Vaughn Walton

2023 Pest Management Guide for Wine Grapes in Oregon

Learn the most effective techniques for controlling insects, weeds and disease on wine grapes in Oregon. This comprehensive publication for growers covers strategies for controlling powdery mildew, botrytis bunch rot and spider mites,...

Patricia A. Skinkis, Jay W. Pscheidt, Achala KC, Marcelo Moretti, Vaughn Walton, Cody Copp | Feb 2023 | OSU Extension Catalog Peer reviewed (Orange level)

Suppressing Spotted-wing Drosophila Egg-laying with Micro-sprinkler Insecticide Application in Highbush Blueberry

Microsprinkler application of certain pesticides suppresses spotted-wing drosophila in highbush blueberries. However, those same pesticides applied by backpack sprayers, provide better control.

Linda Brewer, Christopher Adams, Vaughn Walton | Dec 2022 | OSU Extension Catalog Peer reviewed (Orange level)

Spotted-wing Drosophila, Relative Rankings and Seasonal Strategies for Insecticide Use

Researchers around the country have ranked the effectiveness of the most-used pesticides to control spotted-wing drosophila populations in the field. These recommendations are focused on controlling immature and adult life stages of SWD.

Christopher Adams, Linda Brewer, Vaughn Walton | Aug 2022 | OSU Extension Catalog Peer reviewed (Orange level)

Pest Alert: Spotted Lanternfly is an Invasive Insect That May Impact Oregon

Spotted Lanternfly has a broad range of plant hosts, including grape, stone fruits, apple, ornamental species, maple, black walnut, willow and rose. Nymphs and adults are phloem feeders. They suck sap from young stems and leaves,...

Linda Brewer, Vaughn Walton | Mar 2021 | OSU Extension Catalog Peer reviewed (Orange level)

Testing and Tracking the Spread of Grapevine Red Blotch Virus in Oregon Vineyards

Grapevine red blotch virus (GRVB) is one of about 80 viruses infecting wine grapes worldwide. It may affect fruit ripening and thus impact the quality of finished wines. GRBV incidence increased from two to 10 times annually ...

Alexander Levin, Vaughn Walton, Linda Brewer | Jan 2021 | OSU Extension Catalog Peer reviewed (Orange level)

Monitoring Techniques for Spotted-wing Drosophila

Commercial fruit growers use trapping to monitored for adult SWD in fields and field borders. They monitor other fruits for infestation using a fruit dunk flotation technique.

Vaughn Walton, Linda Brewer | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Potential Impacts of Irrigation on Biocontrol of Spotted-Wing Drosophila

A naturally occurring parasitic wasp in Oregon can help control SWD in the state’s blueberry farms.

Dalila Rendon, Linda Brewer, Vaughn Walton | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Host Range and Characteristics Affecting Fruit Susceptibility to Spotted-wing Drosophila

Spotted-wing drosophila (SWD) can develop on a wide range of cultivated and wild, soft-skinned fruits. This complicates pest management because SWD populations can move among several hosts with different ripening times throughout the year, allowing them to survive and reproduce in many environments.

Vaughn Walton, Dalila Rendon, Linda Brewer | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

How Seasons Affect Population Structure, Behavior and Risk on Spotted-wing Drosophila

Temperatures do affect how quickly SWD reproduce, see how temperatures affect their life cycle.

Vaughn Walton, Linda Brewer, Dalila Rendon, Nik Wiman | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Noncrop Host Plants Used by Spotted-wing Drosophila

Dense vegetation surrounding commercial fields can create a suitable habitat for spotted-wing drosophila due to the shade, coolness and humidity it provides during the summer. Noncrop habitat may contribute to SWD pest pressure and affect sustainable integrated pest management strategies.

Dalila Rendon, Linda Brewer, Vaughn Walton | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Biocontrol of Spotted-wing Drosophila

Multiple biological control agents target SWD, including predators, parasitoids, nematodes and microorganisms such as fungi and bacteria. Predators ambush and eat SWD, removing a substantial portion of them from the production system.

Linda Brewer, Vaughn Walton | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Optimizing Chemical Control of Spotted-wing Drosophila

Crop canopy and structure and the type of pesticide spray equipment help determine the effectiveness of pesticide applications.

Dalila Rendon, Linda Brewer, Vaughn Walton | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

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.

Dalila Rendon, Linda Brewer, Nik Wiman, Vaughn Walton | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Improved Chemical Control Strategies for Spotted-wing Drosophila

Several factors should be considered when designing the best insecticide application strategy against spotted-wing drosophila (SWD). The level of control achieved will depend on the life-stage makeup of the SWD population; the product...

Linda Brewer, Vaughn Walton | Dec 2019 | OSU Extension Catalog Peer reviewed (Orange level)

Sustainable Hazelnut Production: Filbertworm Control by Mating Disruption

Filbertworm is the insect pest of greatest economic importance in Oregon hazelnut production. This publication explains how to Implement mating disruption as a strategy that will reduce damage caused by filbertworm feeding. A mating...

Linda Brewer, Vaughn Walton | May 2018 | OSU Extension Catalog Peer reviewed (Orange level)

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 ...

Spanish: Trissolcus japonicus: Avispa parasitoide prometedora para el manejo de la chinche hedionda marrón marmoleada (CHMM)

David Lowenstein, Chris Hedstrom, Nik Wiman, Heather Andrews, Clive Kaiser, Vaughn Walton | Apr 2017 | OSU Extension Catalog Peer reviewed (Orange level)

How to Monitor for Brown Marmorated Stink Bug in Specialty Crops

The invasive brown marmorated stink bug is a serious threat to Oregon specialty crops, including hazelnuts, tree fruits, small fruits, vegetables, and wine grapes. This insect pest also attacks ornamentals, agronomic crops and native...

Nik Wiman, Linda Brewer, Vaughn Walton | Mar 2016 | OSU Extension Catalog Peer reviewed (Orange level)

Recognize the Symptoms and Causes of Stunted Growth in Vineyards

Spring frost, herbicide drift, water or nutrient stress, diseases, and insect and mite pests can cause similar symptoms of stunting or distorted growth in grapevines. Recognizing the symptoms and distinguishing their causes is the ...

Patricia A. Skinkis, Vaughn Walton, Amy J. Dreves, Clive Kaiser, Steve Renquist, Steve Castagnoli, Rick Hilton, Linda Brewer | Jan 2016 | OSU Extension Catalog Peer reviewed (Orange level)

Biological Control of Black Vine Weevil Larvae in Cranberry

Recommends methods for incorporating biocontrol into a management program for black vine weevil larvae.

Vaughn Walton, Linda Brewer | Mar 2015 | OSU Extension Catalog Peer reviewed (Orange level)

How to Recognize Brown Marmorated Stink Bug Damage in Commercial Hazelnuts

The brown marmorated stink bug is well-established in the Willamette Valley, where virtually all domestic hazelnut production occurs. The BMSB feeds on hazelnuts, and this publication helps growers and scouts learn to recognize BMSB damage to hazelnuts.

Chris Hedstrom, Vaughn Walton, Nik Wiman, Linda Brewer | Dec 2014 | OSU Extension Catalog Peer reviewed (Orange level)

Evaluating Compatibility of Horticultural Oils and Sulfur with Vineyard IPM

Typhlodromus pyri is a beneficial insect and key predator of Calepitrimerus vitis in Pacific Coast vineyards. C. vitis is closely associated with short-shoot syndrome. The impact of horticultural (paraffinic) oils and sulfur on T. ...

Vaughn Walton, Amy J. Dreves, Linda Brewer | Aug 2014 | OSU Extension Catalog Peer reviewed (Orange level)

Distribution and Monitoring of Grape Mealybug: A Key Vector of Grapevine Leafroll Disease in Oregon

A pheromone lure baited with the sex pheromone of grape mealybug is the most reliable way to confirm the presence or absence of this important vector of grapevine leafroll-associated viruses.

Vaughn Walton, Clive Kaiser, Rick Hilton, Linda Brewer | Apr 2014 | OSU Extension Catalog Peer reviewed (Orange level)

Growing Hazelnuts in the Pacific Northwest: Integrated Pest Management

This publication provides an overview of insect, disease, and vertebrate pest management in hazelnut.

Jay W. Pscheidt, Vaughn Walton | Nov 2013 | OSU Extension Catalog Peer reviewed (Orange level)

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 ...

Spanish: El Chinche Apestoso Marrón Marmolado

Chris Hedstrom, Nik Wiman, Vaughn Walton, Silvia I. Rondon | Jan 2013 | OSU Extension Catalog Peer reviewed (Orange level)

Recognize Fruit Damage from Spotted Wing Drosophila

This publication shows damage caused by SWD on blueberries (Duke), raspberries (Malahat), strawberries (Seascape), cherries (Bing, Montmorency, and Rainier), and grapes (Pinot Noir, Chardonnay).

Vaughn Walton, Amy J. Dreves | Dec 2010 | OSU Extension Catalog Peer reviewed (Orange level)

Trapping and Identifying Mealybugs in Oregon Vineyards

This publication gives details on how pheromone traps should be used to ensure optimal catches and early detection.

Amy J. Dreves, Vaughn Walton | Jan 2010 | OSU Extension Catalog Peer reviewed (Orange level)

A New Pest Attacking Healthy Ripening Fruit in Oregon: Spotted Wing Drosophila

Publication provides an overview of spotted wing drosophila identification, biology, damage, monitoring, and control.

Amy J. Dreves, Vaughn Walton | Oct 2009 | OSU Extension Catalog Peer reviewed (Orange level)

Prevention and Management of Grapevine Leafroll Virus and Mealybugs in Oregon Vineyards

This document suggests practices believed to mitigate the spread of disease and virus.

Spanish: Prevención y manejo del virus del enrollamiento de la hoja y de los piojos harinosos en viñedos del estado de Oregon

Vaughn Walton, Amy J. Dreves, Patricia A. Skinkis, Clive Kaiser, Rick Hilton, Steve Castagnoli, Steve Renquist | Oct 2009 | OSU Extension Catalog Peer reviewed (Orange level)

Hazelnut Pest and Beneficial Insects: An Identification Guide

With color photos and text, describes principal insect pests of hazelnuts (filberts) including life stages, symptoms of infestation, and techniques for sampling population levels. Also describes beneficial insects (generalist natural enemies) that can combat pest insects.

Vaughn Walton | Jun 2009 | OSU Extension Catalog Peer reviewed (Orange level)

Grape Phylloxera: Biology and Management in the Pacific Northwest

Describes the life cycle and injury symptoms of grape phylloxera, Daktulosphaira vitifoliae (Fitch), an aphidlike insect that feeds on grape roots. Discusses strategies for reducing the risk of phylloxera infestation, how to sample ...

Patricia A. Skinkis, Vaughn Walton, Clive Kaiser | Jun 2009 | OSU Extension Catalog Peer reviewed (Orange level)

Identification of Invasive and Reemerging Pests on Hazelnuts

Describes key identification features, life cycle, and pest status of filbertworm, filbert weevil, filbert aphid, and hazelnut aphid. Includes color photos.

Vaughn Walton, Amy J. Dreves | Dec 2007 | OSU Extension Catalog Peer reviewed (Orange level)