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.
Current monthly report
November 2014 -
Late season rains slow harvest, could cause disease
PDF | Audio
Phomopsis seed rot occurs when harvest is delayed due to rainy, wet weather or when soybeans mature during wet weather and harvest is delayed. Seed infection may reduce seed quality, vigor, and viability. Severely diseased seeds appear moldy, may be graded lower and docked at the elevator.
Symptoms of Phomopsis seed rot, pod and stem blight are apparent after the plants reach maturity. Dead petioles, stems, and pods may be covered with small black specks, which are the fruiting bodies of the fungus (pycnidia). The pycnidia are parallel along the stem, usually on the lower portion, or scattered on pods and. Affected seeds are usually cracked, shriveled, and covered with white mold. Severely infected seeds rarely germinate when planted.
Phomopsis-Diaporthe fungi overwinter as pycnidia on previously infected soybean residue. Pods may become infected at any time, but most seed infection occurs after the yellow pod stage (R7). Prolonged wet periods after flowering and pod set favor the infection and development of pod and stem blight. As pods mature, the fungus grows from the wall of the pod to the seed. Seed infection is greatly increased if harvesting of the crop is delayed during warm wet weather.
Management of Pod and Stem Blight and Phomopsis
1. Harvest when seed reaches 13%–16% moisture regardless of stem conditions
2. Rotation with wheat or corn
4. Fungicides applied to pods at midflowering to late pod stage may reduce incidence of disease
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.
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.
To receive the 2014 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.
Links to other resources:
Measuring and Reducing Corn Havest losses
Crop Nutrient Deficiencies and Toxicities (PDF)
Managing Nitrogen in Wet and Dry Years (PDF) 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