CORN Newsletter – April 21


April 21 – April 27, 2020


Editor: Amanda Bennett


How cold is too cold (for winter wheat)?

Authors: Laura Lindsey, Alexander Lindsey, Aaron Wilson

Overnight temperatures on April 15 and April 16, 2020 dropped into the low to mid 20s across a large portion of Ohio (Figure 1), and unofficial reports show a few locations briefly dropped into the upper teens! These temperatures were generally 12-20°F below average (1981-2010).

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Freeze Potential in Ohio

Authors: Aaron Wilson, James Jasinski

Note: This article has been modified from an article originally published in VegNet Newsletter ( on April 6, 2020.

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Alfalfa Weevil Update

Authors: Kelley Tilmon, Aaron Wilson, Mark Sulc, Rory Lewandowski, CCA, Andy Michel

Last week we reported that peak alfalfa weevil feeding damage occurs between 325 and 575 heat units (based on accumulation of heat units from January 1 with a base of 48°F).  The cool temperatures over the past seven days have slowed the accumulation of heat units and thus weevil development, tho

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Slight Frost Injury on Forages

Author: Mark Sulc

I have observed and received reports of only very slight frost burn on the tips of leaves of alfalfa and winter annual forage crops after the two cold nights last week in Ohio.

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Worried about Fallow Syndrome? Assess the Risk with On-Farm Research

Authors: Stephanie Karhoff, Steve Culman, Elizabeth Hawkins

Wet weather conditions last spring prevented Ohio farmers from planting over 1.5 million acres.

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Cool weather to hang on for the rest of April

Author: Jim Noel


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Time to stock up on nozzles is now! But, do you know which ones to buy?

Author: Erdal Ozkan

This is the time of the year you must complete shopping for nozzles because the spraying season is just around the corner. Although nozzles are some of the least expensive components of a sprayer, they hold a high value in their ability to influence sprayer performance.

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Managing stored grain into summer

Authors: Jason Hartschuh, CCA, Elizabeth Hawkins

If you are storing more grain on farm this spring than usual, you are not alone. Over the last few weeks, we have heard from more producers who are considering holding grain longer into summer months than they normal would.

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About C.O.R.N. Newsletter

C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.




Glen Arnold, CCA
Field Specialist, Manure Nutrient Management


Mark Badertscher
Hardin County


Jordan Beck
Extension Associate


Lee Beers, CCA
Trumbull County


Ben Brown
Farm Management Program Mgr, Program Manager


Ann Chanon
Lorain County


Rachel Cochran
Extension Associate


Trevor Corboy
Greene County


Steve Culman
State Specialist, Soil Fertility


Sam Custer
Darke County


Wayne Dellinger
Union County


Anne Dorrance
State Specialist, Soybean Diseases


Amanda Douridas
Champaign County


Mike Estadt
Pickaway County


Boden Fisher
Extension Associate


Ken Ford
Fayette County


Allen Gahler
Sandusky County


Mike Gastier, CCA
Huron County


Mary Griffith
Madison County


Will Hamman
Pike County


Jason Hartschuh, CCA
Crawford County


Elizabeth Hawkins
Field Specialist, Agronomic Systems


Andrew Holden
Ashtabula County


Dean Kreager
Licking County


Greg LaBarge, CPAg/CCA
Field Specialist, Agronomic Systems


Alan Leininger
Program Assistant


Ed Lentz, CCA
Hancock County


Rory Lewandowski, CCA
Wayne County


Mark Loux
State Specialist, Weed Science


David Marrison


Clifton Martin, CCA
Muskingum County


Andy Michel
State Specialist, Entomology


Brigitte Moneymaker
Extension Associate


James Morris
Brown County


Gigi Neal
Clermont County


Jim Noel
National Weather Service


Sarah Noggle
Paulding County


Tony Nye
Clinton County


Les Ober, CCA
Geauga County


Erdal Ozkan
State Specialist, Sprayer Technology


Eric Richer, CCA
Fulton County


Dennis Riethman
Mercer County


Matthew Romanko
Extension Associate


Garth Ruff
Henry County


Beth Scheckelhoff
Putnam County


Matt Schmerge
Shelby County


Clint Schroeder
Allen County


Jeff Stachler
Auglaize County


Mark Sulc
State Specialist, Forage Production


Barry Ward
Program Leader


Harold Watters, CPAg/CCA
Field Specialist, Agronomic Systems


Aaron Wilson
Byrd Polar & Climate Research Center


Curtis Young, CCA
Van Wert County


Chris Zoller
Tuscarawas County


The information presented here, along with any trade names used, is supplied with the understanding that no discrimination is intended and no endorsement is made by Ohio State University Extension is implied. Although every attempt is made to produce information that is complete, timely, and accurate, the pesticide user bears responsibility of consulting the pesticide label and adhering to those directions.

CFAES provides research and related educational programs to clientele on a nondiscriminatory basis. For more information, visit For an accessible format of this publication, visit

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