C.O.R.N. Newsletter

  1. Author(s): Peter Thomison

    Rainfall over the past weekend helped some drought stressed corn fields, especially late plantings, but it may have been too late for others.  Prior to this rainfall, according to the U.S. Drought Monitor, 46 percent of Ohio was rated as in “moderate drought” (https://www.nass.usda.gov/Statistics_by_State/Ohio/Publications/Crop_Progress_&_Condition/index.php). That area covered most of northern Ohio.

    Issue: 2016-25
  2. Author(s): Peter Thomison , Author(s): Laura Lindsey

    Have very dry soil conditions increased the potential for toxic levels of nitrates in corn harvested for silage? Nitrates absorbed from the soil by plant roots are normally incorporated into plant tissue as amino acids, proteins and other nitrogenous compounds. Thus, the concentration of nitrate in the plant is usually low. The primary site for converting nitrates to these products is in growing green leaves. Under unfavorable growing conditions, especially drought, this conversion process is retarded, causing nitrate to accumulate in the stalks, stems and other conductive tissue.

    Issue: 2016-25
  3. Agronomists , CCAs and custom applicators are invited to the Farm Science Review Agronomy College, hosted by the Ohio AgriBusiness Association in partnership with Ohio State University Extension and the Farm Science Review staff. The program will bring industry experts, OSU researchers, and agronomy service providers together to enhance collective knowledge and learning at the Molly Caren Agricultural Center in London, Ohio, on Sept. 13 - one week before the start of the annual three-day farm show.

    Issue: 2016-24
  4. Author(s): Peter Thomison

    Tassel Ears” (Figure 1) are showing up in corn fields around Ohio. Corn is the only major field crop characterized by separate male and female flowering structures, the tassel and ear, respectively. In most corn fields it is not unusual to find a few scattered plants with a combination tassel and ear in the same structure - a "tassel ear". The ear portion of this tassel ear structure usually contains only a limited number of kernels.

    Issue: 2016-23
  5. Author(s): Peter Thomison

    Editor's Note:  This is a synopsis of the article last week from Peter Thomison, with the pictures attached.  I've included a bit of the information to "explain" the images, but if you want "The Whole Story," please refer to last week's CORN Newsletter (2016-20).



    Issue: 2016-21
  6. Author(s): Peter Thomison

    When estimating yield losses in corn due to hail, frost, and other types of plant injury, it’s essential to establish the stage of plant growth at the time damage occurred. It’s also important to know corn stage of development in order to apply post-emergence chemicals effectively with minimum crop damage. Counting leaf collars to determine the vegetative stage is feasible until the lower leaves can no longer be identified. At about the V6 stage, increasing stalk and nodal growth combine to tear the smallest lower leaves from the plant.

    Issue: 2016-14
  7. black cutworm feeding above ground
    Author(s): Kelley Tilmon , Author(s): Andy Michel

    We have started to see cutworm damage in Ohio corn.  Black cutworm (BCW) is the prime offender, though other species exist.  Adult BCW (moths) are migrants from the south that start moving into Ohio in April, and lay eggs that hatch into the cutworm caterpillars.  Although there are some hotspots for egg laying, these predictions are far from exact.  Moths tend to seek out fields with a lot of weeds, especially winter annuals such as chickweed, to lay their eggs.

    Issue: 2016-13
  8. Replant corn decision
    Author(s): Peter Thomison

    Although most corn that’s been planted has yet to emerge or develop much beyond the VE or V1 stage, there are localized reports of growers replanting early planted corn. Some of these replant issues appear related to the consequence of recent frost injury combined with excess soil moisture or flooding.

    Issue: 2016-13
  9. frost damaged soybeans
    Author(s): Laura Lindsey , Author(s): Peter Thomison

    Soybean: Last Monday, May 16, air temperatures dropped to high 20s/low 30s causing some freeze injury to soybeans. Soybeans in low areas of the field are most likely to be affected. Plants should be assessed for damage at least five days after suspected injury to inspect for regrowth. If damage occurred above the cotyledons, the plant will likely recover. If damaged occurred below the cotyledons, the plant will not recover. Look for a discolored hypocotyl (the “crook” of the soybean that first emerges from the ground) which indicates that damage occurred below the cotyledons.

    Issue: 2016-13
  10. Author(s): Peter Thomison

    Throughout much of Ohio, cool temperatures and saturated soil conditions have delayed corn planting. According to the USDA/NASS (http://www.nass.usda.gov/), during the past week, Ohio corn acreage planted increased slowly (from 30% for the week ending May 8 to 34% for the week ending May 15). The weather forecast this week and beyond promises some relief from rain but many soggy fields will be slow to dry until temperatures increase.

    Issue: 2016-12