Lynn Ketchum

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Biology and Management of Beet Leafhopper and Purple Top in Potatoes in the Pacific Northwest

Leafhoppers damage potatoes by feeding on the plants, or by transmitting viruses and phytoplasmas, which are small bacterial parasites of plant phloem tissue. Phytoplasmas cause purple top disease, which reduces yield and produces ...

Silvia I. Rondon | Apr 2020 | OSU Extension Catalog

Wheat virus is bigger problem in Pacific Northwest than previously thought

Wheat soil-borne mosaic disease was first detected in the Walla Walla Valley along the Oregon and Washington border in 2008.

Chris Branam | Mar 2, 2020 | News Story

Managing Diseases and Insects in Home Orchards

This pest management guide is for the home gardener. It recommends management practices for controlling diseases and insects in home orchards. It doesn't meet the exacting requirements of the commercial fruit grower.

Nik Wiman, Heather Stoven, Jay Pscheidt, Brooke Edmunds | Mar 2020 | OSU Extension Catalog

Dig into hundreds of publications from OSU Extension online catalog

Have a gardening question? Find an answer in one of OSU Extension's publications.

Kym Pokorny | Nov 22, 2019 | News Story

The Impacts of Bacterial Soft Rot Pathogens of Potato

Jessie Brazil is a Botany and Plant Pathology Masters student at Oregon State University. Jessie does her research at the Hermiston Agricultural Research and Extension Center. The focus is on studying soft rot of potato. This ...

Kenneth Frost | Oct 2019 | OSU Extension Catalog

Tackling Potato Virus Y, a Persistent Problem in Potato Production

Oregon State University Masters student Max Combest explains issues related to Potato Virus Y (PVY). He is doing research of PVY in potato production in the Pacific Northwest and worldwide. He is looking to understand the ...

Aymeric Goyer | Oct 2019 | OSU Extension Catalog

Aggressive local efforts were key to limiting spread of sudden oak death disease in Oregon

Limiting sudden oak death’s spread in southern Oregon has proved to be a success.

Chris Branam | Aug 19, 2019 | News Story

Bigleaf maple decline

Forest pathologists in Washington have been investigating the decline of bigleaf maple (Acer macrophyllum) in the Pacific Northwest since it emerged in 2010. This year, Dave Shaw, OSU Extension Forest Health Specialist, has noticed ...

Alicia Christiansen | Aug 2019 | Article

Can I compost plants with powdery mildew?

Q: Can I compost plants with powdery mildew in the City of Portland's yard debris pickup? I called Metro's Recycling Hotline. The person that I talked to wasn't familiar with powdery mildew, but suggested that I put the infected plants in the garbage rather than the yard debris.

A: View answer | View all featured questions

7 tips for controlling frustrating apple scab

Prevention is the best method when it comes to controlling this fungal disease.

Kym Pokorny | Apr 26, 2019 | News Story