Dectes Stem Borer Confirmed in Michigan Soybeans

The arrival of this pest in Mid-Michigan soybean fields creates new management challenges for northern growers.

Updated on Sept. 29, 2026 in Botany

Dectes Stem Borer Confirmed in Michigan Soybeans

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In August 2026, the Michigan Soybean Committee confirmed the presence of the Dectes stem borer in Mid-Michigan, marking an expansion for a pest typically found in the southern and mid-United States. This discovery necessitates a reevaluation of pest management strategies in northern soybean production.

Why it matters

The presence of this borer threatens regional soybean yields because control options are historically limited in northern climates. The Michigan Soybean Committee is currently increasing monitoring efforts to determine if this is a localized anomaly or a spreading trend.

The Dectes stem borer is identified by the presence of larvae that consume the interior of soybean stems, leaving behind waste that fills the cavity. Growers track the infestation by scouting for reduced standability—the capacity of the plants to remain upright—in fields.

The players

Michigan Soybean Committee

An industry organization focused on the advancement of soybean production through research, promotion, and the management of regional pest threats.

The details

The borer larvae burrow into the soybean stem to feed, which results in internal stem hollowness that weakens the structure of the plant. This structural compromise often causes the stems to break, a phenomenon growers monitor as a primary indicator of field infestation. Because the pest is non-native to the northern United States, established management protocols are sparse compared to regions where the borer is endemic.

August 2026: Dectes stem borer was confirmed in Mid-Michigan soybean fields.

The Tech Race

The emergence of the Dectes stem borer in Mid-Michigan follows a pattern of agricultural pest migration seen in previous decades with species like the corn rootworm. This migration places the Michigan agricultural sector in a race to develop or adapt containment strategies for a pest that previously lacked a foothold in northern latitudes.

Local growers must shift their scouting practices to monitor for standability issues and stem damage in their fields throughout the season. The committee is currently prioritizing long-term monitoring, and growers should look for future guidance as the extent of the infestation is clarified.

The takeaway

The arrival of this pest highlights the evolving challenges for northern soybean cultivation. Producers should watch for updates from the Michigan Soybean Committee regarding monitoring results and future management recommendations.