Fomesafen Carry Over versus Sulfur Deficiency Symptoms

Categories: GROWING, CORN
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“Striping” on corn can be caused by several issues. When corn is growing extremely fast, it relies on the root system to provide nutrients. Early in the season, the root system hasn’t quite reached the nitrogen and sulfur in the soil. As a result, leaves appear striped and falsely indicate nutrient deficiencies. However, most of these symptoms will clear up as the root system continues to develop and enters the nutrient zone. 

Another cause of corn “striping” is carryover of fomesafen from last season. Fomesafen is the active ingredient in products such as Flexstar® herbicide. A handful of factors contribute to this situation:
  • Less than average late-season rainfall the previous year.
  • Persistence of the product in the soil 
  • Pushing label restrictions in regards to the 10-month rotational interval 

So how can you tell if your corn is victim of fomesafen carryover or just hasn’t quite reached the nutrient zone? The key differentiating factor is the effect on the leaf veins. 
  • Fomesafen injury results in chlorotic or necrotic leaf veins. Oftentimes, there are only a few older leaves that will be affected by fomesafen injury, and the injured plant quickly recovers as new growth is generated. In severe cases, there can be a stand loss if extremely high rates of product were applied due to sprayer malfunction or overlap due to field layout.
  • Sulfur striping is classified as “interveinal chlorosis” that is typically found on newer leaves.
The pictures below illustrate fomesafen carryover symptoms. 


 
First few leaves showing fomesafen symptoms, including chlorosis on the veins and white mid-rib
Source: Iowa State Extension – ICM News

 

Fomesafen injury due to sprayer malfunction
Source: Iowa State Extension – ICM News

Contact your Golden Harvest Seed Advisor with questions or for additional agronomic insights.

Photos are either the property of Syngenta or used under agreement.

Syngenta hereby disclaims liability for third-party websites.



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