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Hemp

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Latest stories

OSU Extension hemp web resources reach local, state, national and global audiences

The OSU Hemp Extension Program, based at the Southern Oregon Research and Extension Center in Central Point and led by Govinda Shrestha, Extension statewide hemp specialist, initiated the development of hemp extension education content using a variety of techniques.

Govinda Shrestha | Mar 2024 | Impact story

OSU Extension soil fertility study saves grower costs of applying gypsum to hemp crop

The study showed that the crop performed equally well with and without gypsum and nutritional samples of the hemp flowers did not indicate any problems by discontinuing applications.

Gordon B. Jones | Mar 2023 | Impact story

OSU Extension’s hemp harvest-timing research helps growers stay legal and protect profits

In response to industry concern, Gordon Jones, OSU Extension agriculture faculty in Jackson and Josephine counties, conducted a harvest-time study at the Southern Oregon Research and Extension Center.

Gordon B. Jones | Mar 2022 | Impact story

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Crop management resources

OSU hemp crop production research update

Oregon State University faculty affiliated with the Global Hemp Innovation Center are finishing their hemp plantings for various research purposes. Three OSU research and extension centers are conducting production research. Here is a...

Govinda Shrestha, Everald McLennon, Stephen Baluch, Richard Roseberg, Don Wysocki | Jun 2023 | Article

What is the optimum spacing for hemp plants?

What is the optimum number of hemp plants per acre? The answer depends on what it's being grown for. Fewer plants produce more prized colas or clusters of buds, while denser plantings yield more extractable cannabinoid.

Richard Roseberg | Jun 2022 | Article

Planning a drought-resilient hemp crop

Drought has become a fact of life for farmers throughout the West. For hemp growers, careful planning for where, when and what to plant can result in a crop that will thrive despite dry conditions.

Gordon B. Jones | Jul 2022 | Article

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Statewide Needs Assessment for the Hemp Industry in Oregon

What do Oregon's hemp growers need in terms of research and outreach to help the crop succeed? This study identifies and prioritizes research and educational needs.

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Pest management resources

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

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

Biological pesticide shows potential for controlling corn earworm

Study suggests the biological pesticide Gemstar LC helps control corn earworm in hemp plants.

Alison Merkle, Govinda Shrestha | Oct 2023 | Article

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Plant disease management

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

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

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

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OSU Global Hemp Innovation Center

The Global Hemp Innovation Center is home to the world’s leading experts in hemp research. The largest of its kind in the nation, it promises to advance the research of hemp and its market potential across multiple diverse industries and research fields to serve the growing international demand for innovative approaches to food, health, and fiber.

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Harvest management

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

Corn earworm management in hemp

The corn earworm can cause serious damage to outdoor hemp grown for smokable flower and CBD production in Oregon. Here's what hemp growers need to know to identify, monitor and control the corn earworm.

Govinda Shrestha | Aug 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

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Latest content

Weed Competition and the Critical Weed Free Period in Hemp (Cannabis sativa L.)

The high summertime temperatures experienced in southern Oregon can result in prolific weed growth in hemp production systems. Growers close to the coast region can experience even more weed pressure due to substantial rainfall. ...

Matthew Cutulle, Govinda Shrestha | Aug 2024 | Article Peer reviewed (Gray level)

Hop Latent Viroid in Hemp

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

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

Comparison of stem and fiber yield: Industrial hemp varietal trial

Industrial hemp grows rapidly, with less irrigation water and fewer chemicals than cotton. Some varieties of hemp produce more fiber than others. This study looked at the yields of five hemp cultivars.

Everald McLennon, Brian Charlton, Kyle Carson | Aug 2024 | Extension Catalog publication Peer reviewed (Orange level)

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Meet Our Experts

Govinda Shrestha
Statewide Hemp Extension Specialist and Entomologist for Pest Management
Gordon Jones
Gordon B. Jones
Extension Agronomist
Don Wysocki
Soil Scientist
Cynthia M. Ocamb
Plant Pathologist
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