Corn Newsletter : 2018-31

  1. Plan Your Visit to Farm Science Review

    If you will be joining us at Farm Science Review this week, tune into Episode 10 of the Agronomy and Farm Management Podcast. We talked to different members of the Extension Farm Science Review planning committee about what is going on this year. Nick Zachrich addresses the expansion of the exhibit area, some new features and exhibits and even some tricks on how to make the commute a little easier. Nate Douridas talks about the crops and field demonstrations. Trey Colley goes into a little more detail on one field demonstration specifically, the Ag Innovations Demonstration which focuses on precision agriculture technology. Mary Griffith shares what attendees can see and learn at the Gwynne Conservation Area, and Harold Watters discusses what is featured in the Agronomic Crops Demonstration Plots area.

    We also discuss a few more educational exhibits, demonstrations and talks where a wealth of information related to all aspects of farming and farm life can be gained. Farm Science Review is unique in the farm show circuit because it is part of a University and able to provide an abundance of educational opportunities for visitors. Listen and subscribe at: or

  2. Preparation of Grain Bins for Storage of Corn and Soybeans

    Empty Bin Treatments for Grain Bins for Storage of Corn, Popcorn and Soybeans

    First - before using any product to treat grain bins, always read the most current label for the product to assure that the product is used correctly.  This is for the protection of the grain to be stored in the bin as well as for the protection of the applicator of the product.  Labels for products are subject to change from one year to the next, product registrations can be changed and/or canceled and rates may be changed.  Errors made because of not reading the most current label could result in injury to the applicator or contamination of the grain with a non-labeled product making it unsalable.

    Bins with perforated aeration floors (a.k.a. "false floors")

    If a bin has had a known insect problem in the recent past where a residual population of the insect(s) could be hidden under the perforated aeration floor, fumigation might be the only option to destroy these hidden insects.  The most likely product to be used for this purpose is aluminum phosphide (phosphine gas) which is sold under a number of different trade names such as Phostoxin, Fumitoxin and Weevil-Cide.  When determining the proper dosage for treating the empty bin, one has to remember that the dosage is based on the total volume of the area into which the fumigant is being released.

    There are several precautions to be addressed when using aluminum phosphide as a fumigant:

    1. The phosphine gas released by aluminum phosphide is only slightly heavier than air and will sink through a perforated aeration floor into the void below; however any air flow that is allowed to pass through the grain bin will easily carry off the phosphine gas from the intended target area.  Thus, to accomplish a successful fumigation of the volume of the targeted area within the bin, the area must be completed sealed!  If one is not willing to put forth the effort to properly seal the structure, don't use this product!
    2. The entire empty bin does not need to be fumigated if the true target is below the perforated aeration floor.  Plastic sheeting sealed around the walls can be used to restrict the gas below the floor.
    3. Phosphine gas is a highly toxic compound and must be handled with care following all safety requirements listed on the label and in the applicator's manual.  Phosphine gas is a colorless, odorless compound.  For safety purposes, the manufacturer of aluminum phosphide includes an indicator compound to warm persons of the potential presence of phosphine gas.  The indicator compound is described as smelling like garlic, fish or carbide.  If a person smells this indicator compound, they should leave the area immediately.  Unfortunately, a person's sense of smell will become accustom to the odor very quickly and be undetectable.  Thus, absence of the odor does not mean safety.
    4. The aluminum phosphide label and applicator's manual have gone through major revisions recently.  Thus, one must read both very closely to use this product correctly.

    Interior Bin Surface Treatments     

    There are very few products left registered for use around and on stored grains.  Thus, the list is short.  For corn and popcorn bins, products registered for interior surfaces of empty storage bins include:

    Tempo SC Ultra (a.i. is cyfluthrin) used as a liquid spray

    Centynal (a.i. is deltamethrin) used as a liquid spray

    Pyronyl (a.i. is pyrethrin) used as a liquid spray

    Diacon-D IGR (a.i. is s-methoprene) used as a dust application

    Insecto (a.i. is diatomaceous earth) used as a dust application

    For soybean bins, products registered for interior surfaces of empty storage bins include:

    Tempo SC Ultra (a.i. is cyfluthrin) used as a liquid spray

    Diacon-D IGR (a.i. is s-methoprene) used as a dust application

    Insecto (a.i. is diatomaceous earth) used as a dust application

    Prior to using any of these products, the first step to bin preparation for the upcoming storage is sanitation, sanitation, sanitation.  Everything that comes into contact with the grain should be cleaned thoroughly to remove all old grains that could potentially be harboring insect infestations.  These items include, but are not limited to: grain carts, wagons and trucks, combines, combine heads, augers, grain dumps and pits, grain legs, grain driers, and bins (inside and outside).  Any spilled grain should be removed.  Old seed and feed sacks should be disposed of.  Any bin that is to be used for this upcoming harvest season should be empty.  Never place new grain on top of old grain.

  3. Warmer and Wetter Pattern to Impact Much of the Harvest Season

    Author(s): Jim Noel

    The warmer pattern will continue at least into the start of October across Ohio.

    The remnants of Florence went mainly east of Ohio with only light rainfall amounts. Temperatures will heat back up into the 80s for much of the rest of this week. Normal highs are in the 70s and lows in the 50s. We expect highs this week mostly in the 80s and lows in the 60s to near 70.

    The next rainfall system will move across the region later Friday or this weekend. Another system will move through by the middle or the end of next week.

    Overall, we expect rain systems every 3-7 days until further notice. There will be dry periods mixed in as well so this will not be a continuous wet period by any means.

    The wetter pattern may cause some delays in the fields over the next 30-60 days so it will be important to take advantage of those dry stretches.

    The first freeze is nowhere to be seen. We expect a normal first freeze in the October 10-20 range for most places.

    Over the next two weeks, rainfall will average 1-3 inches with isolated 4+.

    Precipitation forecast.

  4. Sprouting Soybeans

    Author(s): Laura Lindsey

    We’ve received a few pictures from around the state of green soybean pods splitting and also seed sprouting out of pods. While it is not uncommon to see pre-harvest pod shatter just prior to harvest due to re-wetting of dry pods, the pictures we’ve received have been of soybeans at the R6 growth stage.  Soybean sprouting. Photo credit: Amanda Douridas

    Splitting of green pods may be related to the recent warm, wet (high intensity rainfall), and humid weather. (The Western Agricultural Research Station in Clark County had a high temperature of ≥93°F over a three day period in September followed by 3.5 inches of rain in a four day period.) Wet conditions at the R6 growth stage results in a large seed size that may split pods. Once the soybean pod is open, the seed is susceptible to pre-harvest sprout (germination of seed in the pod prior to harvest). Researchers have found differences in pre-harvest sprout among soybean cultivars.

    Another (potential) cause of pre-harvest sprout is insect feeding. Feeding may open the pod where moisture can enter and sprout the seed.
    Pod splitting. Photo credit: Ohio Farmer.










    Dougherty, R.W., and H.R. Boerma. 1984. Genotypic variation for resistance to preharvest sprouting in soybean. Crop Sci. 24:683-686.

    Holshouser, D. 2015. Wet conditions may lead to soybean seed sprouting. Virginia Ag Pest and Crop Advisory. Available at:

  5. Late Season Insect Considerations in Soybean

    Although the growing season is winding down, we are still receiving some reports of insect activity and damage in soybeans.  At this point, the risk is mainly to late-planted or double-cropped beans that are still maturing and still green when other fields are yellowing.  Late-season soybean aphids, which feed on sap, do not cause yield drag after seed fill is complete.  Stink bugs, grasshoppers, Mexican bean beetles, and bean leaf beetles can feed on pods later in the season.  

    Stink bugs feed directly on seeds by using their straw-like mouthparts to punch through the pod wall and suck seed contents.  Earlier in seed development, this results in shriveled or aborted seeds.  Later, feeding on more developed seeds causes only minor shriveling but can cause seed discoloration and open the pod up to disease.  Heavy late-season feeding by stink bugs is more likely to affect seed quality than yield and is more of a concern for seed-beans.  Feeding can also cause a “stay green” effect where affected plants mature later.  This is most likely to be observed on field edges where stink bug feeding is usually heavier. Stink bugs do not affect beans after full seed maturity.  Grasshoppers and beetles can chew on pods, either damaging the seed directly or encouraging disease until plant yellowing and full seed maturity. 

    Treatment is justified if the percent pod injury (counted on the whole plant, on the majority of plants examined) is approaching 10 to 15% (or 5% for seed-grade beans), insects are still present and active, and the field is not close to maturity.  As harvest approaches, the pre-harvest interval (PHI) of insecticides is an important consideration.  Most products labeled for these pests have a PHI ranging from 14-30 days, with the majority falling between 21-30 days – a consideration for harvest schedules.

    For more information about stink bugs and bean leaf beetles in soybeans visit our publications at:


  6. Results from Ohio Survey of Slug/Vole injury to Field Crops 2017-2018

    We have heard varying reports of crop injury including replanting, treatment with control products or tillage from slugs and vole in corn and soybeans across the state. To get a better feel for where and under what conditions these two pests have been active in 2017 and 2018, a short six questions survey was made available in August of 2018 on the Crop Observation and Recommendation Network website. Responses were received from 39 farmers and 8 professionals who represented 32 counties. 

    Slug injury was reported affecting 12,367 acres in 2017 and 1,606 acres in 2018. Voles were reported affecting 4,142 acres in 2017 and 3,315 in 2018. One professional reported 10,000 acres for 2017 and 20,000 in 2018 for both slugs and voles. The type of management approach was more aggressive for slugs than voles. Table one highlights management response differences.

    Table 1. Responses to question: “What management approach did you take for voles and slugs in 2017 and 2018?”

    Choices (participants could select multiple responses)



    Identified the problem, no further steps were taken



    Plant populations were reduced and I replanted the area



    A product was applied for control



    Tillage followed by replanting






    An open ended question to describe the field’s situation where the issue was most prevalent was answered by most respondents. For slugs, common words were heavy residue, saturated conditions, and cover crops, with the most injury occurring on soybeans. For voles, injury generally occurred in early planted soybeans with cover crops (with cereal rye mentioned most often) and no-till.

    We will do follow-up on monitoring and other recommendations for these pests in future articles.

  7. It’s almost that time of year … Don’t forget to calibrate your yield monitor!

    Author(s): John Barker

    HarvestRemember the old adage … Garbage in = Garbage out.  Many of us use our yield data to make additional management decisions on our farms such as hybrid or variety selection, fertilizer applications, marketing, etc.  Data from an uncalibrated yield monitor can haunt us for many years by leading us into improper decisions with lasting financial affects.  In today’s Ag economy we can ill afford any decision with adverse financial implications.

    The two biggest reasons I usually hear for not calibrating a yield monitor are 1) I just don’t have time to do it or 2) I can’t remember how to do it without getting my manual out.  While I know it’s easy to criticize from “the cheap seats,” I would argue that this could be some of the most important time you spend in your farming operation each year.  Like many other tasks on Monitoring yieldour farm, the more we do it, the easier it gets.

    Yield monitor data has so much value!  This data provides a summary (in term of yield) of every single decision you made on your farm during the past year.



    Below is a calibration checklist created by Dr. John Fulton and Dr. Elizabeth Hawkins.

    Prior to Harvest

    • Back up data from the previous season, if not already completed.
      • Best practices:
        • Copy each season’s data to a unique folder labeled as the year and yield data.
        • Maintain several backup copies of the display/raw data in different locations in case it is lost, stolen, damaged, or modified.
        • Delete old files from the memory card or USB drive.
        • Delete old files from display memory if close to full.
    • Check any data cards or USB drives to be sure they work properly with your display.
    • Contact your local dealer or manufacturer to make sure that you have the most recent software and firmware upgrades for your yield monitoring and mapping system, the display, DGPS receiver, and other components. You can obtain information about these upgrades through your manufacturer’s website or by contacting technical support.
    • Check all cables, connections, and sensors for wear or damage. Ensure that wiring and harness connections are tight.
    • For clean grain elevator-mounted moisture sensor units:
      • Make sure the sensor is clean and not damaged.
      • Clear the clean grain elevator of old grain and debris.
      • Check to be sure the manual clean-out motor works on the moisture sensor.
    • Inspect the yield sensor:
      • For combines with a mass flow sensor (normally located at the top of the clean grain elevator):
        • Look for wear on the flow sensor’s impact or deflector plate and replace the plate if worn or damaged. There have been cases where a hole in the plate exists, greatly increasing the risk of inaccurate yield readings.
        • Look for any excessive wear on the grain elevator and missing or worn paddles.
        • Check to make sure that the spacing between the paddles and the top of the elevator meets the manufacturer’s requirements.
        • Ensure the clean grain elevator chain is tightened to manufacturer specifications.
      • For combines with an optical sensor (mounted on the side of the clean grain elevator):
        • Make sure the sensors are clean and not damaged.
        • Ensure the clean grain elevator paddles are not rubbing against sensors.
    • If you purchase a new or used combine with an existing yield monitor installed, double check to make sure it is installed properly. Especially check that the mass flow sensor is mounted securely.
    • If a grain cart with scales or a weigh wagon is used to weigh grain harvested for yield monitor calibration loads, double check that they are producing accurate weight data. Check weigh wagon weights against certified scales each season to ensure the load estimates are within a few percent and use the same scales throughout calibration.
    • Avoid running electrical wires next to the GPS antenna which may cause interference with the receiver signal. Running wires perpendicular to each other decreases the chance for electrical noise that may occur from other electronics.
    • The calibration operation will require accurate estimates of moisture content of the harvested grain. Portable moisture meters commonly used on the farm vary widely in terms of their estimate accuracy. If you are not certain of the accuracy of your grain moisture meter, take it to a local grain elevator that has a federally approved moisture meter and compare estimates on grain samples, preferably samples representing a wide range of grain moisture, e.g., 13 to 28 percent grain moisture content.
      • Document differences between your meter and the meter known to be accurate. As an example:
        • Your meter estimates 25 percent; accurate meter estimates 28 percent.
        • Your meter estimates 20 percent; accurate meter estimates 22 percent.
        • Your meter estimates 15 percent; accurate meter estimates 16 percent.
      • During the yield monitor calibration operation, use the documented moisture estimate differences to adjust the estimates of moisture made on grain sampled from the harvested calibration loads.
      • It is still recommended to always check moisture content estimates with a federally-approved moisture meter.

    During Operation, Prior To Calibration

    • Start up combine and turn on the yield monitor display to check the following:
      • Display indicates everything is functioning correctly or is properly connected.
      • Memory card or USB drive is installed properly, if required.
        • Make sure there is proper communication between the data card and the in-cab display for those displays requiring a memory card to collect data; mostly older displays such as the Ag Leader PF series display. Usually an error message will appear on the display indicating there is no communication with the card.
      • DGPS receiver is providing a position and has differential correction (WAAS, SF1, SF2, RTX, or RTK).
        • Note: If purchasing a differential correction service, make sure your subscription runs through harvest.
    • Check and set header switch for starting and stopping of data collection.
      • Raise and lower the header to make sure the stop-height switch operates properly.
      • Automatic On/Off using the switch: Most yield monitors will step through the electronical setting of the start (header down position) and stop (header up position) positions for the switch during initial calibration. However, you may want to check annually or change when moving between corn and platform headers since these are operated at different heights.
      • Manual On/Off: Some yield monitors are equipped with a manual button that turns on and off data collection through the in-cab display. You may have to adjust the header height switch to accommodate the preferences of different operators during harvest.
    • Set row width according to number of rows for a row crop header or the appropriate width of a cutting platform header.
      • Some yield monitors have the option to use automatic swath width detection to adjust the swath width when overlap is detected. This feature can be helpful when harvesting point rows or near field edges; however, be aware it may not function properly if your DGPS source has a potential for large positional error (e.g. WAAS) or if there is signal interference or loss.
    • Engage the separator and observe the elevator speed on the in-cab display to make sure the shaft sensor is operating correctly. The clean grain elevator speed (e.g. RPM) is used as feedback for computing the yield estimate since speed controls the frequency of which grain from the elevator paddles impact the mass flow sensor.


    The yield estimate produced by a yield monitor is calculated from estimates made by multiple sensors. Each of these sensors must be calibrated in order for the yield estimate to be accurate. Consult your user manual to determine the sequence in which these calibrations should take place.

    Mass-Flow Sensor Vibration Calibration

    This calibration is used to document the effect of vibration when the combine is running. Follow the directions in your user manual to complete the vibration calibration. Be sure that:

    • The proper header is attached and in operating position (not resting on ground).
    • The combine is empty of grain.
    • The separator and header are engaged.
    • The combine is running at full RPM.

    Temperature Calibration 

    This calibration ensures accuracy of the grain moisture estimates made by the moisture sensor in the clean grain elevator. Most manufacturers suggest this calibration only be performed once at the beginning of the season.

    • Perform this calibration when the combine has been sitting for several hours and preferably in a shaded area. Ensure the combine and moisture sensors are empty of grain.
    • Estimate the air temperature using an accurate thermometer.
    • Adjust the temperature value reported by the display according to the user manual.
      • Some displays require you to simply enter the temperature reading from the thermometer, others require you to enter an offset value (usually the difference between the thermometer reading and the sensor reading).

    Moisture Sensor “Calibration”

    This “calibration” is necessary to ensure that the moisture sensor in the clean grain elevator accurately estimates grain moisture content, which in turn is used by the display to calculate “dry” grain yield based on the “dry” moisture value of your choice. The process is not a true calibration because it is based on a single comparison of the display’s estimate of grain moisture from a harvested load, with that estimated from a small sample of grain collected during the off-loading of grain to the wagon, grain cart, or truck.

    • Some manufacturers suggest that moisture “calibration” need only be performed once during the harvest season. Our experience suggests that the accuracy of a moisture sensor can change throughout the season as harvest grain moisture levels change. Check the accuracy of moisture sensor estimates routinely during the season.
      • Be aware that yield monitor displays differ in how they handle changes in grain moisture “calibration.” Some apply changes retroactively to previously harvested grain and others apply changes only to future harvested grain.
    • Reset the moisture offset in the display to zero.
    • Randomly collect grain from each calibration load to obtain a representative sample.
    • Measure the moisture of the grain samples with an accurate grain moisture meter.
    • Enter the difference between the display moisture estimate and the grain sample estimate into the display according to your user manual.
    • Repeat this calibration for each type of grain harvested.

    Ground Speed Calibration

    Many yield monitors today use GPS to determine ground speed, therefore there is no need for a ground speed calibration. If a mechanical speed sensor is being used as a backup, it should be calibrated. These calibrations are conducted by travelling a known distance through the field and timing how long it takes. When calibrating the ground speed sensor, use typical field conditions rather than a road or waterway. Tire slippage can create inaccuracy with calibration.

    Mass Flow Sensor (Weight) Calibration

    Proper calibration of the mass flow sensor is crucial to the accuracy of grain flow estimates and, ultimately, the yield estimates. The weight calibration process basically involves harvesting individual loads of grain and verifying the actual weight of the harvested grain with accurate scales. The actual weights of the individual loads are manually entered into the calibration screen of the display. Built-in software procedures then calibrate the display’s weight estimates to best match the scale’s estimates. Display manuals often suggest that calibration errors can be minimized to 5 percent or less. If best management calibration practices are followed, most modern displays can easily be calibrated to 1 percent error or less.

    There are two common approaches used for calibration: a near-linear calibration and a non-linear calibration.

    • Near-linear calibrations require one or two calibration loads to generate a calibration line.
      • Many older yield monitors (primarily GreenStar™ displays prior to the S-series combines) use near-linear calibrations.
      • The Precision Planting YieldSense™ system typically requires a single load calibration procedure. It also provides an optional “True Up” feature for tweaking calibration accuracy later in harvest. Of note, the YieldSense™ Grain Property Kit that replaces one of the paddles on the clean grain elevator allows continuous adjustments of the calibration as grain conditions (e.g., test weight) vary.
    • Non-linear calibrations require four or more calibration loads that represent a range of anticipated grain flow rates to generate a calibration curve.
      • Use the number of calibration loads recommended by the manufacturer (commonly four to six calibration loads).

    Regardless of the calibration method, the quality of the calibration loads is important. The following best practices can help ensure the calibration is accurate.

    • Calibration loads should be representative of the different grain flow rates (pounds per second or bushels per hour) that will be encountered. It is important to take the time to calibrate the mass flow or volumetric sensors over the full range of expected loads. Note that older GreenStar™ and the Precision Planting YieldSense™ systems follow a different process but regardless, it is good to understand this section.
      • Harvest calibration loads at different flow rates (low to high). The goal is to have each load harvested at a constant and consistent flow rate. Target flow rates can be achieved by:
        • harvesting each load with a full header at different speeds.
        • harvesting each load at a constant speed with different harvested swath widths.
    • When harvesting calibration loads, it is recommended to use loads between 3,000 to 8,000 pounds for most yield monitors. Precision Planting’s YieldSense™ manual does recommend 25,000-pound calibration loads or three 10,000-pound loads. This helps reduce the overall sensor error while calibrating.
    • Avoid starting calibration loads on turn rows, weed patches, or areas of major topography changes in the field.
      • Hillsides and rolling ground can impact calibration load data because of changes in how grain impacts the flow sensor.
      • If you are unable to avoid topographical changes make sure you get a good representation of loads going up- and downhill and side-to-side of a hill.
    • It is necessary to calibrate for each type of grain for each year.
      • Flow rates tend to be much higher when harvesting corn compared to soybeans or wheat.
      • Other grain characteristics that vary between different grain types can alter the reading produced by the mass flow sensor.
      • The dynamics of grain flow through a combine changes with wear and tear.
    • When conducting on-farm research trials or harvesting fields with multiple varieties, consider paying attention to large differences in moisture content; a two to three point swing in test weight between varieties. Again, having calibration curves for high and low moisture or high and low test weight will help collect quality data. Of note, the Precision Planting Grain Property Kit can help adjust yield estimates for swings in test weight within the YieldSense™ monitor.
      • For example, calibrate for regular corn and high oil corn separately due to the differences in test weight and moisture characteristics of the grain.
    • Calibrate for different moisture levels per type of grain.
      • For example, calibrate differently for corn below 20 percent moisture versus corn above 20 percent moisture.

    During Harvest

    • Take good notes on field and operating conditions during harvest. This information will be helpful when reviewing yield maps after harvest. Capturing images with your smartphone, iPad, or similar device can be a simple way of collecting visual notes.
    • Correct any malfunctions or errors indicated by the yield monitor, including loss of DGPS signal. Make sure the display is actually collecting data. Sometimes one can manually switch off data collection on the display and forget to turn it back on for older model yield monitors.
    • Remove your memory card or USB drive from the display when not in use and back up data onto your computer and data storage devices frequently throughout the harvest season. A simple electrical shock from improper wiring or lightning can destroy data.
    • It is wise to perform periodic calibration loads throughout a lengthy harvest season to check or improve accuracy of the weight estimates. It is suggested to recalibrate if you observe:
      • more than a 5 percent difference in weight calibration errors,
      • 5 pound per bushel differences in grain test weight, or
      • temperature changes greater than 10 degrees.
    • Be sure to recalibrate after replacing yield monitor components or if changes are made to the elevator chain, paddles, or flow sensor during harvest.
      • Tightening the elevator chain, replacing old paddles, or changing the distance between the flow sensor and paddles changes the accuracy of the previous calibration.
    • If you run into problems with the monitoring equipment during harvest, check the troubleshooting information in the operator’s manual. Contact technical support if you are unable to solve the issue.
    • The use of telemetry or wireless data transfer offers the ability to transfer data automatically from the in-cab display to the “cloud.” Every OEM along with third party companies offer wireless data transfer technology improving the ability to seamlessly transfer data to the “cloud” providing backup for your data along with the ability to access online.


  8. Pesticide and Fertilizer Applicator Recertification Credits and CCA CEUs Available at Farm Science Review

    By The Agronomic Crops Team

    Are you a licensed pesticide or fertilizer applicator or Certified Crop Advisor and will be attending the 2018 Farm Science Review this week? Several talks will be given by the Agronomic Crops Team that qualify for pesticide and fertilizer applicator recertification credits or CCA CEUs. Topics to be covered include Herbicide Mode of Action, New Tri-State Fertilizer Recommendations, Grid Soil Sampling, and Phosphorus Index Tool. The schedule for these talks is below. Additional walk and talk presentations that qualify for CCA CUEs will be offered by request from 9 AM – 12 PM each day of the show. More details and a map of the demonstration area can be found on page 8 of the 2018 Farm Science Review program. Even if you aren’t looking for credits, take time to stop by and chat with OSU Extension Agronomic Crops Team members from around the state and sign up for chances to win great giveaways like a Cabela’s cooler!


About the C.O.R.N. Newsletter

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.


Amanda Bennett (Miami County)
Andy Michel (State Specialist, Entomology)
Debbie Brown, CCA (Shelby County)
Dennis Riethman (Mercer County)
Eric Richer, CCA (Fulton County)
Garth Ruff (Henry County)
Glen Arnold, CCA (Field Specialist, Manure Nutrient Management )
Greg LaBarge, CPAg/CCA (Field Specialist, Agronomic Systems)
Harold Watters, CPAg/CCA (Field Specialist, Agronomic Systems)
Jeff Stachler (Auglaize County)
Jim Noel (National Weather Service)
John Schoenhals, CCA (Williams County)
Kelley Tilmon (State Specialist, Field Crop Entomology)
Mark Badertscher (Hardin County)
Mike Gastier, CCA (Huron County)
Pierce Paul (State Specialist, Corn and Wheat Diseases)
Rory Lewandowski, CCA (Wayne County)
Sam Custer (Darke County)
Sarah Noggle (Paulding County)


The information presented here, along with any trade names used, is supplied with the understanding that no discrimination is intended and no endorsement is made by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

CFAES provides research and related educational programs to clientele on a nondiscriminatory basis. For more information, visit For an accessible format of this publication, visit