2024-2025 Seminar Recordings
Click on the picture to access the seminar recordings
April 7, 2025

April 14, 2025

The effects of wildfire smoke exposure on beef cattle - Aline Santos, Animal Science Master's student - OSU
Bio: My name is Aline Santos, and I am a second-year master's student in Animal Science at Oregon State University. I am originally from Brazil more specifically I was born and raised in Campinas, which is a big city in São Paulo State. My research focuses on the effects of wildfire smoke exposure on beef cattle performance, behavior, and health and I am looking forward to sharing with you all!
April 21, 2025

High – Throughput Phenotyping of Early Generation Small Grains Breeding Lines to Indirectly Select for Grain Yield - Dalton Jones, Crop Science PhD student - OSU
Bio: Dalton Jones is a Ph.D. student in Crop Science working with Dr. Margaret Krause. Before coming to OSU, he completed an M.S. in Plant Science from Utah State University and a B.S. in Botany from Weber State University. In addition to schooling, he spent two years working as a research technician for the University of Montana, doing rangeland ecology monitoring across the Intermountain West. His research focuses on high-throughput phenotyping and genomic selection for early generation selection of yield and quality traits in wheat and barley.
April 28, 2025

The effect of Iris yellow spot virus on Onion thrips abundance, survival, and fecundity - Eileen Froshiesar, Crop Science Master's student - OSU
Bio: Eileen Froshiesar is a first year graduate student in the Crop Science program with a focus in Entomology. She earned her bachelor’s degree from Pacific University in Environmental Biology, and has been employed at the OSU Malheur Experiment Station for the past five years under Dr. Stuart Reitz in an entomology internship working with insects commonly found in onion, potato, and wheat production systems. For her master’s thesis research, she is evaluating the effects of an onion pathogen (Iris yellow spot virus) on the abundance, survival, and fecundity of an onion insect pest (onion thrips). The primary objectives of the research are to help growers better understand the relationship between Iris yellow spot virus and onion thrips, as well as to determine the effects of the virus on different onion thrips life stages and development.
May 5, 2025

Meet the new OSU Extension Organic Agriculture team
The Team: This new team of Extension Professors of Practice has six specialists including Shayan Ghajar (pasture and forages), Brigid Meints (grains and pulses), Shannon Cappellazzi (soil management), Lucas Nebert (seeds and planting stock), Todd Anderson (tree fruits and nuts) and Nick Andrews (vegetables). Cora Bobo-Shisler serves as their Outreach Coordinator. Beav.es/organic-ag
May 12, 2025

Soil Survey Field Operations and Activities in Oregon Localities Between 1975 and 2010 - Matthew Fillmore - Retired from USDA Soil Scientist
Bio: Matthew Fillmore attended Oregon State University (OSU) in Corvallis where he received B.S. degrees in Soil Science and Wildlife Science in 1976. He began his 37-year career with the USDA Soil Conservation Service in Oregon as a Soil Scientist in 1977 working in Linn County. In 1983 he was transferred to Baker County in northeastern Oregon. In 1987 he was promoted to Soil Survey Project Leader for the Curry County survey project in southwestern Oregon. In 1994 he moved back to Corvallis and was stationed in the Soil Science Department at OSU to begin the initial MLRA-based update for Oregon in Benton County. In 2008 he became the original MLRA Soils Office Leader for all of western Oregon based in Salem. He mapped over 1 million acres throughout Oregon and authored three soil survey manuscripts (Curry, Benton and Tillamook counties) during his career. He is one of the co-authors of the recently published book “The Soils of Oregon”. He retired from government service in 2013 and lives in Lebanon, Oregon.
June 2, 2025

Examples of DEI efforts in CSS Research, Teaching, and Extension - Department of Crop and Soil Science DEI Committee
The DEI committee is pleased to host a seminar featuring several members of the CSS department. Each presenter will give a 3-minute flash talk about a way they have incorporated DEI efforts into their research, teaching, or Extension work. After the flash talks, we will open the room (zoom and in-person) for discussion about how all faculty, staff, and students can incorporate DEI efforts in their own work. We encourage people to come with their own examples or ideas to share. The goals of the seminar are to give members of the department ideas for how they might incorporate DEI into their own work and to begin drafting a CSS-specific document similar to the attached University-wide DEI guide that can serve as a long-term resource for our department.
January 13, 2025

Science communication, click bait or clandestine advertisement? - the challenge of getting complicated science across to the public
In October 2024, the New York Times published a feature with the title
“Changing the DNA of Living Things to Fight Climate Change”
Article link and accompanying video
In this article, the connections between nitrogen fertilization, seed technology, release of genetically modified microorganisms into the environment, and climate change are interlaced by references to jealous industrial moguls trying to suppress innovative science. The reader is sent off by quoting a scientist as saying: “Basically you have to pick here, greenhouse gas emissions or the use of a genetically modified organism".
But is this really so? In a nutshell, emerging technologies propose the use of genetically altered free living nitrogen fixing bacteria to partially meet crop nitrogen needs. There are many pro's and con's to be considered in any application of new technology, and that is definitely the case here.
On implementing new technology, one major consideration will always have to be: are the risks worth the benefits ? To give the public a chance to understand the issue and, ideally, participate in the necessary discussion and eventual decisions, it must be well informed. Many of us rely on "quality" media for the process of making science understandable for the general public. As we all know, that is not an easy task.
As members of CSS, we felt particularly touched by the topic, and spontaneously decided to go beyond the sensational title and apply a bit of scrutiny to the story and educate ourselves on the proposed technology. We plan to do this as follows:
At the January 13 Seminar, a brief presentation will provide needed context, recapitulating the scientific basics of
(i) Nitrogen fixation in general
(ii) Environmental effects of mineral fertilizers
(iii) Quantitative role of biological nitrogen fixation in plant nutrition
This event is meant to establish the factual basis behind the major assertions put forward in the article and give us all better context to dig into the pros and cons of the proposed technology.
January 27, 2025

Science communication, click bait or clandestine advertisement? - the challenge of getting complicated science across to the public
In October 2024, the New York Times published a feature with the title
“Changing the DNA of Living Things to Fight Climate Change”
Article link and accompanying video
In this article, the connections between nitrogen fertilization, seed technology, release of genetically modified microorganisms into the environment, and climate change are interlaced by references to jealous industrial moguls trying to suppress innovative science. The reader is sent off by quoting a scientist as saying: “Basically you have to pick here, greenhouse gas emissions or the use of a genetically modified organism".
But is this really so? In a nutshell, emerging technologies propose the use of genetically altered free living nitrogen fixing bacteria to partially meet crop nitrogen needs. There are many pro's and con's to be considered in any application of new technology, and that is definitely the case here.
On implementing new technology, one major consideration will always have to be: are the risks worth the benefits ? To give the public a chance to understand the issue and, ideally, participate in the necessary discussion and eventual decisions, it must be well informed. Many of us rely on "quality" media for the process of making science understandable for the general public. As we all know, that is not an easy task.
As members of CSS, we felt particularly touched by the topic, and spontaneously decided to go beyond the sensational title and apply a bit of scrutiny to the story and educate ourselves on the proposed technology. We plan to do this as follows:
On January 27, we intend to follow up with a town hall type discussion with a moderated Q and A format. The moderators will be Dr. Elizabeth Verhoeven and Dr. Markus Kleber. As panelists we have invited
(i) Dr. Ryan Mueller, Associate Professor of Microbiology, Department of Microbiology, OSU, to respond to questions regarding risk analysis for the release of genetically modified microorganisms into the environment
(ii) Dr. Yanni Ma, Associate Professor of Organizational and Environmental Communication, School of Communication, OSU, to help us understand the motives and possibly pressures acting on the author of this feature and insights on the difficulties of science communication in general
February 3, 2025

Waterhemp in Wisconsin Corn-Soybean Production Systems: Addressing a Critical Challenge with Cover Crops and See & Spray Technology - Dr. Rodrigo Werle, Associate Professor and Extension Cropping Systems Weed Scientist - University of Wisconsin-Madison
Bio: Dr. Rodrigo Werle is an Associate Professor and Extension Cropping Systems Weed Scientist at the University of Wisconsin-Madison, where he leads the WiscWeeds Research and Extension program. His program focuses on developing integrated weed management strategies for corn and soybean in Wisconsin’s agricultural systems. Originally from a small farming community of Dutch immigrants in southeastern Brazil, Dr. Werle’s early passion for agriculture inspired him to pursue undergraduate studies in Agronomy at São Paulo State University. He went on to earn both his MS and Ph.D. in Weed Science from the University of Nebraska-Lincoln.
February 10, 2025

Contiguous draft genome of powdery scab pathogen Spongospora subterranea - Shengwei Hu, Crop Science PhD student - OSU
Bio:
I am a current PhD student in the Department of Crop and Soil Science. My research focuses on improving soil health by advancing our understanding of CRKN biology, developing diagnostic markers to differentiate between races of the pathogen, and generating enhanced potato germplasm resistant to CRKN.
February 24, 2025

Urban Soil Health and Management- Marissa Theve, Soil Scientist, USDA-NRCS
Bio: Marissa hales from rural Eastern Connecticut where she grew up playing in the woods and brook near her home. She earned a bachelor of science in environmental science and management from the University of Rhode Island, followed by a master’s of science in natural resources and the environment from the University of Connecticut. In grad school Marissa was hired full-time by the USDA-NRCS soil survey office in Tolland, CT, where she spent 6 years studying tidal marshes, helping finish urban mapping in New York City, and working on several subaqueous soil projects. Marissa moved to Salem, OR in 2016 to accept a position at the Bureau of Land Management where she worked for over 6 years helping decision makers make informed choices about timber sales, recreation activities, and restoration projects. Since 2023, Marissa has rejoined the USDA-NRCS as a resource soil scientist covering the wetland and highly erodible land program as well as the soil science outreach needs of the nine northwest counties of Oregon.
March 3, 2025

Over Coming the Barriers to Cover Crop use in Hazelnut Orchards - Chris Lessey, Soil Science MS student, OSU
Bio: My name is Chris Lessey and I am a second year master's student working on studying soil health in hazelnut orchards in the Willamette Valley. My project focuses on studying orchards with cover crops and comparing them to orchards with bare soil. We are studying microbial respiration, aggregate stability, carbon to nitrogen ratio, pH, EC, nut quality, pest pressure, soil temperature, soil moisture, water infiltration, and more! The goal of the project is to study orchards that are having success with cover crops to build a roadmap for other farmers to follow. We are focused on the soil and the effects cover crops have on the orchard.
October 7, 2024

Characterization of Russet Potato Microbiomes - Holly Golightly, Crop Science MS student - OSU
Bio: Holly is an MS student in the OSU Crop Science program, with a focus in plant breeding and genetics. She completed her undergraduate studies at OSU in crop and soil science and sustainability. Her thesis project centers around how potato plant genetics and the potato microbiome can influence resistance to corky ringspot disease, which is caused by tobacco rattle virus (TRV) vectored by stubby root nematodes (SRNs).
October 14, 2024

Soil carbon assessment in agroecosystems - Dr. Alfred Hartemink, Professor of Soil Science - University of Wisconsin-Madison
Bio: Dr. Alfred Hartemink is Professor of Soil Science at the University of Wisconsin – Madison. He has a MS and PhD degree in soil fertility and pedology from Wageningen University in the Netherlands and Reading University in the UK. At UW Madison, he teaches Pedology and Introduction Soil Science. His research focusses on digital soil morphometrics, soil mapping, and soil carbon in relation to real-world problems. He has developed the digital soil morphometrics discipline which transforms the way soil profiles are being studied and sampled. Prior to his current position, he was 12 years senior researcher at ISRIC–World Soil Information in the Netherlands, and coordinator of the GlobalSoilMap project. He has worked for 12 years as soil fertility expert and soil surveyor in Tanzania, DR Congo, Indonesia, Kenya, Australia and Papua New Guinea, and for shorter periods in several other countries. Alfred is SSSA Fellow, recipient of the SSSA Presidential Award, and an Honorary Member of the International Union of Soil Science (IUSS) and Dutch Society of Soil Science (NBV).
October 21, 2024

Advancing Infrastructure Resilience through Geochemical Simulations of Stabilized Soils - Dr. Pavan Akula, Assistant Professor, Civil and Construction Engineering - OSU
Bio: Dr. Pavan Akula is an Assistant Professor at Oregon State University, USA. His research focuses on developing advanced computational and experimental techniques for evaluating infrastructure materials. He received his Ph.D. in Civil Engineering from Texas A&M University in May 2020 and his Master’s in Civil Engineering from the National University of Singapore in December 2012. Prior to his Ph.D., he worked as a Geotechnical Engineer for AECOM. He is the committee communication coordinator and an active member of the Stabilization of Geomaterials and Recycled Materials at Transportation Research Board.
October 28, 2024

Establishing Strategic Weed Research and Educational Programs at Oregon State University - Dr. Victor Ribeiro, Assistant Professor and Extension Weed Specialist - OSU
Bio: Victor Ribeiro is an Assistant Professor and Extension Weed Specialist in the Department of Crop and Soil Science at Oregon State University. He earned his PhD in Crop Science from Oregon State University and gained experience as a research scholar in Weed Science at the University of Wisconsin-Madison prior to his doctoral studies. Victor's research interests include herbicide resistance in weeds, herbicide fate in the environment and non-target impacts, weed biology and ecology, and integrated weed management.
November 4, 2024

Redox Heterogeneity and Carbon Chemistry in Rhizosphere Soil - Dr. Jared Wilmoth, Assistant Professor - University of Maryland
Bio: Dr. Jared Wilmoth is an assistant professor at the University of Maryland, College Park, in the dept of Environmental Science and Technology (ENST). He broadly studies soil chemistry, including biogeochemistry and redox processes in soils, with emphasis on agricultural and wetland soils. Dr. Wilmoth leads the Soil Chemical Interfaces group in ENST. A current focus of the lab group is on redox dynamics and C transformations in soils under climate change in the US Mid-Atlantic. Before starting at UMD in 2020, Dr. Wilmoth worked as a postdoctoral soil scientist at Princeton University with the Carbon Mitigation Initiative and before that at Oak Ridge National Lab working on soil biogeochemistry and microfluidics. He received his PhD from the University of Georgia, Athens, in 2016.
November 18, 2024

Evolution of a food systems center: From Small Farms to Regional Vitality - Dr. Lauren Gwin, Director - Center for Small Farms and Community Food Systems, Oregon State University
Bio: Dr. Gwin directs the Center for Small Farms & Community Food Systems, is the Extension Community Food Systems Specialist, and is an associate professor in the Crop & Soil Science Department. She provides leadership for a mosaic of programs and partnerships focused on sustainable and organic agricultural practices, and local and regional food systems. She also engages on these issues nationally: her extension and scholarship have shaped state and federal policy and practice, which has benefited many businesses and nonprofit organizations. Her PhD is in Environmental Science, Policy, and Management, from the University of California at Berkeley. Lauren gave her first CSS seminar almost exactly ten years ago, when she joined the department
November 25, 2024
Podophyllotoxin in Juniperus and Related Species - Alhanouf Alzahrani - Crop Science MS student - Oregon State University
Bio: I am Alhanouf Alzahrani, a Master's student in Crop Science with a Bachelor's degree in Biology from the University of Jeddah, Saudi Arabia. My research focuses on bioprospecting chemicals for drug development, specifically podophyllotoxin in Juniperus species. Podophyllotoxin, found in some Juniperus species, is a bioactive compound with significant pharmaceutical potential. It's known for its anticancer properties. My research into podophyllotoxin in Juniper species is exciting because it could provide a more sustainable source for drug development.
December 2, 2024

Exploring biochar opportunities to promote circular economy - Dr. Islam Hafez, Assistant Professor, Wood Science - Oregon State University
Bio: Islam Hafez is an assistant professor at the Department of Wood Science and Engineering at Oregon State University. He received his PhD in Bioproducts Engineering from the University of Minnesota. He was a postdoctoral researcher and research assistant professor at the School of Forest Resources at the University of Maine. The broad context of his work looks at the structure-process-property relationships of bio-based composites and adhesives. He is particularly interested in the design and manufacturing of composites and the scale-up of promising products and technologies.