Corn Newsletter : 2019:18

  1. Author(s): Ben Brown, Sarah Noggle, Barry Ward

    Consistent rains across Ohio and the Corn Belt continue to delay planting progress as the June 17USDA Planting Progress report showed that 68% of intended corn acres and 50% of intended soybean acres have been planted in Ohio. Nationwide, roughly 27 million acres of corn and soybeans will either be planted or filed under prevented planting insurance. Across Ohio, the Final Plant Date (FPD) for soybeans is June 20. Soybeans can be planted after the FPD, but a one percent reduction in the insurance guarantee occurs.

  2. Author(s): Jim Noel

    Wet conditions into July will impact additional planting but also harvesting crops. This includes wheat and hay.

    There is not much change from last week's thinking. Overall, we expect above normal rainfall for the rest of June and likely into parts of July.

    Rainfall for the next two weeks will average 2-5 inches which are 100-250% of normal. Isolated totals will exceed 6 inches.

  3. Author(s): Sarah Noggle, Alan Sundermeier, CCA

    It’s been a rough spring for much of Ohio and the counties that have received the most rainfall typically have less than 20% of the county planted. Many unplanted acres remain across the Corn Belt and in Ohio. The decision to plant or not to plant still lingers in a farmer’s mind. Farmers truly want to plant but with the June 20 deadline for planting soybeans or declaring prevent plant, many farmers will be taking the prevent plant option. Additionally, on the acres not planted, weed pressure is becoming more and more of a problem.  

  4. Author(s): Alexander Lindsey, Steve Culman, Peter Thomison

    As corn is emerging and beginning to grow, we are again seeing many colors present. In any given field, corn can appear dark green in sections, while other sections are yellow and occasionally purple. Yellowing (due to low nitrogen or sulfur uptake and/or limited chlorophyll synthesis) or purpling (reduced root development and/or increased anthocyanin production) of corn plants at this stage of development generally has little or no effect on later crop performance or yield potential.

  5. Author(s): Peter Thomison

    I have received several reports of corn leaning because of the high winds we have experienced recently along with the heavy rains. It is not uncommon for young plants to exhibit “lodging” as a result of strong winds. Last week, Amanda Douridas, ANR Extension Educator in Champaign Co., shared observations of corn leaning at approximately the V3-V6 stage in several fields (see Fig. 1). Usually, this leaning is short-lived and plants recover within several days. Amanda reported that about 24 hours after the wind event the plants had already straightened up.

  6. Author(s): Anne Dorrance

    Let me say upfront that much of the information in this piece is based on a study published (Crop Science 53:1086-1095 in 2013) by Dr. Susan Goggi’s lab and others at Iowa State University, Dept. of Agronomy & Seed Science Center.

  7. Author(s): Anne Dorrance

    Several pictures last week and over the weekend of leaves with tan centers and purple to burgundy ring around the outside.  These are symptoms of both some types of herbicide injury but frogeye leaf spot as well.  With frogeye, conidia will form on the underside of the lesion.  One of the ways to visualize them is to place the leaves in a plastic bag overnight and look for “whiskers” (the conidia) on the underside of the lesion the next morning (Figure).  Leaves are often damp enough so a wet paper towel is not needed for this, if the leaves have become dry, just rinse them off with tap wat

  8. Author(s): Steve Culman

    NZone MaxTM is a commercial product by AgExplore International, LLC® (Parma, MO) designed to improve N efficiency by maintaining N in the ammonium form (NH4), slowing the conversion to nitrate (NO3). NZone Max is not a traditional nitrification inhibitor, but rather uses unique calcium-based chemistry to slow the conversion of NH4 into NO3.

  9. Author(s): Kelley Tilmon, Andy Michel, Mark Sulc

    Some alfalfa fields have been harvested for the first time and now is the time to scout the regrowth in those fields for potato leafhoppers (PLH).  At our Western Agricultural Research Center near South Charleston, OH the PLH numbers last week in early alfalfa regrowth were generally about half the number needed to reach economic treatment thresholds. However, PLH populations can change quickly, and second crop regrowth should be scouted at least on a weekly basis.

  10. Author(s): Laura Lindsey, Pierce Paul

    Wheat harvest date impacts both grain yield and quality. Delaying wheat harvest puts the crop at risk for increased disease, vomitoxin contamination, lodging, sprouting, and harvest loss.

    With funding from the Ohio Small Grains Marketing Program, we conducted wheat harvest date trials for three years. However, none of the years were similar to what we are experiencing this year.

  11. Author(s): Amanda Douridas

    The Agronomy and Farm Management Podcast has been releasing new episodes every other week since May 2018 and is set to release its 29th episode next Wednesday. To make it easier for listeners to find past episodes, the podcast has a new landing page at

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.

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