Crop & Pest Report


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South-Central/Southeast ND (05/20/21)

Information from the South Central/Southeast region of North Dakota.

According to NDAWN, the region’s rainfall during May 1 through 17 totalled one inch in McIntosh County (Zeeland), while many other locations received one-third inch or less. If you are reading this article on May 20, hopefully you also are watching it rain (as earlier forecasted)!


Alfalfa regrowth at the CREC is at <8-inch height. Winter rye and winter wheat growth stages range from tillering to emerging flag (see picture). Most advanced spring-planted small grain are tillering. Plant densities are variable with dieback occurring in some fields due to dry topsoil. Corn and soybean planted acres are at 75% or greater. April-planted corn is emerging.

Prominent annual weeds at the CREC include wild buckwheat, common lambsquarters and foxtail, and pigweed species have started to emerge. Leafy spurge bracts are out and flowers are starting to open.

The following are NDSU’s guidelines for dry bean plant populations by row spacings:

  • Black - 90,000 to 120,000 plants/A (across rows)
  • Navy - greater than 115,000 plants/A with 22-inch rows or narrower; 90,000 plants/A with wide rows 
  • Pinto - greater than 80,000 plants/A with 18- to 22-inch rows (preliminary; trials continue in 2021 at Carrington and Langdon RECs); 70,000 plants/A with wide rows


If winter rye was planted last fall as a cover crop on land to be planted to dry bean this spring, carefully monitor topsoil moisture and consider weather forecast as termination timing of rye is determined in relationship to dry bean planting. Considering our lack of topsoil moisture, it would be wise to terminate rye with glyphosate as soon as possible. As an example, in four years (2017-20) of research at the Carrington REC, all years with relatively dry springs, pinto bean yield was reduced an average of about 25% when ‘planting green’ (beans planted into living rye) compared to terminating rye at least two weeks before bean planting. In dry conditions, delaying rye termination allowed the cover crop to remove topsoil moisture needed to timely establish the bean crop.


 Greg Endres

Extension Cropping Systems Specialist

NDSU Carrington Research Extension Center

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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