Associate Professor
nik.wiman [at] oregonstate.edu

Research Way Laboratory Building

Research Way Laboratory Building 1087

Research Way Laboratory Building 4575 SW Research Way

Research Way Laboratory Building

4575 SW Research Way

Corvallis, OR 97333

biological control
population biology
orchard ecology
insect behavior
integrated pest management

Nik earned a BS (biology) and MS (entomology) from Montana State University where he worked on biological control of weeds in rangeland. From there, he transitioning into tree fruit entomology, working for nearly a decade on mating disruption, biological control, and pest population dynamics in Wenatchee Washington, ultimately earning his PhD (entomology) from WSU in 2011. He Came to OSU as a postdoc (entomology/horticulture) in 2012.

At OSU

Headquarters:

Experiment Station

Career Links:

Department of Horticulture

Tree Fruits and Nuts

Brown Marmorated Stink Bug

Hazelnuts

Wiman Lab

Hazelnut Production Extension

Hazelnut Extension on Facebook

Information for hazelnut growers (listserv)

Cider Apple Extension on Facebook

Entomology Program

I accept graduate students for the Entomology Program

I accept graduate students for Horticulture

Student(s):

John Webber

Professional Accomplishments

Employment:

Associate Professor, Extension Orchard Specialist. Department of Horticulture, North Willamette Research and Extension Center. (2015-2021)
Assistant Professor, Extension Orchard Specialist. Department of Horticulture, North Willamette Research and Extension Center. (2015-2021)
Assistant Professor, Senior Research. Department of Horticulture, Oregon State University, Corvallis, OR. (2014-2015)
Postdoctoral Research Associate, Department of Horticulture/Crop and Soil Science, Oregon State University, Corvallis, OR. (2012-2014)
Associate in Research, Department of Entomology, Washington State University, Tree Fruit Research and Extension Center, Wenatchee, WA. (2002-2006).

Education:

Ph.D. - 2011 - Entomology, Washington State University, Pullman, WA

M.S. - 2001 - Montana State University, Bozeman, MT

B.S. - 1998 - Montana State University, Bozman, MT

My Awards

My Publications

Outreach and Extension

Extension Service Site Publications

(2023) Potential new aggressive EFB strain infecting resistant hazelnut varieties Eastern filbert blight is a fungal disease that has infected many hazelnut orchards in Oregon and Washington. Now some of the resistant varieties are showing signs of infection, notably aggressive cankers. Learn how to identify it, report it and manage it.
(2022) Measuring the Economic Impact of Pests and Pest Management on Oregon Hazelnuts Insects, diseases, weeds and other pests all affect Oregon's hazelnut industry. The report analyzes real-world data on these impacts to inform producers' approaches to integrated pest management.
(2019) Cultural control strategies to manage spotted-wing drosophila Cultural controls can reduce spotted-wing drosophila population pressure by modifying the microclimate within the crop so that the environment does not promote SWD reproduction and survival.
(2019) How seasons affect population structure, behavior and risk on spotted-wing drosophila Learn how temperature affects the life cycle of spotted-wing drosophila.
(2019) Hazelnut IPM Resources about integrated pest management for hazelnuts.
(2019) Wiman Lab Current research includes IPM for new and old hazelnut pests, hazelnut nutrition, hazelnut water use/irrigation, and cider apple production. Primary interests are population biology of insects, biological control, sustainable orcharding and grower outreach.
(2018) Brown Marmorated Stink Bug (BMSB) Information and resources about the brown marmorated stink bug (BMSB), an invasive
(2017) Trissolcus japonicus: Avispa parasitoide prometedora para el manejo de la chinche hedionda marrón marmoleada (CHMM) La avispa Trissolcus japonicus es una parasitoide que ataca a los huevos de la chinche hedionda marrón marmoleada (CHMM), una plaga de cultivos comerciales y huertos caseros. Por lo tanto, la Trissolcus japonicus tiene el potencial de manejar esta plaga. Esta publicación le ayudará a encontrar y reconocer la Trissolcus japonicus, y explica su modo de parasitismo. Esta publicación está disponible en inglés y español.
(2017) Samurai wasp: Promising egg parasitoid for management of Brown Marmorated Stink Bug (BMSB) The samurai wasp (Trissolcus japonicus) is a parasitoid that attacks the eggs of the brown marmorated stink bug (BMSB), making it a potential candidate for managing this significant threat to commercial agriculture and residential gardens. This publication will help you know what the samurai wasp looks like, where to find it, and how it parasitizes BMSB eggs. The publication is available both in English and Spanish.
(2020) El Chinche Apestoso Marrón Marmolado El chinche apestoso marrón marmolado (Halyomorpha halys) es un insecto invasor y una amenaza muy grave para la agricultura de Oregon. Se alimenta de más de 100 plantas incluyendo plantas agrícolas y ornamentales de importancia económica. Esta tarjeta presenta con fotos y descripciones para ayudar a identificar el chinche apestoso marrón marmolado y distinguirlos de otros insectos. La tarjeta también incluye fotos de los síntomas de daño en varias plantas.
(2013) Brown Marmorated Stink Bug The brown marmorated stink bug (Halyomorpha halys) is an invasive insect and a very serious threat to Oregon agriculture. It feeds on more than 100 plants, including economically important crops and ornamentals. This card has photos and descriptions to help identify brown marmorated stink bugs and distinguish them from other insects. The card also includes photos of damage symptoms on several plants.
(2023) 2023 Pest Management Guide for Peaches Get the latest recommendations for insect, mite and disease control in peach orchards of the Willamette Valley.
(2023) Hazelnut pest management guide for the Willamette Valley Learn how to control insects, weeds and disease during each stage of hazelnut growth.

View the app version
View diseases, pests and products by crop stage on a web-based app.
Try the app
(2022) 2022 Willamette Valley Pest Management Guide for Walnuts Read the latest recommendations for insect, mite and disease control in walnut orchards.
(2023) 2023 Willamette Valley Pest Management Guide for Cherries Get updated recommendations for insect, mite and disease control in cherry orchards of the Willamette Valley.
(2023) 2023 Pest Management Guide for Apples: Willamette Valley Learn the latest recommendations for insect, mite and disease control in Willamette Valley apple orchards.
(2024) 2024 Pest Management Guide for Tree Fruits: Hood River, The Dalles, White Salmon, Rogue Valley, Umatilla County This guide provides tree fruit growers with the latest information on pesticides and herbicides for fruit trees. People who grow apples, pears and cherries can learn application rates and recommendations for each stage of tree growth.
(2020) Managing diseases and insects in home orchards This pest management guide is for the home gardener. It recommends management practices for controlling diseases and insects in home orchards. It doesn't meet the exacting requirements of the commercial fruit grower.

My Media

My News Articles:

New Root Borer Pest Invades Oregon Hazelnut Orchards

Matthew Malcolm (Left) and Nik Wiman (right) standing in front of a PNP sign

Pacific Nut Producer Editor Matthew Malcolm met with Nik Wiman, Orchard Crops Extension Specialist at Oregon State University, to discuss the impact of the prionus californicus root borer and what growers can do about it.

Listen Here

New Root Borer Pest Invades Oregon Hazelnut Orchards

Full story

Homegrown mutant, not outside invader, causes new hazelnut blight

Farmer Bruce Chapin observes a sweeper prepare hazelnuts for harvest at his orchard near Salem, Ore. He expects a new homegrown mutant strain of Eastern Filbert Blight to slow rather than stop hazelnut planting, especially if prices continue improving.

The finding by Oregon State University scientists indicates the fungal pathogen has evolved locally, thwarting disease resistance from the Gasaway cultivar that’s been bred into newer hazelnut tree varieties.

Homegrown mutant, not outside invader, causes new hazelnut blight

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Reports of worrisome symptoms prompted OSU to conduct a test last year that has verified the strain affects otherwise resistant hazelnut cultivars, said Nik Wiman, an OSU Extension horticulture specialist.

Full story

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Hazelnut trees in Oregon's Willamette Valley are facing a new strain of Eastern Filbert Blight that can defeat resistance to the pathogen that's been bred into new cultivars. Ken & June’s Hazelnuts

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Brown Marmorated Stink Bugs endanger $132 million hazelnut crop

Nik Wiman, an associate professor in the Oregon State University College of Agricultural Sciences, stated that the first BMSB to be detected in Oregon was found in Portland in 2004. Wiman says OSU has been researching the bugs for a decade.

Full story

Large Increase of Brown Marmolated Stink Bugs Poses Serious Threat to Oregon Crops

Large Increase of Brown Marmolated Stink Bugs Poses Serious Threat to Oregon Crops

OSU research helps hazelnuts thrive

Recent breakthroughs by Oregon State University researchers against a devastating tree disease has helped the state’s hazelnut industry more than double its acreage in the last decade.

OSU research helps hazelnuts thrive

Hazelnut industry's partnership with OSU Foundation produces long-term benefits

Hazelnut Industry’s Partnership With OSU Foundation Produces Long-term Benefits

Oregon hazelnuts rebound after fierce ice storm

Oregon hazelnuts rebound after fierce ice storm

Extension’s experimental cider orchard to boost budding Oregon industry

OSU Extension's experimental apple cider orchard occupies three acres at the North Willamette Research and Extension Center in Aurora. Photo by: Nik Wiman

An experimental cider orchard planted in the rich farmland of the Willamette Valley could help lead Oregon’s fledgling hard cider industry into a profitable future.

Extension’s experimental cider orchard to boost budding Oregon industry

Researchers focus on helping hazelnut bloom

Hazelnuts are the most important orchard crop in Oregon’s Willamette Valley, where nearly the entire U.S. crop is produced. It is also known for the innovative cultivars developed at Oregon State ...

Researchers focus on helping hazelnut bloom

Primary tabs

Nik Wiman

Research Way Laboratory Building

Research Way Laboratory Building 4575 SW Research Way

Extension Service Site Publications

New Root Borer Pest Invades Oregon Hazelnut Orchards

New Root Borer Pest Invades Oregon Hazelnut Orchards

New Root Borer Pest Invades Oregon Hazelnut Orchards

New Root Borer Pest Invades Oregon Hazelnut Orchards

Homegrown mutant, not outside invader, causes new hazelnut blight

Homegrown mutant, not outside invader, causes new hazelnut blight

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Resurgent EFB pathogen overcomes Oregon hazelnut tree defenses

Brown Marmorated Stink Bugs endanger $132 million hazelnut crop

Brown Marmorated Stink Bugs endanger $132 million hazelnut crop

Large Increase of Brown Marmolated Stink Bugs Poses Serious Threat to Oregon Crops

Large Increase of Brown Marmolated Stink Bugs Poses Serious Threat to Oregon Crops

OSU research helps hazelnuts thrive

OSU research helps hazelnuts thrive

Hazelnut industry's partnership with OSU Foundation produces long-term benefits

Hazelnut industry's partnership with OSU Foundation produces long-term benefits

Oregon hazelnuts rebound after fierce ice storm

Oregon hazelnuts rebound after fierce ice storm

Extension’s experimental cider orchard to boost budding Oregon industry

Extension’s experimental cider orchard to boost budding Oregon industry

Researchers focus on helping hazelnut bloom

Researchers focus on helping hazelnut bloom

Student Resources

Employee Resources

New Employees