Herbicide, Physiological, and Other Disorders

Herbicide Drift

Herbicide Drift and Damage

Herbicide drift and resulting damage can cause serious problems in vineyards. However, herbicide damage is often confused with plant diseases, especially those caused by viruses. Below are links to resources that can help you identify potential herbicide damage, and how to reduce drift:

• Field Guide for Integrated Pest Management in Pacific Northwest Vineyards – #PNW644
• Pesticide Drift Management – OSU #EM8934
• Preventing Herbicide Drift and Injury to Grapes – OSU #EM8860

Washington State Rules and Regulations – Herbicide Drift

• Penalties and Fees for Drift – WAC 16-228-1130
• Unlawful Pesticide Use – RCS17.21.150

Disorders and Environmental Stressors

Physiological Disorders

• Berry Shrivel – WSU Website
• Blackleaf in Grapes – WSU #EB0745

Smoke Exposure – WSU Wepage

Water Stress

• Drought Advisory for Grapes (.pdf) – WSU #EM4831e
• Irrigation Strategies for Grapes – Webpage