Weekly Crop Scouting Report

July 22 - Late planted soybeans must beat freeze

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Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted fields near Arcola in Dade County and near Verdella in Barton County on July 22.

Corn Report
Scheidt observed corn that was finished pollinating and either in the blister or milk stage.

To find out how well your corn pollinated view Scheidt’s video, “How to tell how well corn pollinated.” 

“Once pollination has occurred, silks are no longer needed, and Japanese beetles are not a threat,” said Scheidt.

Soybean Report
Scheidt observed soybeans ranging from emerging to bloom stages.

“Japanese beetle populations are lowering and should not be of much concern,” said Scheidt.

Threshold levels for Japanese beetle in soybean are 30 percent defoliation before bloom and 20 percent defoliation during and after bloom.

Bill Wiebold, plant science professor at University of Missouri conducted a two-year study on this issue. Using a seeding population of 150,000 seeds per acre and a maturity group three, soybeans planted in mid-July yielded around 30 bushels per acre.

Over 30 years of data from University of Missouri weather stations suggests that the median probability date for a killing freeze, of 28 degrees, begins Nov. 7.

“Soybean yield is protected from frost if the plants have reached physiological maturity. If a killing frost occurs before this time, harvest will be difficult and soybeans are likely not to change color,” said Scheidt.

The weekly field scouting report is sponsored by University of Missouri and Barton County Extension. For more information on the scouting report, or to learn how to receive the information earlier by telephone, contact the Barton County Extension Center at (417) 682-3579.

Additional resources:

2015 Pest Management Guide

Make the most from late planted soybeans

Assessing soybean plant stands

Previous weekly crop reports


2015 Crop Scouting Program enrollment

The Crop Scouting Telephone Update informs producers of pest threats.  A weekly, 2 minute recorded message and an email is sent out containing research based information on: environmental issues, nutrient deficiencies, pest threshold level, pest description, damage description and pest control.  Several fields in Barton County and surrounding counties are physically scouted each week; the report is based on those observations. 

Weekly scouting begins in mid March and ends in November; monthly telephone and email updates run November to February.

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

The weekly field scouting report is sponsored by University of Missouri Extension and Barton County Extension.  To receive the 2015 weekly scouting reports, print the 2015 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.

2015 Crop Scouting Enrollment Form


Links to other resources:

Current soil temperatures in Lamar are updated every five minutes and can be found at http://agebb.missouri.edu/weather/realtime/lamar.asp

Popular extension publications

MU Extension publication G427, 2011 Cash Rental Rates in Missouri
MU Extension publication G302, 2009 Custom Rates for Farm Services in Missouri
MU Extension publication G6201, Vegetable Planting Calendar