​​Yellow Flash in Soybean

May 2011 | 28 min., 45 sec.
by Mark Bernards
University of Nebraska–Lincoln

Summary

​Yellow flash is the temporary chlorosis of newly emerging soybean leaves that sometimes occurs following the application of glyphosate to glyphosate-resistant soybean cultivars. Yellow flash is most likely to occur when environmental conditions are warm and moist, favoring rapid soybean growth, and/or when high rates of glyphosate are applied. This temporary chlorosis results from a reduction in chlorophyll content in the affected leaves. Yellow flash has not been shown to affect soybean yield. This presentation will discuss the most likely mechanism by which yellow flash occurs, and discusses the relationship of glyphosate and manganese in soybean growth and yield.

About the Presenter

Mark BernardsMark Bernards is an Extension Weed Scientist at the University of Nebraska–Lincoln. He coordinates the annual UNL Extension Crop Production Clinic and delivers weed management information in newsletters, publications, and presentations. He conducts weed management research for corn, soybean, and grain sorghum cropping systems in southeast and south central Nebraska. His research interests include: adjuvant effects on herbicide activity, micronutrient interaction with glyphosate, biology and control of winter annual weeds, herbicide resistance, and off-site movement of pesticides. He received BS and MS degrees in Agronomy from Brigham Young University, and a PhD in Crop and Soil Science from Michigan State University.​

Contact Information:
Email: mbernards2@unl.edu



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