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Barton County Extension staff, council members and 4-H volunteers serve cake and ice cream at the Lamar Fair in celebration of MU Extension 100 years and 80 years of 4-H in Barton County.
Weekly Crop Scouting Report
Insect identification important in treatment decisions
This article is available as a PDF or Audio message.
Jill Scheidt, agronomy specialist with University of Missouri Extension in Barton County, scouted fields north of Lamar, near Irwin on Sept. 10 for the MU Extension crop scouting program. Scheidt offers this advice from the field.
Scheidt observed soybeans in the seed development and full seed stages. Grasshopper feeding was seen on pods and foliage.
“Defoliation threshold levels are 20 percent defoliation after bloom. If grasshopper or any pod feeding insects are present and 5 percent or more pods are damaged, treatment is justified,” said Scheidt.
No pod worms were seen this week. “Once soybeans are at full seed, pod worms do not prefer to feed on them,” said Scheidt.
Threshold level for pod worms in soybeans is 1 per foot or when 5 percent or more pods are damaged. “If pod feeding is old and no pod worms are present, it is likely they have moved on and it is not economical to spray an insecticide,” said Scheidt.
It is important to distinguish pod worms from green clover worm and soybean looper. Loopers and clover worms generally feed on foliage and not on seeds. Clover worms and loopers also carry a fungus that kills pod worms so they are seen as a beneficial.
Clover worms and loopers are generally bright green in color; clover worms have 3 pro-legs in the middle of their body and loopers have 2 pro-legs in the middle of their body.
Pod worms have 4 prolegs in the middle of their body and range in color; they have stripes running the length of their body and small black dots all over.
Pod worm - Soybean looper - Green clover worm differences
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:
“Scouting for Podworms in Soybeans.”
Measuring and Reducing Corn Havest Losses
Scouting for Corn Earworms in corn
Scouting for Armyworms in wheat
"Crop Nutrient Deficiency and Toxicities"
Previous 2014 Crop Scouting Reports
“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
Spring freeze injury
Frost freeze to corn and soybeans
MU Extension publication M171, 2013 Missouri Pest Management Guide
To receive the 2014 weekly scouting reports, print the 2014 Crop Scouting Enrollment Form (PDF), complete and return with payment to Barton County Extension, 801 E 12th, Lamar, MO 64759.
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.
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