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Author Archives: Nik Wiman
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. … Continue reading
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
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
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
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
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