Agronomist

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Expertise: Field crops , Integrated pest management

Locations: Baker County , Union County , Wallowa County

Content
Publications
Awards

Content by Darrin Walenta

Kentucky bluegrass seed growers support research and Extension efforts

The Eastern Oregon Kentucky Bluegrass Workgroup has become a self-supporting organization and a vital partner with the Agricultural Research Foundation.

Darrin Walenta | May 2025 | Impact story

Oregon grass seed growers gain from OSU research and Extension

OSU conducts extensive research on various aspects of grass seed production thathelps growers improve yields and maintain the quality of their products.

Darrin Walenta, Christy Tanner, Shawn Donkin, Sam Angima | Feb 2025 | Impact story

Billbug Species Complex in Grass Seed Production Systems of Oregon: Characteristics, Impact and Management Options

Billbugs are pests you may see in turf grasses or in grass seed production. Learn the characteristics of billbug feeding damage, their impact on grass seed crops and effective management strategies.

Navneet Kaur, Nicole Anderson, Darrin Walenta, Brian Donovan, Alison Willette, John Spring, Claira Goracke, Jeremiah Dung | May 2024 | OSU Extension Catalog

Western yellow-striped armyworm: Biology and management basics

The western yellow-striped armyworm can damage forage and grass seed crops from late May to mid-September. Producers can take precautions to mitigate the impact of the pest.

Will Price, Darrin Walenta, Seth J. Dorman | Jan 2024 | OSU Extension Catalog

A PNW Extension Publication

Integrated Pest Management Guidelines and Biocontrol of Cereal Leaf Beetle in the Pacific Northwest

Darrin Walenta, Navneet Kaur, Nicole Anderson, Seth Dorman, Alison Willette, Claira Goracke, Sanford Eigenbrode and Brian Charlton

stippled blade of grass with small insect resembling mouse feces

PNW 777

For years, a small wasp has helped control the cereal leaf beetle, a pest of grass and grains. But now beetle numbers are climbing.

Cereal leaf beetle is an invasive insect pest of grass and cereal grains. For years, scientists have used a small parasitoid wasp to help control it. However, beetle populations are now climbing, and previously effective biological control regimes have been disrupted. Here are some integrated pest management options to reduce this pest's impact on cereal crops.

For years, a small wasp has helped control the cereal leaf beetle, a pest of grass and cereal grains. But now beetle numbers are climbing. Here are some options to reduce this pest's impact on crops.

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© 2024 Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the Oregon State University Extension Service, Washington State University Extension, University of Idaho Extension and the U.S. Department of Agriculture cooperating. The three participating Extension services offer educational programs, activities and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/ parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)

Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.

Oregon State University Extension Service

Increasing the reach of integrated pest management through community partnerships

Mary Halbleib, Cassie Bouska, Gordon B. Jones and Darrin Walenta

EM 9328

This publication summarizes the learner-centered education methods and community outcomes of three Extension partnerships. These projects increased the use of integrated pest management and pesticide risk reduction practices in Oregon. The insights gained from these partnerships are relevant to many subjects where educators are working with communities to make progress on shared goals.

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© 2021 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)

Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.

Measuring the Economic Impact of Pests and Pest Management on Oregon Peppermint

This summary demonstrates the yield and economic impacts of pests and pest management practices on the 2018 crop of Oregon peppermint. Researchers, Extension workers and crop consultants will benefit from this ...

Katie Murray, Isaac Sandlin, Paul Jepson, Darrin Walenta, Peter Ellsworth, Al Fournier, Hans Luh | Jun 2023 | OSU Extension Catalog

Integrated pest management strategic plan for Oregon, Washington and Idaho mint crops

Growers, researchers and industry experts created this IPM plan for PNW mint, outlining pest priorities and practices using the PAMS framework to improve sustainability and pest control strategies.

Katie Murray, Darrin Walenta, Paul Jepson, Isaac Sandlin | Nov 2024 | OSU Extension Catalog

Potato psyllid vector of zebra chip disease in the Pacific Northwest

Zebra chip disease is a potato infection emergent in the Pacific Northwest. Learn about the bacterium, the biology of the potato psyllid vector, the damage it causes and management techniques.

Silvia I. Rondon, Alan Schreiber, Phil Hamm, Nora Olsen, Erik Wenninger, Carrie Wohleb, Tim Waters, Rodney Cooper, Darrin Walenta, Stuart Reitz | Jun 2023 | OSU Extension Catalog

Oregon State University Extension Service

Irrigated Kentucky bluegrass (Eastern Oregon) nutrient management guide

Richard P. Affeldt, Darrin Walenta, John M. Hart, Donald A. Horneck and Gary Kiemnec

A field of Kentucky bluegrass with a snow-capped mountain in the background.

EM 9029

Gain insight into effective nutrient management for healthy, vigorous Kentucky bluegrass.

Ensure the health of your Kentucky bluegrass with this guide on essential soil nutrients. Understand the impact of soil nutrients on growth and the best practices for effective nutrient application.

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© 2011 Oregon State University. Extension work is a cooperative program of Oregon State University, the U.S. Department of Agriculture, and Oregon counties. Oregon State University Extension Service offers educational programs, activities, and materials without discrimination on the basis of race, color, national origin, religion, sex, gender identity (including gender expression), sexual orientation, disability, age, marital status, familial/parental status, income derived from a public assistance program, political beliefs, genetic information, veteran’s status, reprisal or retaliation for prior civil rights activity. (Not all prohibited bases apply to all programs.)

Accessibility: This publication will be made available in an accessible alternative format upon request. Please contact [email protected] or 541-737-3311.

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