C.O.R.N. Newsletter

  1. Author(s): Peter Thomison

    Black layer is the stage in corn development at which kernel growth ceases and maximum kernel dry weight is achieved (also referred to as “physiological maturity”).  A killing fall frost prior to physiological maturity can cause premature leaf death or whole plant death.  This occurred over the weekend when temperatures dropped below freezing in some late planted Ohio corn that had yet “black-layered”.  The impact of frost injury to immature corn was discussed in the September 23 C.O.R.N.

    Issue: 2014-35
  2. Author(s): Pierce Paul , Author(s): Peter Thomison

    As corn harvest beings across the state, reports of stalk rot are coming in from some locations. Several factors may contribute to stalk rot, including extreme weather conditions, insects and diseases. Although it is often difficult to distinguish between stalk rots caused by these different factors, mid- to late-season northern corn leaf blight (NCLB) may have been the culprit this year. NCLB reached fairly high levels in some fields, particularly in those planted with susceptible hybrids.

    Issue: 2014-33
  3. Author(s): R. L. Nielsen

    Among the top 10 most discussed (and cussed) topics at hometown cafes during harvest season is the test weight of the grain being reported from corn fields in the neighborhood. Test weight is measured in the U.S. in terms of pounds of grain per volumetric bushel. In practice, test weight measurements are based on the weight of grain that fills a quart container (32 qts to a bushel) that meets the specifications of the USDA-FGIS (GIPSA) for official inspection (Fig. 1).

    Issue: 2014-33