1. Topics
  2. Pests, Weeds, and Diseases

Plant Diseases

Photo: Lynn Ketchum (Cropped from original)

Browse resources

Displaying 1 - 10 of 123 resources

OSU Wheat Breeding Program makes gains in disease resistance

OSU scientists are hard at work developing new stripe rust-resistant varieties

Jun 2021 | Impact story

Potato Psyllid Vector of Zebra Chip Disease in the Pacific Northwest

This publication addresses the emergent issue in the Pacific Northwest of a potato infection called zebra chip disease, vectored by the potato psyllid. Includes information on the bacterium, the biology of the vector, description ...

Silvia I. Rondon, Darrin Walenta, Stuart Reitz | Apr 2021 | OSU Extension Catalog

Phytophthora ramorum: A Guide for Oregon Nurseries

The funguslike organism Phytophthora ramorum has been causing severe plant disease problems for nurseries and homeowners in California and, now, in Oregon and Washington. This guide helps wholesale nursery personnel identify possible ...

Jay Pscheidt | Mar 2021 | OSU Extension Catalog

2021 Pest Management Guide for Wine Grapes in Oregon

Learn the most effective techniques for controlling insects, weeds and disease on wine grapes in Oregon. Easy-to-read tables list pesticide application rates and timing. This comprehensive publication for growers covers strategies for ...

Patricia Skinkis, Jay Pscheidt, Marcelo Moretti, Vaughn Walton, Achala KC, Clive Kaiser | Feb 2021 | OSU Extension Catalog

Should I leave my fig leaves on the ground?

Q: I have a big fig tree in my backyard. I have always been removing all the fallen leaves this time of the year as I was told that any dead leaves could give rise to increase in insects and plant diseases. I wonder ...

A: View answer | View all featured questions

$1 billion Oregon nursery industry benefits from OSU plant trials

Oregon State University Extension Service has a long history of assisting the state’s nursery industry.

Neil Bell | Sep 2020 | Impact story

Will growing tobacco put my garden plants at risk?

Q: I'm interested in planting a tobacco plant in my home garden from seed. I've heard of tobacco mosaic virus and how it can spread from the fingers of someone who has handled tobacco or from insects between infected plants. ...

A: View answer | View all featured questions

Pandemic leads to unprecedented burst of questions to Ask an Expert tool

Questions have ballooned to 6,625 in the first half of 2020, more than all of the questions answered in 2019.

Kym Pokorny | Jul 29, 2020 | News story

Integrated Clubroot Control Strategies of Brassicas: Nonchemical Control Strategies

Clubroot (causal organism, Plasmodiophora brassicae) is a major soilborne disease of brassica crops in the Willamette Valley. It’s incidence and severity is increasing due to a high demand for brassicas that has resulted in more...

Aaron Heinrich, Alexandra Stone, Dan Sullivan, Ed Peachey | Jul 2020 | OSU Extension Catalog

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