By Meghan Moran, OMAFRA Canola and Edible Bean Specialist
Have you ever had a dry bean crop that looked healthy but resulted in disappointing yields? Have you seen stunted or yellowing patches, but could not identify the cause? If so, you may want to look for soybean cyst nematode (SCN).
Researchers in Ontario and the U.S. have shown that SCN is not just a soybean pest, it also reproduces on dry beans. SCN saps nutrients from the plant and can restrict root growth. There may or may not be visible above ground symptoms when beans are infected with SCN.
The impact of SCN on dry beans depends on the market class, and may also depend on the specific variety. AAFC researchers planted 40 dry bean varieties in SCN infested fields in 2010-2011, and about half had cyst counts similar to the SCN-susceptible soybean variety. These included cranberry, dark red kidney, and white bean varieties. Other trials have shown that adzuki beans are very susceptible to SCN, more so than susceptible soybeans.
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