Extension Service Site Publications

• (2024) Hop Latent Viroid in Hemp
• (2023) 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 for future research and outreach efforts for the hemp industry across the state. This study aimed to identify and prioritize the research and educational needs of Oregon hemp growers and other industry members.
• (2024) 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.
• (2023) 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, growers should remove and destroy infected plant portions. Rotating with nonhosts for eight years best controls of Sclerotinia while rotating for at least two years reduces the population of sclerotia. Contans WG, certified for organic production, can be used as a preplant or postharvest soil application to reduce sclerotia survival.
• (2023) Aspergillus ecology and mitigation strategies in hemp production Potential mitigation strategies for Aspergillus in indoor and outdoor hemp cultivation systems.
• (2023) Aspergillus Workshop
• (2023) 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.
• (2023) 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.
• (2023) 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.
• (2023) 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.
• (2023) Hemp Disease Workshop
• (2022) 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.
• (2022) 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.
• (2022) 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.
• (2022) 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.
• (2021) 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, common pathogens (such as nematodes, viruses, fungi and bacteria, as well as Phytophthora diseases), nonpathogenic phenomena (such as thatch, algae and lichens), and pesticides for disease control. Contains an alphabetical listing, by the host plant, of diseases, including their causes, symptoms, and recommended cultural and chemical controls. Fully indexed. Updated annually.
• (2013) 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 greatest return from your fertilizer investment. The nutrient recommendations in this guide assume that adequate control of weeds, insects, and diseases is achieved. Lack of pest control cannot be overcome by the addition of nutrients.