Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA
- Tecnologico Nacional de México, Instituto Tecnológico de Conkal, 97345, Conkal, Yucatán, Mexico
| | - Fidel E Jiménez-Beitia
- Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA
| | - Carlos Puerto-Hernández
- Escuela Agrícola Panamericana Zamorano, Francisco Morazan, 93, San Antonio de Oriente, Honduras
| | | | - Nathan Kleczewski
- Department of Crop Science, University of Illinois, 61801, Urbana, IL, USA
| | - Darcy E P Telenko
- Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA
| | - Sujoung Shim
- Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA
| | - José E Solórzano
- Department of Plant Pathology, University of Minnesota, 55108, St. Paul, MN, USA
| | - Stephen B Goodwin
- Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA
- Crop Production and Pest Control Research Unit, USDA-Agricultural Research Service, 47907, West Lafayette, IN, USA
- Department of Agronomy, Purdue University, West Lafayette, IN, 47907, USA
| | - Steven R Scofield
- Crop Production and Pest Control Research Unit, USDA-Agricultural Research Service, 47907, West Lafayette, IN, USA
- Department of Agronomy, Purdue University, West Lafayette, IN, 47907, USA
| | - C D Cruz
- Department of Botany and Plant Pathology, Purdue University, 47907, West Lafayette, IN, USA.
| |
Collapse
|
5
|
Kleczewski N, Geisler S. Assessment of Selected Commercially Available Seed Treatments on Suppressing the Effects of Red Crown Rot on Soybeans Under a Controlled Environment. Plant Dis 2022; 106:2060-2065. [PMID: 35285255 DOI: 10.1094/pdis-10-21-2237-re] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Calonectria ilicicola is a soilborne fungus responsible for red crown rot (RCR) in soybeans. Recently, this disease has been detected in new areas within the United States and Asia, where it has been reported to cause significant yield losses. To date, no data on the efficacy of fungicide seed treatments for suppressing RCR in soybeans are available. We screened three commercially available soybean seed treatments (Acceleron STANDARD; Acceleron STANDARD + IleVO; Cruiser MAXX + Saltro) for impacts on germination, seedling growth, and disease caused by C. ilicicola under controlled laboratory conditions. The Cruiser MAXX + Saltro treatment improved final plant dry mass to levels similar to noninoculated controls. Both Acceleron STANDARD + IleVO and Cruiser MAXX + Saltro reduced percent root rot. Acceleron STANDARD alone did not impact root rot, indicating that the IleVO component was efficacious on C. ilicicola. These data indicate that IleVO and Cruiser MAXX + Saltro have potential for reducing early season impacts of RCR in soybeans. Future work assessing these seed treatments in field-grown soybeans is needed to better understand the role of seed treatments as components of an integrated management program for RCR.
Collapse
|
6
|
Valle-Torres J, Ross TJ, Plewa D, Avellaneda MC, Check J, Chilvers MI, Cruz AP, Dalla Lana F, Groves C, Gongora-Canul C, Henriquez-Dole L, Jamann T, Kleczewski N, Lipps S, Malvick D, McCoy AG, Mueller DS, Paul PA, Puerto C, Schloemer C, Raid RN, Robertson A, Roggenkamp EM, Smith DL, Telenko DEP, Cruz CD. Tar Spot: An Understudied Disease Threatening Corn Production in the Americas. Plant Dis 2020; 104:2541-2550. [PMID: 32762502 DOI: 10.1094/pdis-02-20-0449-fe] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Tar spot of corn has been a major foliar disease in several Latin American countries since 1904. In 2015, tar spot was first documented in the United States and has led to significant yield losses of approximately 4.5 million t. Tar spot is caused by an obligate pathogen, Phyllachora maydis, and thus requires a living host to grow and reproduce. Due to its obligate nature, biological and epidemiological studies are limited and impact of disease in corn production has been understudied. Here we present the current literature and gaps in knowledge of tar spot of corn in the Americas, its etiology, distribution, impact and known management strategies as a resource for understanding the pathosystem. This will in tern guide current and future research and aid in the development of effective management strategies for this disease.
Collapse
Affiliation(s)
- J Valle-Torres
- Zamorano University, San Antonio de Oriente, Fco. Morazán, Honduras
| | - T J Ross
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A
| | - D Plewa
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801, U.S.A
| | - M C Avellaneda
- Zamorano University, San Antonio de Oriente, Fco. Morazán, Honduras
| | - J Check
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - M I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - A P Cruz
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A
| | - F Dalla Lana
- Department of Plant Pathology, The Ohio State University, Wooster, OH 44691, U.S.A
| | - C Groves
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706, U.S.A
| | - C Gongora-Canul
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A
| | - L Henriquez-Dole
- Zamorano University, San Antonio de Oriente, Fco. Morazán, Honduras
| | - T Jamann
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801, U.S.A
| | - N Kleczewski
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801, U.S.A
| | - S Lipps
- Department of Crop Sciences, University of Illinois, Urbana, IL 61801, U.S.A
| | - D Malvick
- Department of Plant Pathology, University of Minnesota, St. Paul, MN 55108, U.S.A
| | - A G McCoy
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - D S Mueller
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011, U.S.A
| | - P A Paul
- Department of Plant Pathology, The Ohio State University, Wooster, OH 44691, U.S.A
| | - C Puerto
- Zamorano University, San Antonio de Oriente, Fco. Morazán, Honduras
| | - C Schloemer
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A
| | - R N Raid
- IFAS Everglades Research and Education Center, University of Florida, Belle Glade, FL 33430, U.S.A
| | - A Robertson
- Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011, U.S.A
| | - E M Roggenkamp
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - D L Smith
- Department of Plant Pathology, University of Wisconsin-Madison, Madison, WI 53706, U.S.A
| | - D E P Telenko
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A
| | - C D Cruz
- Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907, U.S.A
| |
Collapse
|
7
|
Paul PA, Salgado JD, Bergstrom G, Bradley CA, Byamukama E, Byrne AM, Chapara V, Cummings JA, Chilvers MI, Dill-Macky R, Friskop A, Kleczewski N, Madden LV, Nagelkirk M, Stevens J, Smith M, Wegulo SN, Wise K, Yabwalo D. Integrated Effects of Genetic Resistance and Prothioconazole + Tebuconazole Application Timing on Fusarium Head Blight in Wheat. Plant Dis 2019; 103:223-237. [PMID: 30484755 DOI: 10.1094/pdis-04-18-0565-re] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Integrated Fusarium head blight (FHB) management programs consisting of different combinations of cultivar resistance class and an application of the fungicide prothioconazole + tebuconazole at or after 50% early anthesis were evaluated for efficacy against FHB incidence (INC; percentage of diseased spikes), index (IND; percentage of diseased spikelets per spike), Fusarium damaged kernel (FDK), deoxynivalenol (DON) toxin contamination, grain yield, and test weight (TW) in inoculated field trials conducted in 11 U.S. states in 2014 and 2015. Mean log response ratios and corresponding percent control values for INC, IND, FDK, and DON, and mean differences in yield and TW relative to a nontreated, inoculated susceptible check (S_CK), were estimated through network meta-analyses as measures of efficacy. Results from the analyses were then used to estimate the economic benefit of each management program for a range of grain prices and fungicide applications costs. Management programs consisting of a moderately resistant (MR) cultivar treated with the fungicide were the most efficacious, reducing INC by 60 to 69%, IND by 71 to 76%, FDK by 66 to 72%, and DON by 60 to 64% relative to S_CK, compared with 56 to 62% for INC, 68 to 72% for IND, 66 to 68% for FDK, and 58 to 61% for DON for programs with a moderately susceptible (MS) cultivar. The least efficacious programs were those with a fungicide application to a susceptible (S) cultivar, with less than a 45% reduction of INC, IND, FDK, or DON. All programs were more efficacious under conditions favorable for FHB compared with less favorable conditions, with applications made at 50% early anthesis being of comparable efficacy to those made 2 to 7 days later. Programs with an MS cultivar resulted in the highest mean yield increases relative to S_CK (541 to 753 kg/ha), followed by programs with an S cultivar (386 to 498 kg/ha) and programs with an MR cultivar (250 to 337 kg/ha). Integrated management programs with an MS or MR cultivar treated with the fungicide at or after 50% early anthesis were the most likely to result in a 50 or 75% control of IND, FDK, or DON in a future trial. At a fixed fungicide application cost, these programs were $4 to $319/MT more economically beneficial than corresponding fungicide-only programs, depending on the cultivar and grain price. These findings demonstrate the benefits of combining genetic resistance with a prothioconazole + tebuconazole treatment to manage FHB, even if that treatment is applied a few days after 50% early anthesis.
Collapse
Affiliation(s)
- P A Paul
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691
| | - J D Salgado
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691
| | - G Bergstrom
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - C A Bradley
- Department of Plant Pathology, University of Kentucky Research and Education Center, Princeton, KY 42445
| | - E Byamukama
- South Dakota State University, Department of Agronomy, Horticulture, and Plant Sciences, Brookings, SD 57007
| | - A M Byrne
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824
| | - V Chapara
- North Dakota State University, Langdon Research Extension Center, Langdon, ND 58249
| | - J A Cummings
- Plant Pathology and Plant-Microbe Biology Section, School of Integrative Plant Science, Cornell University, Ithaca, NY 14853
| | - M I Chilvers
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824
| | - R Dill-Macky
- Department of Plant Pathology, University of Minnesota, Saint Paul, MN 55108
| | - A Friskop
- North Dakota State University, Department of Plant Pathology, Fargo, ND 58102
| | - N Kleczewski
- Department of Plant and Soil Sciences, The University of Delaware, Newark, DE 19719
| | - L V Madden
- Department of Plant Pathology, The Ohio State University, Ohio Agricultural Research and Development Center, Wooster, OH 44691
| | - M Nagelkirk
- Michigan State University Extension, Sandusky, MI 48471
| | - J Stevens
- University of Nebraska-Lincoln, Department of Plant Pathology, NE 68538
| | - M Smith
- Department of Plant Pathology, University of Minnesota, Northwest Research and Outreach Center, Crookston, MN 56716
| | - S N Wegulo
- University of Nebraska-Lincoln, Department of Plant Pathology, NE 68538
| | - K Wise
- Department of Plant Pathology, University of Kentucky Research and Education Center, Princeton, KY 42445
| | - D Yabwalo
- South Dakota State University, Department of Agronomy, Horticulture, and Plant Science, Brookings, SD 57007
| |
Collapse
|
8
|
|