Soybean Seedling Injury Symptoms

Friday, October 16, 2015
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By: John Obermeyer

 

"The fungicide fluopyram (ILeVO) is currently marketed as a seed treatment to manage sudden death syndrome (SDS). This seed treatment can result in a discoloration on soybean cotyledons that can resemble disease or other abiotic stress such as herbicide injury. The discoloration occurs because the fungicide is moderately systemic within the soybean plant, so it will naturally move to the plants “sinks”, the roots and cotyledons. This accumulation can result in phytotoxicity, causing the tips of the cotyledons to turn a yellow-brown color. This necrosis is typically uniform and present on every seedling grown from an ILeVO treated seed; however, environmental conditions may impact the frequency, uniformity and severity of the phytotoxicity observed. The phytotoxicity is not usually found on the unifoliate or trifoliate leaves. Research conducted by several Universities demonstrated that this phytotoxicity, also referred to as a “halo effect”, does not result in long-term soybean stunting or yield loss."

 

Link to full article via Purdue University Extension here: Soybean Seedling Injury Symptoms

 

 

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