Crop Scouting Reports

Crop scouting is an essential part of integrated pest management (IPM). Scouting programs are designed to protect and maximize crop yield and quality while minimizing the risk associated with pesticide use. 

Each week, an extension agronomy specialist scouts fields in Barton County and then report their findings through an automated phone service and email message. The message will go out to everyone signed up for the program.

The weekly field scouting report is sponsored by University of Missouri Extension and Barton County Extension.  To receive the 2019 weekly scouting reports, print the Crop Scouting Enrollment Form, complete and return with payment to Barton County Extension, 801 E 12th, Lamar, MO 64759 or contact the MU Extension Center in Barton County, 417-682-3579.

The cost of the program is only $35 per phone number, $95 for three numbers and $30 per phone number for those with four or more. 

Current Report

 Crop Scout Report for April 4th, 2019


Hello, this is Mike Dennigmann, agronomy intern, with your April 4th crop update. Reminder, turn in your crop scouting payment by April 8 to guarantee receiving the message while Jill is on maternity leave.

Fields scouted just west of Lamar.

Wheat was in the tillering stage, with a few plants starting to move into the jointing stage.  The jointing stage is a critical stage in wheat development. To determine if a plant is at jointing, examine the main stem of the plant, and use your fingers to feel for a small bump at the base of the shoot. A nitrogen application needs to be made before jointing to prevent injury that could result in lower yield.  Yellowing of the leaves could indicate a nitrogen deficiency.  If you are seeing a purple tip on the leaves of your wheat, that indicates a temporary phosphorus deficiency due to the cold weather.

Right now, we are not seeing much weed pressure, however, some henbit was found. If the purple flowers have already emerged, then it has already dropped seed and it will not be effective to spray.  Henbit can cause yield reduction in wheat if present in high densities. The best time to spray for weeds is when height or diameter of the weed is 2-4 inches.

I did not find any aphids, which are not usually active until temperatures are consistently above 60 degrees Fahrenheit.  Aphids are extremely small but can be seen on the stem, and on the undersides of the leaves.  They are also typically found in the more lush areas of the field.

According to the Lamar Weather Station, the 2-inch bare soil temperature was 48 degrees Fahrenheit, April 3 at 9am. Corn germinates at 50 degrees.

Calls will go out Thursday at 9am until mid-May; after that, they will go out Wednesday at noon, like normal. Call 417-682-3579 for more information, thank you.

Crop Scouting Enrollment Form (pdf)




MU Extension
University of Missouri Extension programs focus on the high-priority needs of Missourians to improve lives, communities and economies by providing relevant, responsive and reliable educational solutions. Each county extension center, with oversight by locally elected and appointed citizens, is your local link to practical education on almost anything. More information on this topic is available online at


Links to other resources:

Recommended fungicides for stripe rust

University of Florida velvetbean caterpillar information

"Estimating Corn Grain Yield prior to Harvest"  (Purdue University

“Grain Fill Stages in Corn” article from Purdue University

2015 Pest Management Guide

Make the most from late planted soybean

Assessing soybean plant stands


Current soil temperatures in Lamar are updated every five minutes and can be found at