C.O.R.N. Newsletter

  1. Author(s): Peter Thomison

    Rainfall was mixed across Ohio over the past weekend. Although some areas of SW Ohio missed appreciable rainfall, many fields in NE and NW Ohio received up to 3 to 4 inches of rain resulting in localized ponding. If ponding and flooding was of a limited duration, i.e. the water drained off quickly within a few hours, the injury resulting from the saturated soil conditions should be minimal.

    Issue: 2015-15
  2. Author(s): Mark Loux

    While a variety of rainfall and soil moisture conditions can be found around Ohio, a shortage of rain following application of residual herbicides seems to be common.  We are hearing about weeds emerging early in the season even where residual herbicides were applied, which is an indicator of inadequate herbicide “activation”, or lack of downward movement into the upper inch or two of soil where weed seeds germinate.

    Issue: 2015-14
  3. Corn leafing out underground
    Author(s): Peter Thomison , Author(s): Pierce Paul , Author(s): Andy Michel

    According to the USDA/NASS (http://www.nass.usda.gov/) for the week ending May 24, corn was 87 percent planted, which was 21 percent ahead of last year and 17 percent ahead of the five-year average. Across the state, corn is at a range of growth stages. Some of the corn planted in early May is showing up to three leaf collars but in later planted fields, corn is still emerging. 

    Issue: 2015-14
  4. Purple Corn (Source: Glen Arnold, Putnam Co. 2012)
    Author(s): Robert Mullen , Author(s): Steve Culman , Author(s): Peter Thomison

    Corn seedlings often turn yellow (due to low nitrogen uptake and/or limited chlorophyll synthesis) or purple (reduced root development) under cool, wet conditions. Some hybrids are more likely to increase anthocyanin (purple pigment) content when plants are cool. Yellowing or purpling of corn plants at this stage of development generally has little or no effect on later crop performance or yield potential. If it's induced by environmental conditions, the yellow or purple appearance should change to a healthy green after a few sunny days with temperatures above 70 degrees F.

    Issue: 2015-14
  5. Author(s): Andy Michel

    For a couple of weeks we have been warning about the possibility of black cutworms based on adult catches reported by surrounding states.  We have begun to observe some minor feeding on corn, suggesting that the larvae are there and the worst of the damage is yet to come.  We have also received some reports of slug feeding—this is no surprise given the amount of early season rain as well as the more recent precipitation over the weekend.  As our crops are starting to emerge, these are prime sources of food for hungry cutworms and slugs.

    Issue: 2015-13
  6. Corkscrewed Corn
    Author(s): Peter Thomison

    Although corn stands are looking remarkably good across the state according to most observers, there are some localized reports of growers considering replanting. Most of these replant issues appear related to the consequences of planting in wet soils. 

    Issue: 2015-13
  7. Cutworm damage on corn
    Author(s): Andy Michel

    Reports of black cutworm and armyworms catches are still coming in from surrounding states. The big concern over the next few weeks will be egg hatch and larval growth. Both hatch and growth is difficult to predict and is largely based on temperature and growing degree days. From the temperature outlook, we should see 3rd or 4th instars of black cutworm by the 2nd or 3rd week of May, weather dependent.

    Issue: 2015-10
  8. Black cutworm moths
    Author(s): Andy Michel

    Last week, both Purdue University and the University of Kentucky reported high black cutworm catches. In addition, UKY caught a large number of armyworms in one of their traps.  Both of these moth species migrate into our area, lay eggs, and the developing larvae can be significant pests of corn and wheat.

    Issue: 2015-09
  9. The six soil regions sampled
    Author(s): Pierce Paul , Author(s): Terry Niblack

    Editor's note: Abasola Simon is also an author on this article.

    A total 425 corn fields were surveyed for plant-parasitic nematodes during the 2013 and 2014 growing seasons. In each year, soil samples were collected from 15-16 fields in each of 28 counties, across 6 soil regions, and nematodes were identified and counted.

    Issue: 2015-09
  10. Author(s): Peter Thomison

    Mistakes made during crop establishment are usually irreversible, and can put a "ceiling" on a crop's yield potential before the plants have even emerged. The following are some proven practices that will help get a corn crop off to a good start.

    Issue: 2015-08