Dectes Stem Borer Confirmed in Michigan Soybean Fields
The Michigan Soybean Committee identified the southern pest in Mid-Michigan crops during August 2026.
Updated on Sept. 29, 2026 in Botany
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The Michigan Soybean Committee confirmed the presence of the Dectes stem borer in Mid-Michigan soybean fields in August 2026. This pest, typically found in the southern and mid-United States, poses new challenges for northern growers.
Why it matters
The presence of this borer in Michigan suggests a potential northward expansion of a pest that causes significant stem damage to crops. Monitoring efforts are increasing to determine if the presence of this insect is a widespread issue or a seasonal anomaly.
Larvae of the Dectes stem borer damage soybean plants by hollowing out the interior of the stems. Once the interior is consumed, the stem cavity is typically filled with insect waste, which can impact the standability of the crop.
The players
Michigan Soybean Committee
This organization represents the interests of soybean farmers in the state through research, education, and market development programs.
The details
Growers can identify potential infestations by scouting for plants that show reduced standability, which indicates the interior stem damage caused by the larvae. Because the Dectes stem borer is not a standard pest for the region, control options are limited for farmers.
Timeline
The Dectes stem borer was confirmed in Mid-Michigan fields in August 2026.
The Big Picture
The confirmation of the Dectes stem borer in Michigan marks a shift in the geographical reach of this agricultural pest, moving beyond its traditional range in the southern and mid-United States. This discovery challenges existing management practices in northern climates, where farmers have not historically faced this specific borer threat.
Farmers in the affected areas must now incorporate scouting for stem hollowness into their field management routines. The arrival of this pest could eventually lead to higher costs for specialized crop protection as the agricultural community adapts to the new threat.
The takeaway
Proactive scouting for standability issues remains the most effective tool for growers to identify early infestations in their fields. Understanding the signs of larvae activity can help farmers manage the potential impact of this pest before it affects harvest quality.
Further reading
For more information on regional crop health and plant management, visit Michigan Botany.
Source note: This article includes information reported by Brownfield Ag News.
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