Author Archives: Nik Wiman

Organic production research – Orchard Crops Research and Extension Program

Posted on August 19, 2022 by Nik Wiman

Organic Hazelnut Farm Tour E-Handout, Aug. 19, 2022 Nik G. Wiman (+ Team), Orchard Specialist & Associate Professor contact: Nik.Wiman@oregonstate.edu Organic Pest Management Aphids Aphid management tactics Aphid biological control Filbertworm Organic sprays BMSB Organic sprays Biological Control Cultural Practices … Continue reading →

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Field grafting hazelnuts

Posted on August 11, 2022 by Nik Wiman

Field grafting of hazelnuts has been practiced for many years in Oregon but is not a widespread or common practice. Some in the industry such as David Smith of the OSU Hazelnut Breeding Program have a wealth of knowledge on … Continue reading →

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Filbertworm eggs in the orchard

Posted on July 23, 2022 by Nik Wiman

Orchards in the Willamette Valley have now received enough heat units to have filbertworm eggs (>815 degree-days since April 1) and most have now achieved first egg hatch (955 degree-days). Some orchards will already have a few larvae entering nuts … Continue reading →

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BMSB egg masses and nymphs now in orchards

Posted on July 20, 2022 by Nik Wiman

Brown marmorated stink bug (BMSB, Halyomorpha halys) is a direct pest of hazelnuts across its invaded range worldwide including in the Pacific Northwest. Our program began redistribution efforts of the biological control agent Trissolcus japonicus soon after it was discovered … Continue reading →

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Brown, aborted nuts linked to Pseudomonas infection

Posted on July 19, 2022 by Nik Wiman

Hazelnut growers around the world are familiar with the bacterial pathogen Xanthomonas arboricola pv. corylina, which is the cause of bacterial blight. Historically, no other bacterial pathogens have been problematic in Oregon hazelnuts. However, this season I became concerned with … Continue reading →

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Rusty Tussock Moth in Hazelnuts

Posted on July 19, 2022 by Nik Wiman

We have noted the presence of rusty tussock moth (Orgyia antiqua) feeding in our hazelnut plots for the last two seasons. This insect seems not to be a pest, only an incidental feeder that causes minor defoliation. The larvae are … Continue reading →

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