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The 2025 Washington State University (WSU) Columbia Basin Onion Cultivar Trial evaluated 44 cultivars and lines using three replicate plots. The onions were planted on March 27 in a drip-irrigated field managed by Weyns Farms east of Othello. Tops down (maturity) and powdery mildew (foliar symptoms) were rated in each plot on August 28 and 29. The onions were harvested on September 23 and evaluated for yield and size distribution. In February, WSU will evaluate the bulbs for quality and bulb rots.
The 2025 WSU Onion Cultivar Trial Report (yield and size distribution, powdery mildew) is available HERE (scroll down to demo results). The link also gives you access to previous onion cultivar field demonstration and storage evaluation reports.
For more on powdery mildew: The most recent issue of Onion World magazine recaps the 2025 WSU Onion Field Day and features advice from Dr. Lindsey du Toit on powdery mildew management. The issue can be accessed HERE.
