Northwest Research and Outreach Center

Northwest Research and Outreach Center
2900 University Ave.
Crookston, MN 56716
Phone: 218-281-8604
Fax: 218-281-8603
quirk010@umn.edu

Cropping Issues in NW Minnesota

August 16, 2012



Soybean Aphid in NW Minnesota

August 16, 2012 - Field reports based on "Speed Scouting"

Wow, who would have thought that soybean aphid would be this insignificant. We have ended "speed scouting" of the fields we've been monitoring. Of the 18+ fields we have monitored since early July, 90% are R-5 or later. Only some June seeded fields are younger (R-4).
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Spider Mite Update

Spider mite activity has become less of a concern for multiple reasons. Growth stage of soybean are reaching R-6 quickly, if not already there. At the R 6.5 stage, soybeans would be considered safe from economic injury due to spider mite feeding.
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Soybean Plot Tours in NW MN

The Minnesota Soybean Growers Association, Minnesota Soybean Research & Promotion Council, University of Minnesota Extension and your County Soybean Grower Associations (Becker/Mahnomen, Clay/Wilkin, Kittson, Marshall, Norman, Pennington/Red Lake, Polk & Roseau/Lake of the Woods) would like to invite you to this year’s northern Minnesota plot tours.
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Performance Problems with Bt-Rootworm Corn: Trait Resistance in Minnesota and Corn Rootworm Management

Bt corn with traits conferring resistance to corn rootworms offer growers a simple, seed-based solution to managing corn rootworms. These traits are far more effective than soil insecticides or seed treatments in protecting corn roots. Corn rootworms have developed resistance to many control tactics over the last 50 years including crop rotation, soil insecticides and foliar insecticides. Read more about corn rootworms in a four page fact sheet "Performance Problems with Bt-Rootworm Corn" written by Bruce Potter, IPM Specialist and Ken Ostlie, Extension Entomologist. 

Evaluate Potential Yields from drought stressed Corn

By David Nicolai, University of Minnesota Extension

ST. PAUL, Minn. (8/17/2012) —The drought and heat stress have taken their toll on kernel numbers in this year’s corn crop in many Minnesota counties through unsuccessful fertilization, aborted kernels, and decreased kernel size and weight.
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Potassium Deficiency in Soybean

During the last 2 weeks as drought conditions have intensified in some areas of the region and as soybeans are entering into a particularly stressful time of seed development, numerous odd potassium-like deficiency symptoms have developed.

In a YouTube video by a friend and colleague, Dr. Jim Camberato at Purdue, the video of soybean clearly shows upper leaves affected, which is totally against book descriptions. I think that much of the yellowing of upper leaves, starting at the leaf margins and moving into interveinal areas, eventually resulting in splotching and necrosis of parts of the leaves is potassium deficiency caused by drought conditions.

The link is www.youtube.com/watch?v=W3jRdftDLF8

Dave Franzen, Extension Soil Scientist, NDSU

Season ending thoughts on Weed Management

by Jeff Stachler, U. of MN and NDSU Extension Agronomist – Sugarbeet / Weed Science

Glyphosate-Resistant Kochia, including:

  • Glyphosate-resistant Kochia documented in Montana

  • Glyphosate-resistant Kochia Management in Wheat Stubble

  • Testing for Herbicide Resistant Kochia


Minnesota Crop News

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Soybean aphid Survey

View aphid reports on presence and population levels for northwest Minnesota based on field scouting reports.

Small Grain Survey

View regional maps summarizing current observations in
Wheat and Barley

Cropping Issues in Northwest Minnesota