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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
Posted in IPM
Tagged Borers, Damage, hazelnuts, Insects, IPM, Oregon, Roots, Willamette Valley
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Heat and sulfur burn in hazelnuts
A few years ago, the Oregon hazelnut industry added a new tool to use against big bud mite: micronated dry flowable sulfur. There are several special local needs labels for different brands that you can find in the Hazelnut Pest … Continue reading
Posted in Environment, IPM
Tagged bud mite, burn, hazelnut, heat, phytotoxicity, sulfur
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Low heat units indicate late start to 2023 season
Winter is holding us tight this year in the Willamette Valley, but it may be finally losing its grip. A break in the rain and warmer temperatures in the forecast will be a relief for hazelnut growers with orchards susceptible … Continue reading
Hazelnut aphids are out
We have been noting aphid emergence over the last two weeks, but there remain a lot of unhatched eggs around the buds and on the bark. The unhatched eggs remaining may be primarily filbert aphid, Myzocallis coryli, as most of … Continue reading
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 … Continue reading
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. … Continue reading
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Organic production research – Orchard Crops Research and Extension Program
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
Posted in Horticulture, IPM
Tagged aphids, cover crop, filbertworm, grafting, oil, organic, pruning, training
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Field grafting hazelnuts
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
Filbertworm eggs in the orchard
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
BMSB egg masses and nymphs now in orchards
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