2025
seed weevil chart
Chart extract from J. Prasifka presentation


Below are links to the PowerPoint presentations (in PDF format) from the 47th NSA Research Forum held January 8-9, 2025. Click on the title of the presentation to access the file. Presentations are listed in the order in which they appeared in the program.

The content of these presentations may not be used without the consent of the author(s).
Update on Effects of Planting Date on Seed Weevil Damage and Other Yield Components file size: 5237 kb
Jarrad Prasifka, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Adam Varenhorst, SDSU, Department of Agronomy, Horticulture and Plant Science; Kristin Simons, NDSU, Carrington Research Ext. Ctr., Carrington, ND; Jeffrey Cluever, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Patrick Wagner, SDSU, West River Research and Extension, Rapid City, SD; Sam Ireland, SDSU, Dakota Lakes Research Farm, Pierre, SD

Red Sunflower Seed Weevil – Insecticide Testing file size: 4382 kb
Janet Knodel, Patrick Beauzay, NDSU, Department of Plant Pathology, Fargo, ND; Philip Rozeboom, Bradley McManus, SDSU, Brookings, SD; Patrick Wagner, SDSU, West River Research Extension, Rapid City, SD; Adam Varenhorst, SDSU, Brookings, SD

Spatial Patterns of Seed Weevil Damage in Grower Fields in Central South Dakota file size: 7198 kb
Jeffrey Cluever, Zachary Tarble, Jarrad Prasifka, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND

Effects of Ray Petals and Disc Color on Pollinator Visitation and Seed Damage file size: 11469 kb
Grace Hirzel, NDSU, Dept. of Biological Sciences, Fargo, ND; Jarrad Prasifka, Jeffrey Cluever, Zachary Tarble, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Kendra Greenlee, NDSU, Dept. of Biological Sciences, Fargo, ND

Investigating Mechanisms of Resistance to Sclerotinia and Phomopsis Diseases file size: 3012 kb
William Underwood, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Srushtideep Angidi, NDSU, Dept. of Plant Pathology, Fargo, ND; Israt Zaman, NDSU, Dept. of Plant Pathology, Fargo, ND; Lauren Carlson, Michael McWood, Samuel Henning, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND

Virulence Diversity of Plasmopara halstedii (Downy Mildew) in the Dakotas and Minnesota from 2019 to 2024 file size: 6429 kb
Jessica Scherer, Bryan Hansen, Gabe Dusek, Rick Hatchet, Gabe Lakoduk, Sam Markell, NDSU, Plant Pathology Dept. Fargo, ND

Response of Sunflowers to Phomopsis Culture Filtrates file size: 3127 kb
Karthika Mohan, NDSU, Dept. of Plant Pathology, Fargo, ND; William Underwood, Daniel Back, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Febina Mathew, NDSU, Dept. of Plant Pathology, Fargo, ND

Fungicides Against Phomopsis in Sunflowers file size: 2910 kb
Karthika Mohan, Sam Markell, Jessica Scherer, Bryan Hansen, Febina Mathew, NDSU, Dept. of Plant Pathology, Fargo, ND; Megan McCaghey, Peter Aspholm, U of MN, Dept. of Plant Pathology, St. Paul, MN; Peter Kovacs, Nicolas Passone, SDSU, Agronomy, Horticulture & Plant Science, Brookings, SD; Robert Harveson, Allison Rickey, UNL, Dept. of Plant Pathology, Panhandle Research and Ext. Ctr., Lincoln, NE

Advancing Sunflower Breeding in Argentina for Resistance to Sclerotinia sclertiorum and Diaporthe/Phomopsis file size: 3184 kb
Denis Colombo, NDSU, Dept. of Plant Pathology, Fargo, ND; Carla Filippi, Universidad de la República, Dept. de Biología Vegetal, Montevideo, Uruguay; Andres Corro Molas, INTA, Agencia De Extensión Rural General, Pico, Argentina; Matias Dominguez, INTA, Estación Experimental Agropecuaria, Pergamino, Argentina; Nicolas Heinz, INTA, Estación Experimental Agropecuaria, Manfredi, Argentina; Carolina Troglia, Carla Maringolo, Facundo Quiroz, INTA, Estación Experimental Agropecuaria, Balcarce, Argentina, Daniel Alvarez, INTA, Estación ExperImental Agropecuaria, Manfredi, Argentina; Veronica Lia, Norma Paniego, INTA-CONICET, Instituto de Agrobiotecnología y Biología Molecular, Hurlinghan, Argentina

Update on the Determination of Rust (Puccinia helianthi) Prevalence and Virulence in the Northern Great Plains file size: 8709 kb
Zachary Ittel, NDSU, Dept. of Plant Pathology, Fargo, ND; Brandt Berghuis, Dept. of Plant and Earth Science, U of Wisconsin-River Falls; Jessica Scherer, Kaylie Schlecht, NDSU, Dept. of Plant Pathology, Fargo, ND; Robert Harveson, UNL, Panhandle Research and Ext. Ctr., Scottsbluff, NE; Febina Mathew, NDSU, Dept. of Plant Pathology, Fargo, ND; Brent Hulke, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Bryan Hansen, Sam Markell, NDSU, Dept. of Plant Pathology, Fargo, ND

Managing Rhizopus Head Rot with Fungicides file size: 4428 kb
Robert Harveson, University of Nebraska- Lincoln, Panhandle REC, Scottsbluff, NE; Febina Mathew, Sam Markell, NDSU, Dept. of Plant Pathology, Fargo, ND

Genetic Control of Pericarp Strength and the Role of Genomic Structural Variants file size: 5792 kb
James McNellie, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Joseph White, U of CO, Ecology and Evolutionary Biology Dept., Boulder, CO; Brent Hulke, Jarrad Prasifka, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Brian Smart, NDSU, Dept. of Plant Sciences, Fargo, ND; Kyle Keepers, Nolan Kane, U of CO, Ecology and Evolutionary Biology Dept., Boulder, CO

Identifying a Core Set of Markers and Haplotype Structures to Track Segregation in Domesticated Sunflower file size: 2057 kb
Ashley Barstow, NDSU, Dept. of Plant Sciences, Fargo, ND; James McNellie, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Brian Smart, NDSU, Dept. of Plant Sciences, Fargo, ND; Kyle Keepers, U of CO, Ecology and Evolutionary Biology Dept., Boulder, CO; Jarrad Prasifka, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND; Nolan Kane, U of CO, Ecology and Evolutionary Biology Dept., Boulder, CO; Brent Hulke, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND

Effects of Drone Size and Speed of Approach on Territorial Red-winged Blackbird Antipredator Behavior file size: 1869 kb
Taylor Aliferis, , NDSU, Dept. of Biological Sciences, Fargo, ND; Page Klug, USDA-APHIS-WS NWRC, Dept. of Biological Sciences, Fargo, ND

Effects of Extended Drone Hazing and Raptor Interactions on Blackbird Behavior in North Dakota Sunflower Fields file size: 6229 kb
Jessica Kading, Timothy Greives, NDSU, Dept of Biological Sciences, Fargo, ND; Page Klug, USDA-APHIS-WS NWRC, Dept. of Biological Sciences, Fargo, ND

Precision, Quantitative Measurement of Sunflower Capitulum Inclination: A Trigonometry-Based Approach file size: 2820 kb
Emily DeValk, NDSU, Dept. of Plant Sciences, Fargo, ND; Brady Koehler, Brent Hulke, USDA-ARS, Sunflower Improvement Research Unit, Fargo, ND

Ornamental Sunflower for the Fresh Cut-Flower Market - Initial Results file size: 10797 kb
Calvin Trostle, Justus Janway, Jonathan Shockey, Texas A& M, AgriLife Ext., Lubbock, TX; Mason Marshall, Texas A&M, Horticulture Forest Science, College Station, TX; Jason Griffin, KSU, John C Pair Horticultural Ctr., Haysville, KS; Paul Winski, Texas A&M, AgriLife Ext.-Fort Bend City. College Station, TX; Tina Rosenbaum, Texas A&M, AgriLife Ext. Gilmer, TX

Spring Burndown Weed Control Options in Sunflower file size: 14462 kb
Brian Jenks, NDSU, North Central Research Ext. Ctr., Minot, ND

Early Spring Applications of Group 15 Herbicides (Long Chain Fatty Acid Inhibitors) and Group 14 Herbicides (PPO Inhibitors) for Control of Herbicide Resistant Weeds file size: 10088 kb
Jeanne Falk Jones, KSU, Northwest Research Ext. Ctr., Colby, KS; Ron Meyer, CSU, Burlington, CO

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