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 2016 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.
2016 Crop Scouting Enrollment Form (PDF)
Current weekly report
September 14 - Green Stinkbug and Velvetbean Caterpillar in soybeans
Jill Scheidt, agronomy specialist with University of Missouri Extension, scouted soybeans near Mindenmines, west of Ash Grove and north of Miller on Sept. 14
Scheidt observed soybeans in the seed development stage; some fields were close to full seed.
“There were a lot of pods on the plants in all the fields that were checked. Some fields had around 20% defoliation, but fields in Barton County had 7-10% defoliation,” said Scheidt. The threshold for any foliage feeding insect is 20% defoliation during or after bloom. Scheidt observed the following foliage feeding insects: grasshopper, cloverworm, soybean looper and Velvetbean caterpillar. Velvetbean caterpillar are voracious foliage feeders, according to University of Florida, they feed on the upper foliage first then move to lower foliage and lastly the middle foliage, feeding on tender leaf material and avoiding the veins. According to Gus Lorenz, University of Arkansas Extension entomologist, during the last instar, Velvetbean caterpillar consume 90% of their life’s diet. The last instar can be identified by a light green caterpillar with a white longitudinal stripe running the length of the body, four prolegs at the middle of the body, with the first 2 prolegs being smaller than the last two.
Picture of pod worm, soybean looper, green clover worm and fall army worm differences.
Scheidt observed green stinkbugs at threshold level, which is 1 per foot of row, in most fields. Green stinkbug cause delayed maturity which causes harvest difficulties from uneven maturation across the field. They can cause reduced seed quality and quantity too.” Green stinkbugs have a needle-like mouth part which they insert into the leaves, stem and seed to suck out plant fluids, so their feeding is difficult to identify,” said Scheidt. Young seeds can be deformed, undersized or even aborted, whereas older seeds will be discolored and shriveled. The germination rate also will be reduced for beans produced as a seed source. According to Gus Lorenz, University of Arkansas Extension entomologist, seed size has a direct correlation with yield, so if seed size is reduced by 10%, yield is reduced by 10%.
University of Florida velvetbean caterpillar information.
The weekly field scouting report is sponsored by University of Missouri and Barton County Extension. For more information on the scouting report, or to learn how to receive the information earlier by telephone, contact the Barton County Extension Center at (417) 682-3579.
Links to other resources:
"Estimating Corn Grain Yield prior to Harvest" (Purdue University)
Tiller population in wheat
Scouting for Podworms in soybeans
Scouting for Corn Earworms in corn
Scouting for Armyworms in wheat
Current soil temperatures in Lamar are updated every five minutes and can be found at http://agebb.missouri.edu/weather/realtime/lamar.asp.