C.O.R.N. Newsletter

  1. 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
  2. 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
  3. 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
  4. 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
  5. Author(s): Peter Thomison , Author(s): Allen Geyer

    Cold, wet conditions have delayed corn planting throughout Ohio. According to the USDA/NASS (http://www.nass.usda.gov/), for the week ending May 15, corn was 34 percent planted, which was 37 percent behind last year and 20 percent behind the five-year average.

    Issue: 2016-12
  6. cereal leaf beetle feeding in wheat
    Author(s): Andy Michel , Author(s): Kelley Tilmon

    With much of the state still yet to plant, growers should be keep a few insect pests in mind as they get in into fields this week:

    Issue: 2016-12
  7. 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.

    Issue: 2016-11
  8. Corn emerging
    Author(s): Peter Thomison , Author(s): 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 (https://www.nass.usda.gov/Statistics_by_State/Ohio/Publications/Crop_Progress_&_Condition/index.php). Weather forecasts indicate more rain this week possibly continuing through Thursday.

    Issue: 2016-11
  9. Bee on dandilion
    Author(s): Reed Johnson , Author(s): Doug Sponsler , Author(s): Andy Michel , Author(s): 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

    Issue: 2016-11
  10. Armyworm in Corn Whorl
    Author(s): Kelley Tilmon , Author(s): Andy Michel

    True armyworm (Pseudaletia unipuncta) overwinters in the southern U.S. and adult moths migrate northward in April and May.  Females lay eggs in grassy fields including rye cover crops, and the young caterpillars feed there, typically attacking corn from early may through June.  Corn planted into rye cover is at greater risk for early season armyworm feeding because the caterpillars may already be in the field and move to the corn after the rye is killed.  Armyworm can also move into corn from other fields such as wheat, in which case infestation usually occurs along field edges.

    Issue: 2016-10

Pages