C.O.R.N. Newsletter

  1. Author(s): Pierce Paul

    A few weeks ago, Tar Spot, a new disease of corn caused by the fungus Phyllachora maydis was reported for the first time in the US, first in Indiana and then in Illinois. It was later found as far east as Allen County, IN, bordering Paulding County in northwest Ohio. So, although Tar Spot has not yet been confirmed in Ohio, it is quite possible that it may be present in the northwestern corner of the state.

    Issue: 2015-32
  2. Author(s): Ed Lentz, CCA , Author(s): Steve Culman

    Fall is an excellent time to test soil pH and determine whether any lime needs to be applied for future crops. Proper soil pH is important for nutrient availability, herbicide activity, and crop development. For most soils, additional lime is not needed every year. Consider these points before liming your fields:

    Issue: 2015-32
  3. Aerial imagery of 2015 corn and soybeans
    Author(s): John Fulton

    Andrew Klopfenstein, Kaylee Port and Scott Shearer also contributed to this article

    Issue: 2015-29
  4. Author(s): Peter Thomison , Author(s): Allen Geyer

    When checking corn fields prior to and during harvest, it’s not uncommon to encounter abnormal corn ears such as those shown above (Fig. 1), especially when the crop has experienced stress conditions. Some of these abnormalities affect yield and grain quality adversely. We recently updated “Troubleshooting Abnormal Corn Ears” (available online at http://u.osu.edu/mastercorn/) to help corn growers and agricultural professionals diagnose and manage various ear and kernel anomalies and disorders.

    Issue: 2015-29
  5. Author(s): Peter Thomison

    Excessive rainfall (which contributed to N loss and poor root development) followed by late season drought had a major impact on ear and kernel formation in many Ohio corn fields this year. Poor ear and kernel development is associated with variability in plant growth within fields that is related to differences in the timing and duration of soil saturation.   In some areas within fields subject to protracted saturated soil conditions, ears are absent (“barren”) or severely reduced in size with a few scattered kernels (nubbin ears).

    Issue: 2015-29
  6. WBCW larva in corn ear
    Author(s): Andy Michel

    Over the past few weeks, we have been receiving calls, emails and texts about finding large caterpillars feeding on corn ears (see photo).  In most cases, these are turning out to be Western bean cutworms.  Although our numbers have been about the same as previous years, we may have seen slightly more survival. This may be due to the drier and milder July, as well as delayed and patchy corn maturity which provided a lot oviposition sources.

    Issue: 2015-27
  7. corn leaf disease symptoms
    Author(s): Pierce Paul

    Early development of gray leaf spot (GLS) and northern corn leaf blight (NCLB) had us all concerned about the potential for major epidemics of these diseases in 2015. However, conditions have since been warm and dry across most of the state, drastically reducing the spread of these and other foliar diseases. In fact, lesions of GLS and eye spot from early outbreaks can still be found on leaves below the ear in some fields, but in most cases they are of restricted development and the disease has not spread to the upper leaves.

    Issue: 2015-27
  8. Author(s): Peter Thomison

    This is the time during the growing season when crop tours and seed companies start posting yield predictions for corn. Most of the corn crop in Ohio is probably at the dough stage (R4). Given the tremendous variability in crop quality across the state and between and within fields, it will be particularly interesting this year see how close yield estimates come to matching what's harvested this fall. Moreover, although there may be little or no yield from many fields damaged by excessive rainfall and saturated soil conditions (and related problems, e.g.

    Issue: 2015-25
  9. Author(s): Bill Weiss , Author(s): Dianne Shoemaker

    1. Estimate grain yield using the Thomison (2013) method (see link below) or other approach.

    2. On average, in the lower Midwest, you get about 1 ton of corn silage (35% dry matter (DM)) per 7.5 to 8 bushels of corn.  Therefore, if the estimated grain yield is140 bu/acre, expected silage yield would be 140/8 = 17.5 tons.

    3. However, under abnormal growing conditions this may underestimate forage yield (i.e., there will be less than 8 bu of grain per ton). See methods in the corn silage pricing article (link below.)

    Issue: 2015-24
  10. Author(s): Peter Thomison

    According to the National Agricultural Statistics Service (http://www.nass.usda.gov/Statistics_by_State/Ohio/Publications/Crop_Progress_&_Condition/index.asp) for the week ending 7-19-15, 43% of the state’s corn was silking compared to 53% for the 5-year average. The pollination period, the flowering stage in corn, is the most critical period in the development of a corn plant from the standpoint of grain yield determination.

    Issue: 2015-22

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