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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
Diseases appearing in soybeans
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 Arcola on Aug. 20 for the MU Extension crop scouting program. Scheidt offers this advice from the field.
Corn in the area is at from 75 to 100 percent black layer.
Scheidt did observe corn earworms feeding on mature kernels. “The corn earworms were moving slow and should move to other fields or end their lifecycle soon. There was not enough damage and it is too late to spray an insecticide,” said Scheidt.
Scheidt recommends a fungicide in the bin to prevent disease if a lot of kernels are damaged by corn earworm.
Soybeans are in the beginning bloom to beginning seed stages.
Scheidt observed grasshopper feeding was seen on leaves; threshold levels for foliage feeding insects are 20 percent defoliation during or after bloom. Hero, Warrior or Mustang Max are the recommended controls.
“No corn earworms were seen but should be scouted for in soybeans. They pose the biggest threat to second crop soybeans,” said Scheidt. Threshold levels are 1 per foot of row or when 5% of pods are damaged.
Septoria brown spot was seen south of Lamar. “It is too late to spray a fungicide in order to prevent or control most diseases if soybeans are past the flowering stage. Fungicide applications made after the flowering stage or once the disease is present, usually only suppress the disease,” said Scheidt. According to Laura Sweets, plant pathologist with the University of Missouri Extension, fungicides do not need to be applied unless favorable weather conditions for disease are present.
Septoria brown spot
Sudden death syndrome, or SDS, was seen in irrigated fields in Lamar. “SDS is caused by susceptible varieties and wet conditions,” said Scheidt. According to Jason Bond, plant pathologist with the University of Illinois, turning off irrigation is not a good option if soybeans are developing seeds, because the consequences of dry growing conditions without irrigation outweigh the effects of SDS. “There is no rescue treatments for SDS, selecting resistant varieties is the best control option,” said Sweets.
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 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