Cynthia M. Ocamb

Plant Pathologist

541-737-4020
[email protected]

Expertise: Hemp , Plant diseases

Department/Unit: Botany and Plant Pathology

Content by Cynthia M. Ocamb

OSU Extension collaborates with Oregon IPM Center to answer pest management questions

The center focuses on discoveries and new thinking related to sustainable agriculture and integrated pest management.

Francesca Lear | Jan 9, 2025 | News story

Oregon researchers part of first-of-its-kind national research partnership in organic seed production

A coalition that includes three Oregon State University Extension Service researchers was awarded a $3.4 million grant from the U.S. Department of Agriculture to improve organic seed production, both in the Pacific Northwest and nationally.

Henry Carnell | Oct 17, 2024 | News story

Hop latent viroid in hemp

Hop latent viroid (HLVd) is a pathogenic RNA particle first reported in cannabis plants in California in 2019. It has since been reported in cannabis growing in Oregon, Washington, and Canada. HLVd is common in hop plants and...

Cynthia M. Ocamb | Aug 2024 | Article Peer reviewed (Gray level)

OSU studies the effects of pathogen attacking Pacific Northwest hop fields

OSU is using a federal grant to research the effects of Fusarium canker on hops.

Henry Carnell | Jun 13, 2024 | News story

Beet Curly Top Virus in Hemp | Western IPM Center | June 2023

Punya Nachappa, Ph.D. (Department of Agricultural Biology, Colorado State University), Cynthia M. Ocamb, Ph.D. (Botany and Plant Pathology, Oregon State University), Carol Mallory-Smith, Ph.D. (Crop and Soil Science, Oregon State ...

Govinda Shrestha, Cynthia M. Ocamb, Carol Mallory-Smith, Ph.D., Punya Nachappa, Ph.D., Rebecca Creamer, Ph.D. | May 2024 | Video

Managing Powdery Mildew in Greenhouse Tomato in Western Oregon

In the Pacific Northwest, tomatoes crucial for farm income face powdery mildew threats. Farmers combat with fungicides, posing challenges for organics. UV-C light offers promise in high tunnels, but research is needed for optimization and minimal impact on plant growth.

Kristine Buckland, Cynthia M. Ocamb, Ann Rasmussen, Lloyd Nackley | Jan 2024 | Extension Catalog publication Peer reviewed (Orange level)

Statewide Needs Assessment for the Hemp Industry in Oregon

This needs assessment identifies what is known about hemp cultivation and knowledge gaps recognized by industry members, including growers, processors and allied stakeholders. This information will help establish priorities...

Govinda Shrestha, Cynthia M. Ocamb, Hannah Rivedal, Achala KC, Jeremiah Dung, Kenneth Frost, Don Wysocki, Stuart Reitz, Jeffrey Steiner | Dec 2023 | Extension Catalog publication Peer reviewed (Orange level)

IPM Strategic Plan for Fresh Market Brassicas in Northwest Oregon and Southwest Washington

Growing brassicas crops in Oregon and Washington requires whole-season management to control pests. Learn how integrated pest management can neutralize pests and improve crop yields.

Chris Hedstrom, Cynthia M. Ocamb, Nick Andrews, Kristine Buckland, Heidi Noordijk, Silvia I. Rondon | Nov 2023 | Extension Catalog publication Peer reviewed (Orange level)

How to control Sclerotinia and Botrytis diseases in hemp

Hemp canker and gray mold management includes cultural control practices to improve air circulation and minimize leaf wetness. Proper plant spacing, plant pruning and irrigation timing help accomplish this. If Sclerotinia is detected,...

Cynthia M. Ocamb | Sep 2023 | Article

Aspergillus ecology and mitigation strategies in hemp production

Potential mitigation strategies for Aspergillus in indoor and outdoor hemp cultivation systems.

Qingyang Wang, Cynthia M. Ocamb, Govinda Shrestha | Sep 2023 | Article

Aspergillus Workshop

OSU Extension hosted Aspergillus Workshop on August 24, 2023. Recordings and presentation PDFs are linked below. Biology and Ecology of Aspergillus species Dr. Cynthia Ocamb, Associate Professor and Extension Plant Pathology Specialist,...

Govinda Shrestha, Cynthia M. Ocamb, Qingyang Wang | Aug 2023 | Article

What to consider to minimize root rot and damping-off in hemp

In cooler weather, such as what Oregon experienced in June 2023, hemp crops are susceptible to root rot. Here's how you can avoid that problem in your crop.

Cynthia M. Ocamb | Aug 2023 | Article

How to minimize crop loss in hemp from beet leafhopper and beet curly top virus

How to reduce hemp crop losses to beet curly top virus.

Govinda Shrestha, Cynthia M. Ocamb | Jul 2023 | Article

Hemp Disease Workshop

OSU Extension hosted a Hemp Disease Workshop in April 2023. The event was created in support of the Western IPM Grant. Recordings are linked below. Hemp Powdery Mildew in the Pacific Northwest Dr. Cynthia Ocamb, Associate ...

Cynthia M. Ocamb, Govinda Shrestha | May 2023 | Article

Potato Nematode Root-Knot Problem

The northern and Columbia root-knot nematode attacks potatoes and causes injury to tubers in the Columbia Basin of Oregon and Washington as well as other areas of the Pacific Northwest. Both nematodes blemish tubers and may render them unmarketable.

R. E. Ingham, Phil Hamm, Cynthia M. Ocamb | Mar 2023 | Online resource Peer reviewed (Gray level)

How to prevent gray mold in hemp

Gray mold outbreaks on hemp caused the fungus Botrytis cinerea can spread easily and quickly kill plants. Here's how hemp growers can create conditions that will keep gray mold at bay.

Cynthia M. Ocamb | Sep 2022 | Article

Management of powdery mildew on hemp in the Pacific Northwest

Powdery mildew has surfaced as a challenge for Northwest hemp growers. Powdery mildew coats the leaves of hemp plants and leads to a decline in quality. Here's what hemp growers can do if powdery mildew turns up.

Cynthia M. Ocamb | Aug 2022 | Article

Wilt diseases in hemp and their management in the Pacific Northwest

Hemp is susceptible to fungal pathogens that induce wilt disease that can kill plants. The fungi that cause the disease can survive for years and are easily spread. But there are steps growers can take to prevent it.

Cynthia M. Ocamb | Jul 2022 | Article

Hemp seedling diseases and their management in the Pacific Northwest

Hemp plants are susceptible to disease, especially at the early stages of development. Hemp growers can promote healthy plants by using high-quality seed and avoiding soil that is wet, dense or poorly drained.

Cynthia M. Ocamb | Jun 2022 | Article Peer reviewed (Gray level)

PNW Plant Disease Management Handbook

A comprehensive guide to plant disease management in the Pacific Northwest. Includes materials and tactics suitable for organic production and homeowner use as well as for commercial production. Covers testing services,...

Jay W. Pscheidt, Cynthia M. Ocamb | May 2021 | Extension Catalog publication Peer reviewed (Orange level)

Perennial Ryegrass Grown For Seed (Western Oregon) Nutrient Management Guide

This guide provides nutrient and lime recommendations for establishment of turf and forage perennial ryegrass grown for seed in western Oregon. Healthy plants with adequate root systems are required to obtain the ...

John M. Hart, Nicole Anderson, Thomas G. Chastain, Michael D. Flowers, Cynthia M. Ocamb, Mark E. Mellbye, William C. Young III | Oct 2017 | Extension Catalog publication Peer reviewed (Orange level)

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