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, extension agronomy specialists and agronomy assistants scout 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 cost of the program is only $35 per phone number, $95 for three numbers, and $30 per phone number for those with 4 or more. For more information about the program, call the Barton County Extension Center at 417-682-3579.
To receive the 2013 weekly scouting reports, print the 2014 Crop Scouting
Enrollment Form, complete and return with payment to Barton County Extension, 801 E 12th, Lamar, MO 64759.
Current weekly report
Low levels of insects popping up in crop fields
Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted fields northeast of Lamar near Hwy. A and Hwy. EE on July 16.
Corn is in the milk stage and corn earworms were seen feeding on kernels. “In one field I was finding one earworm in 5 out of 10 stalks, but in the majority of fields, one or no earworms every 10 stalks,” said Scheidt.
According to Wayne Bailey, state entomologist with University of Missouri Extension, there is no recommended threshold level; insecticide treatments are not economical because multiple applications are needed to obtain effective control.
“Corn earworms cause less than one percent yield loss because they feed on the tip, where the kernels don’t always fill,” said Bailey. Bailey suggests the following best management practices: early planting, selecting BT varieties with corn earworm resistance and varieties with tight husks.
According to Laura Sweets, state pathologist with University of Missouri Extension, fungicides are most profitable when disease or weather conditions favoring disease and disease susceptible varieties are present. “The optimum time to apply fungicides is from tasseling to the blister stage in corn,” said Sweets.
Soybeans were in the first trifoliate to bloom stage. “I saw bean leaf beetle, blister beetle, grasshopper and Japanese beetles feeding but not at threshold levels,” said Scheidt.
Threshold levels for all foliage feeding insects are: 30 percent defoliation before bloom and 20 percent defoliation during and after bloom.
“Defoliation refers to the whole plant, so the whole plant must have 20 or 30 percent defoliation,” explains Scheidt.
The weekly field scouting report is sponsored by University of Missouri Extension and Barton County Extension. For more information on this scouting report, or to learn how to receive it a week earlier by telephone, contact the MU Extension Center in Barton County, (417) 682-3579.
Links to other resources:
VIDEO: A video about scouting for Armyworms can be viewed at:
"Crop Nutrient Deficiencies and Toxicities"
"Managing Nitrogen in Wet and Dry Years" by Peter Scharf:
MU Extension Corn Insect Pests Diagnostic guide
MU Extension publication G7112, Black cutworm guide
Corn Freeze Damage (PDF)
Spring Freeze Injury (PDF)
Frost Freeze to corn and soybeans (PDF)
2013 Pest Management Guide
Current soil temperatures in Lamar are updated every 5 minutes and can be found at http://agebb.missouri.edu/weather/realtime/lamar.asp