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Monday 9am - 4:30pm Tuesday 9am - 4:30pm Wednesday 9am - 4:30pm Thursday 9am - 4:30pm Friday 9am - 4:30pm

OSU Hazelnut Extension

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Aurora, OR
OSU Hazelnut Extension

Hazelnut production in the Willamette Valley of Oregon and beyond. Hazelnut outreach for western Oregon and beyond.

We are based at the North Willamette Research and Extension center, near Aurora OR.

07/16/2026

A new to us spider mite in hazelnuts, let us know if you see it in your orchard!

spider mites can be a pest in hazelnuts and there is a new species. Continue reading →

05/01/2026

Seeing leafrollers in the hazelnut orchard? Expect insect pressure this year, winter was too mild. I like to think this pest inspired the break dance move "The Worm".

Leafrollers in the hazelnut orchard. Leafrollers are a pest we usually don’t worry too much about, they are not a direct pest that attack the nuts (generally) and in that regard they are not as important as other pests like … Continue reading →

11/17/2025

https://blogs.oregonstate.edu/hazelnuts/pest-alert-japanese-beetle-in-hazelnuts/

The Japanese beetle Popillia japonica (Newman) is a scarab beetle (Coleoptera: Scarabaeidae) from Japan that has become an invasive pest in the US where it was first introduced in 1916. This insect, although very beautiful, is a major threat to … Continue reading →

06/11/2024

https://blogs.oregonstate.edu/hazelnuts/waking-up-tired/

Hazelnut growers across the Willamette Valley have been seeing a trend with trees that are slow to develop their canopies this spring and there is an abundance of dead, twiggy wood and buds that failed to develop normally. Overall, this … Continue reading →

06/05/2023

https://blogs.oregonstate.edu/hazelnuts/pest-alert-california-root-borer-in-hazelnuts/

A few years back we were trying to attract flatheaded borers (Buprestidae) to traps when we realized another borer pest may also be problematic in hazelnuts. Working with a pheromone company (AlphaScents, Canby OR) we deployed some pheromone of the … Continue reading →

05/11/2023

https://blogs.oregonstate.edu/hazelnuts/heat-and-sulfur-burn-in-hazelnuts/

Some caution is warranted when using sulfur to control bud mites around hot weather.

04/21/2023

https://blogs.oregonstate.edu/hazelnuts/low-heat-units-indicate-late-start-to-2023-season/

Growing degree days accumulated since January 1 are running roughly a month behind last season, and 3 weeks behind the 30-year normal on average across 4 sites in the Valley.

04/07/2023

https://blogs.oregonstate.edu/hazelnuts/hazelnut-aphids-are-out/

We are somewhat mystified that we are seeing such a predominance of hazelnut rather than filbert aphid this year. Our research will provide some clues as to whether there is a biological or environmental factor that is leading to more hazelnut aphids.

02/14/2023

https://blogs.oregonstate.edu/hazelnuts/digging-trees-to-determine-nitrogen-content/

Last week the digging and removal of these ‘Jefferson’ trees marked the beginning of the end of a long experiment. Back in April of 2019, we applied some very expensive urea fertilizer around the drip line of theses trees. The cost at that time was not due to supply chain issues, but because we ...

11/04/2022

https://blogs.oregonstate.edu/hazelnuts/aphid-oviposition-egg-laying/

In recent days you may have noticed that there are suddenly a lot of aphids in the orchard. Aphid populations typically enjoy the period after nut drop. The weather cools down, and aphid populations spike. One last hurrah before winter. However you might have noted something odd about where the aphi...

Address

15210 NE Miley Road
Aurora, OR
97002

Opening Hours

Monday	9am - 4:30pm
Tuesday	9am - 4:30pm
Wednesday	9am - 4:30pm
Thursday	9am - 4:30pm
Friday	9am - 4:30pm

Telephone

(503) 678-1264

Website

http://oregonstate.edu/dept/NWREC/

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