WSU Extension Publications|Pests, Plant Diseases, and Weeds

Acid Soils- How Do They Interact with Root Diseases? (Soil Acidification Series)

As soil acidification continues to be a concern for growers in the Pacific Northwest, WSU researchers are working to provide information and recommendations for how to mitigate adverse effects. Root d ...

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Anobiid Beetles in Structures

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The anobiid beetles can cause a lot of structural damage to wooden buildings before being discovered because they are usually out of sight. Hemicoelus gibbicollis (Le ...

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Antibiotic Residues and Use Patterns on Apples and Pears

The use of antibiotics in agriculture is under scrutiny because of concerns about the potential for development of resistance to medical antibiotics. This publication discusses the use of antibiotics ...

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Apple Scab

Apple scab is a fungal disease that is most common in areas of high rainfall and relative humidity. Spots and lesions develop on leaves and fruit. Illustrations identify symptoms and describe the fung ...

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Apple-And-Thorn Skeletonizer

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Following mild winters, the apple-and-thorn skeletonizer, Eutromula pariana, can be a serious pest in home orchards. It affects all fruit growing areas of Washington state. ...

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Aquatic Pest Control

Describes state and federal regulations involving pest control in aquatic environments. Acute and indirect effects of aquatic pesticide use.

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Bacterial Ring Rot on Potatoes

This fact sheet outlines the disease cycle of ring rot, and approaches for sanitation and control by commercial potato growers and seed potato growers alike. ...

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Bacterial Soft Rot and Lenticel Spot on Potato Tubers

Bacterial lenticel spot is one manifestation of bacterial soft rot on potato which is initiated at tuber lenticels. Soft rot is a wet, mushy rot of plant tissues that progresses rapidly, especially wh ...

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Biofumigant Cover Cropping in Potatoes: Dale Gies (Farmer to Farmer Case Study Series)

This case study is part of the Farmer-to-Farmer Case Study project, which explores innovative approaches regional farmers are using that may increase their resilience in the face of a changing climate ...

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Biological Control of Noxious Weeds

View Part 1 here!

View Part 2 here!

Biological control, or biocontrol, is the ...

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Biology and Management of the Potato Tuberworm in the Pacific Northwest

The potato tuberworm is an important pest worldwide, and has become a major concern for potato production in the Pacific Northwest in the last 5 years. Protecting potatoes with an integrated approa ...

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Biology of Hop Looper and its Natural Enemies

The hop looper is a native noctuid moth that was first reported as a pest of hops in the mid-1800s, but until recently has generally been regarded as a relatively minor and sporadic problem. Howeve ...

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Blackleaf in Grapes

Recent research shows that blackleaf in grapes is due to a combination of water stress and high UV-B radiation. Learn how to identify and control this disease in Concord and winegrapes by addressin ...

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Bronze Birch Borer

Planting birch trees as ornamentals has resulted in the spread of the bronze birch borer (Agrilus anxius Gory). Full color photographs and discussion cover symptoms, life history, stages from e ...

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Cabbage Seedpod Weevil Management in Canola (Oilseed Series)

As winter canola acreage increases in Washington State, the cabbage seedpod weevil is becoming a problem. In addition to canola, this tiny weevil can also feed on flixweed, tansy mustard, and whitetop ...

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Carpenter Ants: Their Biology and Control

Descriptions, drawings, and color photos of carpenter ants in different stages and habitats. Colony and damage photos included. Cultural and chemical control methods. No products recommended. ...

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Caterpillar Pests of the Cabbage Family

The imported cabbage worm, diamondback moth, several loopers, and a number of cutworms and armyworms all thrive on members of the cabbage family.

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Cereal Cyst Nematodes: Biology and Management in Pacific Northwest Wheat, Barley, and Oat Crops

Describes a species of nematodes known to cause significant economic losses in wheat, barley, and oat crops grown in the Pacific Northwest. Includes ways to identify the pest and its specific damage, ...

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Cherry Bark Tortrix Enarmonia formosana (Home Garden Series) Replaces EB1893

Cherry bark tortrix, Enarmonia formosana (CBT), is a major invasive pest of many shrubs and trees, especially those in the Rosaceae family. The larvae of this broad-winged moth are bark borers whose ...

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Cherry Training Systems

Describes the seven major pruning systems used in commercial cherry tree orchards in Oregon, Idaho, Washington, and Michigan. Includes overall goals and critical steps for major stages within each.

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Common Bacterial Blight and Halo Blight: Two Bacterial Diseases of Phytosanitary Significance for Bean Crops in Washington State

This fact sheet has been prepared to increase awareness of seed-borne bacterial diseases that afflict bean plants—both edible bean crops and bean seed crops. ...

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