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 2016 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. 

Crop Scouting Enrollment Form (PDF)

Current weekly report

August 9 - Scout for Podworms in soybeans

PDF      Audio

Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted fields near Arcola for the August 9 crop scouting update.

Soybean Report
Soybeans ranged from the fourth trifoliate to beginning pod stage.

No podworms were seen. “Scout for podworms once soybeans begin to bloom,” said Scheidt. Threshold for podworm in soybeans are 1 per foot of row or when 5% or more of pods are damaged. “Late planted and double crop soybeans are at greatest risk for podworm damage,” said Scheidt. 

Pod Worm, Soybean Looper and Green Clover Worm

Scheidt observed a few green cloverworms. “They are primarily foliage feeders and unlikely to do significant damage. Threshold for any foliage feeding insect is 30% defoliation before bloom and 20% defoliation during or after bloom,” said Scheidt.

Corn Report
Corn ranged from the milk to soft dough stage.

“Some fields had quite a bit of corn earworm feeding in the tips. Corn earworms, also known as soybean podworms, were less than 1” long in these fields,” said Scheidt.

“Fields with completed pollination, look to have pollinated well. Gray leaf spot and southern corn rust was confirmed in last week’s sample. Corn can benefit from a foliar fungicide if southern rust is present up to the brown silk stage,” said Scheidt.

Milo Report
Milo was in the boot to head stage; no sugarcane aphids were seen. “Low numbers are likely due to timely rainfalls, some of which were heavy. Scout regularly by looking on the underside of leaves for small yellow aphids in clusters. If aphids are found, daily scouting is advised as populations can increase rapidly,” said Scheidt.

Growth Stage specific thresholds for Missouri:

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

Previous crop scouting reports

August 2  PDF | audio

July 26  PDF | audio
July 19  PDF | audio
July 12  PDF | audio
July 5  PDF | audio

June 28  PDF | audio
June 21  PDF | audio
June 14  PDF | audio
June 7  PDF | audio

May 31  PDF | audio
May 24  PDF | audio
May 17  PDF | audio
May 10  PDF | audio
May 3  PDF | audio

April 26  PDF | audio
April 19  PDF | audio
April 12  PDF | audio
April 5  PDF | audio

March 29  PDF | audio
March 22  PDF | audio
March 15  PDF | audio
March 8  PDF | audio
March 1  PDF | audio

February Update  PDF | audio
January Update  PDF | audio


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