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Agronomic Crops Network

Ohio State University Extension

CFAES

C.O.R.N. Newsletter

  1. Spraying Insecticides on Soybeans and Honey Bees

    Author(s): Andy Michel , Author(s): Reed Johnson

    Although soybean aphids remain at low levels in Ohio, we are aware that many growers are adding insecticides to spray tanks when applying fungicides for plant health purposes and even late applications of herbicides because: “Well, I’m going over the field anyway so I thought I’d add an insecticide for insurance purposes! The insecticide is relatively cheap and soybeans are worth so much!” As we have always stated, we do NOT recommend this practice, and feel an IPM approach is much better for everyone and everything, including the environment.

    Issue: 2016-23

  2. Two New Products Available for Twospotted Spider Mite Management (One for Each Spot)

    Author(s): Kelley Tilmon , Author(s): Andy Michel

    With continued dry weather, the pest we’ve been getting the most calls about is the spider mite.  This is just a reminder that vigilant scouting for this pest is a good idea right now.  It is also important to re-scout 5 days after treatment because many products will not kill the eggs, and populations can resurge.  Any nescessary followup treatment should be made with a product with a different mode of action to reduce resistance development (so, for example, if you used something with bifenthrin the first time, you might switch to Lorsban the second time, or vice versa).  This link will t

    Issue: 2016-23

  3. Seeking a Twospotted Spider Mite Trial Location

    Author(s): Kelley Tilmon , Author(s): Andy Michel

    As we mentioned in a previous newsletter article, there is a product newly labeled for spider mite control in soybean and sweet corn (Agri-Mek SC).  We would like to test this product in Ohio soybeans, and are looking for a producer field for this trial.  The soybean field must have an at-threshold spider mite population to treat, and the producer must be willing to leave some untreated check strips.  The product will be free.  If you would like to participate in this trial please contact Kelley Tilmon at tilmon.1@osu.edu or 330-202-3529

    Issue: 2016-22

  4. Spider Mite Be a Problem

    Author(s): Kelley Tilmon , Author(s): Andy Michel

    With continued hot, dry weather it is important to remain vigilant for emerging twospotted spider mite problems in field crops.  Look for characteristic yellow stippling on leaves and confirm the presence of mites by tapping vegetation over a piece of black construction paper (which works better than white paper, though white will do) and looking for dust that crawls.  Increasing mite populations often start on field edges, and edge treatments may work if problems are caught early.  But if mites are found beyond the field borders and if conditions are very favorable for mite increase (conti

    Issue: 2016-22

  5. Insect Pests we’re Watching Now

    Author(s): Kelley Tilmon , Author(s): Andy Michel

    Spider mites

    With continued dry weather, spider mites are one of the main pests to remain vigilant about in field crops.  They will often show up in field borders first as they move in from other habitats, for example if nearby ditches have been mowed.  Spider mites are difficult to see.  Look for injury signs -- yellow spotting or stippling on the upper side of leaves.  In soybean this damage usually begins in the lower canopy and progresses upward as the mite population increases.  Heavily infested leaves may also have light webbing similar to spider webs. 

    Issue: 2016-20

  6. Two-spotted Spider Mite Awareness

    Author(s): Kelley Tilmon , Author(s): Andy Michel

    Though we have not received many reports of spider mites in field crops, continued hot dry weather will favor this pest, and scouts should keep their eyes open for mites and their stippling damage.  We will provide a more comprehensive article later in the season if reports indicate that spider mites are on the rise.  For more information, see

    Issue: 2016-18
  7. Caption: A) milk jug (picture from Iowa State University), B) lure setup for placement on milk jug, C) green buck trap D) WBC larvae feeding and damage.

    Western Bean Cutworm Trapping Should Begin Soon

    Author(s): Andy Michel , Author(s): Kelley Tilmon

    Western bean cutworm (WBC) is an ear-feeder of corn, but the adults begin to emerge in late June.  The number of adults caught in traps give us an indication of when to scout for eggs (note: it is NOT a measurement of economic threshold).  Usually peak flight occurs anytime between the 2nd to 4th week of July, and, based on the spring temperatures, we seem to be headed in that direction.

    Issue: 2016-17

  8. Have you been slimed? Slug damage reports are coming in

    Author(s): Kelley Tilmon , Author(s): Andy Michel

    Numerous locations in Ohio are still reporting slug problems, especially on soybeans. With late planting in many areas, the small size of both soybean and corn will lead to a greater damage potential from slugs.

    Issue: 2016-16
  9. cereal leaf beetle feeding in wheat

    Insect Concerns for Late Planting

    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

  10. Introducing Dr. Kelley Tilmon

    Author(s): Kelley Tilmon

    In January, Dr. Kelley Tilmon joined the faculty of the Department of Entomology as an Associate Professor and State Specialist for field crop entomology. Her extension, research, and teaching programs will focus on the management of insect pests of agronomic crops. She will be based out of the Ohio Agricultural Research and Development Center (OARDC) campus in Wooster.  Kelley has an M.S. in entomology from the University of Delaware, a Ph.D.

    Issue: 2016-1

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