Menu

Soybean Stem Borers Feeding

We are starting to see dead leaves caused by feeding of soybean stem borer larvae in south central Nebraska soybeans. No control measures are appropriate at this time, but monitor your fields and be aware that high populations of soybean stem borers may predispose the field to lodging and make harvest difficult. Fields with higher levels of injury by soybean stem borers should be harvested first to minimize lodging losses.

Soybean stem borers are the immature stages of a long-horned beetle, Dectes texanus. The adults lay eggs in the upper leaf canopy, typically in the leaf petiole. Larvae feed by tunneling within the soybean plant. At this time of year larvae move from the leaf petiole into the main stem of the soybean plant, and at that time the leaf dies. These leaves are easily detached from the stem, and a circular tunnel can be seen where the leaf petiole was attached to the main stem.

As larvae grow larger they continue to tunnel within the main stem, and by the end of the growing season they have tunneled to the base of the plant where they overwinter. In preparation for overwintering, they hollow out a cell at the base of the plant, which weakens the stem and makes it more susceptible to breakage.

Source: University of Nebraska

Recent News

Trade and the Farm Economy-Two Charts to Watch in 2020
1/28/2020

Before the ink dried on the newly signed Phase 1 trade agreement, dozens of articles and Twitter threads emerged with clever insights into the nuances and subtleties of the agreement. Most debates focused on the base level China agree to buy up from, and the relevant commodities and products. Stepping back from the details, this […]

Soybeans Need Good News
1/28/2020

Soybean futures prices fell again last week on reports of a coronavirus outbreak rattling the Chinese economy and the prospects of a huge Brazilian crop.  A double hit associated with increased production from our main competitor and a potential drop in Chinese demand appears set to drive prices lower in the near term.  If present […]

Costs of Corn and Soybean Production
1/28/2020

In a recent update from Iowa State University (ISU) Extension (“Estimating costs of crop production vital for 2020 farm businesses“), Alejandro Plastina explained that, “Thin profit margins in corn and soybean production have become the norm over the past five years, increasing the need for proper budgeting and marketing strategies among crop producers.” The ISU update noted that, “On average, the total […]

Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now