Corn Newsletter : 2016-11

  1. Bee on dandilion
    Author(s): Reed Johnson, Doug Sponsler, Andy Michel, Kelley Tilmon

    Beekeepers in Ohio benefitted from the generally mild winter of 2015-2016.  In Columbus we lost less than 20% of our colonies over winter.  Spring is the only reliably good season for bees in Ohio.  Colonies that survived the winter and new colonies brought up from the Gulf Coast or California are currently in the process of harvesting nectar and pollen from spring-blooming trees and weeds.  Little honey will be made from this spring bounty as most will be eaten by the bees themselves as they multiply and grow into large productive colonies that will be able to make a honey crop off of clov

  2. Leaf rust
    Author(s): Pierce Paul

    Last Thursday I received reports of, and confirmed through pictures, stripe rust in southern Ohio. Reports coming in today suggest that the disease has since spread and may even be increasing in severity. This is very early for Ohio and is a cause for concern, especially since this disease develops best and spreads quickly under cool, rainy conditions, similar to what we have had over the last few weeks and will likely continue to have this week.

  3. Rain on wheat
    Author(s): Pierce Paul, Karasi Mills

    Recent reports of leaf and stripe rust and the fact that the wheat crop is approaching flowering have producers thinking about applying a fungicide to protect their crop. However, it has rained consistently over the last several days and there is more rain in the forecast for the rest of this week. In addition to increasing disease risk, frequent rainfall may reduce fungicide efficacy by washing it off of the plant surface or diluting it to a less effective concentration.

  4. Wheat Flowering
    Author(s): Pierce Paul, Jorge David Salgado

    Wheat is now heading out in some fields, particularly in Southern Ohio, and will likely begin flowering in various parts of the state over the next two to three weeks. On average, it usually takes about 5 days from full head emergence (Feekes 10.5) to flowering, and flowering is usually over in about the same number of days. However, flowering could take a bit longer to occur and the flowering window could be much wider under cool conditions similar to those forecasted for the next week or so. Once wheat begins to flower, scab and vomitoxin become our biggest concerns.

  5. Corn emerging
    Author(s): Peter Thomison, Steve Culman

    As of Sunday May 8, 30 percent of Ohio’s corn crop was planted, which is 14 percent behind last year and 5 percent behind the five-year average ( Weather forecasts indicate more rain this week possibly continuing through Thursday.

  6. Corn spike
    Author(s): Peter Thomison

    There have been reports of slow corn emergence in some areas and that corn planted more than three weeks ago is not yet emerging. Is this cause for concern? Not necessarily. Corn requires about 100 growing degrees days (GDDs) to emerge (emergence requirements can vary from 90 to 150 GDDs). To determine daily GDD accumulation, calculate the average daily temperature (high + low)/2 and subtract the base temperature which is 50 degrees F for corn. If the daily low temperature is above 50 degrees, and the high is 86 or less, then this calculation is performed using actual temperatures.

  7. Palmer amaranth in soybeans
    Author(s): Mark Loux

    When you finish every possible indoor task during this rainy spell, take a few minutes and check out our latest video on pigweed identification.  The video compares four aspects of pigweed biology that we use to differentiate between redroot pigweed, waterhemp, and Palmer amaranth – pubescence, petiole length, leaf shape, and inflorescence (seedhead) characteristics.  Find it at the OSU weed management website –  There are far worse ways to spend a few minutes.


  8. corn field
    Author(s): Greg LaBarge, CCA, Harold D. Watters, CPAg/CCA

    The number of individuals who have been trained for the Ohio Fertilizer Applicator Certification by Ohio State University Extension Agriculture and Natural Resources staff has reached 11,859 as of April 30, 2016. The ongoing training has generated a lot of positive response from farmers who attended. Requests have come in to make short review videos of key parts of the training available for review. The videos which range from 5 to 15 minutes in length have been posted to

  9. 4 inch soil temperature
    Author(s): Jim Noel The trend this spring has been on the warmer and wetter side except for a drier period in the last 30 days in parts of the state. The images below show departures from normal over the region the last 30, 60 and 90 days at 4 km resolution.
  10. Author(s): Greg LaBarge, CCA

    There are three excellent field day opportunities being planned for small grain producers across the state. The three days cover a variety of production issues, nutrient management practices, and small grain uses. Locations are in Pickaway, Wayne and Wood Counties. Be sure to check out the location closest to you! For detailed information visit:

    June 1, Pickaway County, On-Farm Wheat Field Day, 19076 Florence Chapel Pike, Circleville at 9 am.

About the C.O.R.N. Newsletter

C.O.R.N. is a summary of crop observations, related information, and appropriate recommendations for Ohio Crop Producers and Industry. C.O.R.N. is produced by the Ohio State University Extension Agronomy Team, State Specialists at The Ohio State University and Ohio Agricultural Research and Development Center. C.O.R.N. Questions are directed to State Specialists, Extension Associates, and Agents associated with Ohio State University Extension and the Ohio Agricultural Research and Development Center at The Ohio State University.