Oregon State University scientists Jeness Scott and Jeremiah Dung at the OSU Central Oregon Agricultural Research and Extension Center in Madras launched a yearlong study in two commercial carrot seed fields in Central Oregon. They...
Publications Database
Annual Reports
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Tiny crop, mighty impact: Central Oregon carrot seed helps feed the world
Carrots have a low threshold for cross pollination, and in Central Oregon, there are nearly no wild carrots to taint a crop. Jeremiah Dung, an OSU associate professor at the Central Oregon Agricultural Research and Extension Center,...
New OSU study shows persistent airborne spread of carrot disease
In the high desert of Central Oregon, farmers produce some of the world’s most valuable hybrid carrot seed. But their fields face a persistent and costly threat: a plant disease called bacterial blight, caused by the bacterium ...
OSU partnership provides durability for Central Oregon hay growers
Hay and forage producers in Central Oregon, Oregon’s top hay-producing region, face significant challenges, including limited irrigation water supply, increasing fertilizer and input costs and changing insect pest dynamics. Overcoming...
Dr. Steve Culman named Director of Central Oregon Agricultural Research and Extension Center
Following a national search, Dr. Steve Culman has been named the new Director of the Central Oregon Agricultural Research and Extension Center, effective October 1.
Dr. Culman brings a wealth of experience and expertise in...
Water shortages loom large at Jefferson County Farm Fair
The Central Oregon Farm Fair & Trade Show. The fair, held at the Jefferson County Fairgrounds Wednesday and Thursday, is an annual gathering of farmers, ranchers, equipment dealers, agronomists and others in this area’s...
Altitude adds energy value to alfalfa hay
The list of components in a dairy cow’s ration includes forages, nonfiber carbohydrate feeds (grains and by-products), rumen degradable and by-pass proteins, fat, minerals, vitamins, and other feed additives.
Characterizing the Incidence and Distribution of Bacterial Blight Infestation in Individual Carrot Seeds: Can One Bad Seed Spoil the Whole Seed Lot?
Series/Report Number: COARC2016
Abstract: Bulk samples of carrot seed are tested for Xanthomonas hortorum pv. carotae (Xhc) using a seed wash dilution-plating protocol (Asma, 2005). In this...
Electronic Mint Pest Alert Newsletter Regarding Control of Mint Root Borer, Cutworm Complex and Loopers (Year 3)
Series/Report Number: COARC2016
Chapter Number: 44
Abstract: An electronic newsletter was developed for the peppermint production regions in Oregon to assist growers...
Evaluation of Disinfectant Seed Treatments to Reduce Xanthomonas hortorum pv. carotae in Carrot Seed Lots
Bacterial blight of carrot, caused by the plant pathogenic bacterium Xanthomonas hortorum pv. carotae (Xhc), is a common disease of carrot wherever the crop is grown. The disease can affect carrot foliage, stems, umbels, and roots and...
Evaluation of Ergot Resistance and Disease Escape in Kentucky Bluegrass Cultivars
Series/Report Number: COARC2016
Abstract: Ergot is an important disease of Kentucky bluegrass seed production in Oregon. The disease is caused by the fungal pathogen Claviceps purpurea,...
Evaluation of Herbicides for Control of Rough Bluegrass, Cheatgrass, Rattail Fescue and Medusahead in Establishment Year and Second Year Kentucky Bluegrass Grown for Seed
Series/Report Number: COARC2016
Abstract: Adequate weed control during the establishment year of Kentucky bluegrass seed production is a challenge, particularly for grassy weeds in a grass...
Evaluation of ManKocide Alternatives for Bacterial Blight Control in Steckling-to-Seed Carrot Seed Crops
Series/Report Number: COARC2016
Abstract: Management of bacterial blight in carrot seed crops can be difficult and begins with the planting of healthy or treated seed. However, planting...
Evaluation of Potential New Herbicides in Carrots Applied as a Directed Spray at Layby
Series/Report Number: COARC2016
Abstract: Weed resistance to ongoing use of Lorox in carrots grown for seed is a concern to industry representatives and growers. This project was established...
Evaluation of Potential New Insecticide in Carrots for Lygus Control
Series/Report Number: COARC2016
Abstract: Lygus bugs feeding on carrots grown for seed during flowering and seed maturation reduce seed viability. Potential new insecticides for control of...
Evaluation of Potential New Insecticides and Fungicides for Honey Bee Repellency in Seed Carrots
Series/Report Number: COARC2016
Abstract: To insure honey bee safety during crop pollination, potential new products were screened for bee repellency. This research was conducted in a carrot...
Foliar Boron Fertilizer Application and Timing in Hybrid Carrot Seed Production
Hybrid European Nantes carrot seed production can be challenging for growers as yields can be unreliable. Demand for boron (B) in many crops is greatly elevated during flowering and seed set even when B in the plant leaves are in the...
Management of Verticillium Wilt Using Green Manure Biofumigants
Series/Report Number: COARC2016
Abstract: Verticillium wilt caused by the fungus Verticillium dahliae is the most important disease of commercial mint production. Rotation to non-hosts is...
Pilot Balloon Observations, 2016, Jefferson County Smoke Management
Series/Report Number: COARC2016
Abstract: Pilot Balloon (PIBAL) observations are a major component of the daily decision-making process used in managing open field burning of grass seed and...
Prevalence of Race 2 Strains of Verticillium dahliae Causing Verticillium Wilt of Mint in Oregon
Series/Report Number: COARC2016
Abstract: Verticillium dahliae is a plant pathogenic fungus that causes Verticillium wilt, which is the most detrimental disease of commercially grown...
2015 COARC Annual Report
The Central Oregon Agricultural Research Center (COARC) faculty and staff are pleased to present this summary of 2015 research activities for your review. The reports included in this publication focus on grass seed, vegetable seed,...
Central Oregon Potato Extension Program, 2015
Series/Report Number: COARC2015
Abstract: Aphids, tuberworm moths, potato psyllids, and beet leafhoppers were collected and counted weekly in Jefferson County from June 23 to September 9,...
COARC Research Garden & Learning Center and Agricultural Education Outreach, 2015
Series/Report Number: COARC2015
Abstract: The Central Oregon Agricultural Research and Learning Center is an ongoing project in its 9th year of activity. The garden provides a hands-on...
Discrimination of Mint Strains of Verticillium dahliae Using High Resolution Melting Analysis
Series/Report Number: COARC2015
Electronic Mint Pest Alert Newsletter to Promote Optimal Application of Coragen® to Control Mint Root Borer, Cutworms, Armyworms and Loopers, 2015
Series/Report Number: COARC2015
Abstract: An electronic newsletter was developed for the peppermint production regions in Oregon to assist growers and fieldmen consider control of mint root...
Publications
2026
Journal Article
“Bee Communities And Patterns In Flower Visitation In Crested Wheatgrass Seedings In Eastern Oregon Sagebrush Steppe”. Rangeland Ecology & Management 106 (2026): 64 - 69. Web. Rangeland Ecology & Management.
“Bee Communities And Patterns In Flower Visitation In Crested Wheatgrass Seedings In Eastern Oregon Sagebrush Steppe”. Rangeland Ecology & Management 106 (2026): 64 - 69. Web. Rangeland Ecology & Management.
“A Matter Of Timing: Sagebrush Steppe Restoration Seeding Outcomes Altered By Species Responses To Warmer Spring Temperatures And Interannual Weather Variation”. Restoration Ecology (2026): n. pag. Web. Restoration Ecology.
“Cutting, Herbicide, And Fire: A Case Study For Managing Woody Plants In Tallgrass Prairies”. Restoration Ecology (2026): n. pag. Web. Restoration Ecology.
“Extensive Use Of Agricultural And Conservation Fields By Male Greater Sage-Grouse In Washington State”. Rangeland Ecology & Management 106 (2026): 70 - 77. Web. Rangeland Ecology & Management.
. “Timing Of Seeding After Indaziflam Control Of Annual Grasses To Limit Nontarget Damage”. Rangeland Ecology & Management 106 (2026): 78 - 82. Web. Rangeland Ecology & Management.
. “Direct And Indirect Effects Of Floral Defoliation On Photochemical And Non‐Photochemical Chlorophyll Fluorescence Dynamics Of A Semiarid Bunchgrass”. Plant-Environment Interactions 7.1 (2026): n. pag. Web. Plant-Environment Interactions.
“Invasive Annual Grass Relationships To Environment And Grazing Vary With Species Identity”. Biological Invasions 28.1 (2026): n. pag. Web. Biological Invasions.
. “Influence Of Shrub‐Induced Microhabitats And Biocrusts On Native Bunchgrass Seedling Establishment And Growth”. Restoration Ecology 34.1 (2026): n. pag. Web. Restoration Ecology.
Report
Oregon Beef Council Report 2026 Edition. Oregon State University, 2026. Print.
2025
Conference Proceedings
“Wyoming Sagebrush Rangeland Soils Are A Weak Methane Sink”. 12th International Rangeland Congress 2025: n. pag. Print. 12Th International Rangeland Congress .
Extension Publication
Journal Article
. “A Potential Solution To The Challenge Of Controlling Invasive Annual Grasses While Maintaining A Sagebrush Overstory”. Rangeland Ecology & Management 99 (2025): 58 - 65. Web. Rangeland Ecology & Management.
. “Herbivory Can Reduce Perennial Grass Seedling Survival, But Temperature And Cumulative Precipitation Are More Important Predictors In The First Growing Season”. Restoration Ecology 33.2 (2025): n. pag. Web. Restoration Ecology.
“Estimation Of Leaf Area Index In Sagebrush Steppe With Low Cost Unoccupied Aerial Systems”. Landscape Ecology 40.2 (2025): n. pag. Web. Landscape Ecology.
“Climate Change Vulnerabilities And Adaptation Strategies For Land Managers On Northwest Us Rangelands”. Rangeland Ecology & Management 98 (2025): 399 - 413. Web. Rangeland Ecology & Management.
“Plant Production Forecasts Across Geographical Sites And Ecological States In Sagebrush-Steppe Plant Communities”. Rangeland Ecology & Management 98 (2025): 609 - 619. Web. Rangeland Ecology & Management.
“Postfire Seeding Of Native Compared With Introduced Bunchgrasses Followed 3 Yr Later With Invasive Annual Grass Control”. Rangeland Ecology & Management 98 (2025): 146 - 154. Web. Rangeland Ecology & Management.
. “Spread Of Forage Kochia In Invasive Annual Grass-Dominated Sagebrush Steppe”. Rangeland Ecology & Management 101 (2025): 89 - 92. Web. Rangeland Ecology & Management.
. “Nest Predators Of Sagebrush‐Obligate Songbirds In The Northern Great Basin”. Wildlife Society Bulletin 49.2 (2025): n. pag. Web. Wildlife Society Bulletin.
“Does Applying Indaziflam And Imazapic Together Improve Restoration Of Annual Grass-Invaded Rangelands?”. Rangeland Ecology & Management 102 (2025): 88-95. Print. Rangeland Ecology & Management.
“Effects Of Cattle Grazing On Food Web Dynamics: Meso-Predators And Rodents In A Sagebrush Ecosystem”. Rangeland Ecology & Management 102 (2025): 172 - 185. Web. Rangeland Ecology & Management.
“Local Adaptation To Climate Has Facilitated The Global Invasion Of Cheatgrass”. Nature Communications 16.1 (2025): n. pag. Web. Nature Communications.
“Phenological Sensitivity Of Bromus Tectorum Genotypes Depends On Current And Source Environments”. Ecology 106.3 (2025): n. pag. Web. Ecology.
. “Seed And Seedling Traits Suggest Ontogenetic Coordination In The Functional Recruitment Niche For Dryland Restoration Speciesabstract”. Journal of Ecology 113.5 (2025): 1103 - 1120. Web. Journal Of Ecology.
“Environmental Characteristics Linked To Successful Introductions Of A Rare Wetland Grass (Pleuropogon Oregonus)”. Natural Areas Journal 45.4 (2025): 269-278. Web. Natural Areas Journal.
“Experimental And Experiential Recommendations For Using The Greenfeed Systems To Measure Gas Flux In Grazing And Confined Cattle”. MethodsX 15 (2025): n. pag. Web. Methodsx.
“Effects Of Long-Term Grazing At Different Intensities On Herbaceous Biomass In Southeast Oregon Sagebrush Steppe”. Rangeland Ecology & Management 103 (2025): 307 - 317. Web. Rangeland Ecology & Management.
“Initial Divergent Postfire Recovery Converges Over The Long-Term: A Case Study In Juniper-Encroached Sagebrush Steppe”. Rangeland Ecology & Management 103 (2025): 377 - 387. Web. Rangeland Ecology & Management.
. “Soil Texture Is Associated With Wide Variation In Forb Communities In Established Nonnative Perennial Grass Seedings”. Western North American Naturalist 85.3 (2025): 456-475. Print. Western North American Naturalist.
. “The Structural Organization Of A Moth Community (Lepidoptera) In Semi-Arid Rangelands Of Central Oregon With Respect To Fire Disturbance And Yearly Weather Variation”. The Journal of the Lepidopterists' Society 79.4 (2025): n. pag. Web. The Journal Of The Lepidopterists' Society.
“Interannual Variation In Provenance Performance Under Drought In A Great Basin Rangeland”. Restoration Ecology 33.2 (2025): n. pag. Web. Restoration Ecology.
Outreach
. “Great Basin Wildflowers Kid’s Coloring Pages”. 2025: n. pag. Print.
. “Iyrp North America Kid’s Coloring Pages”. 2025: n. pag. Print.
2024
Journal Article
“Weather Effects On Herbaceous Yields: Wyoming Big Sagebrush Steppe, Southeastern Oregon”. Western North American Naturalist 84.1 (2024): 89-106. Web. Western North American Naturalist.
. “Dryland Restoration Needs Suggest A Role For Introduced Plants”. Global Ecology and Conservation 53 (2024): e03005. Web. Global Ecology And Conservation.
“Ecological Benefits Of Strategically Applied Livestock Grazing In Sagebrush Communities”. Ecosphere 15.5 (2024): n. pag. Web. Ecosphere.
“Evaluating Performance Of Three Types Of Carbon Seed Coatings On Seedling Development”. Restoration Ecology (2024): n. pag. Web. Restoration Ecology.
“Evaluating Different Rates Of Activated Carbon In Commercially Produced Seed Coatings In Laboratory And Field Trials”. Restoration Ecology (2024): n. pag. Web. Restoration Ecology.
. “A Brief History Of Sagebrush Management In The Great Basin: From Removal To Reduction And Beyond”. Rangelands 46.3 (2024): 63 - 71. Web. Rangelands.
“Repeated Clearing As A Mechanism For Savanna Recovery Following Bush Encroachment”. Journal of Applied Ecology (2024): n. pag. Web. Journal Of Applied Ecology.
“Repeated Clearing As A Mechanism For Savanna Recovery Following Bush Encroachment”. Journal of Applied Ecology (2024): n. pag. Web. Journal Of Applied Ecology.
“Cross‐Scale Analysis Reveals Interacting Predictors Of Annual And Perennial Cover In Northern Great Basin Rangelands”. Ecological Applications (2024): n. pag. Web. Ecological Applications.
. “Sagebrush Ecosystems Are More Than Artemisia: The Complex Issue Of Degraded Understories In The Great Basin”. Rangeland Ecology & Management 94 (2024): 184 - 194. Web. Rangeland Ecology & Management.
“Extreme Drought Impacts Have Been Underestimated In Grasslands And Shrublands Globally”. Proceedings of the National Academy of Sciences 121.4 (2024): n. pag. Web. Proceedings Of The National Academy Of Sciences.
“Spring-Applied Treatments Offer Another Window Of Opportunity For Revegetation Of Annual Grass−Invaded Rangelands”. Rangeland Ecology & Management 93 (2024): 104 - 111. Web. Rangeland Ecology & Management.
“Demography With Drones: Detecting Growth And Survival Of Shrubs With Unoccupied Aerial Systems”. Restoration Ecology (2024): n. pag. Web. Restoration Ecology.
“Effects Of Electrolyte Supplementation On Performance And Physiological Responses Of Preconditioning Beef Calves”. Translational Animal Science 8 (2024): n. pag. Web. Translational Animal Science.
“Drought Response In Herbaceous Plants: A Test Of The Integrated Framework Of Plant Form And Function”. Functional Ecology (2024): n. pag. Web. Functional Ecology.