Published on Monday, June 15, 2015
The extensive rain we have experienced throughout central Indiana has had significant impact on our crops. Below you will find sales intern Christy Kettler's scouting report for the week of June 8 which touches on what we are seeing in our fields as a result of the wet conditions, as well as the trap findings and what you can expect in the coming weeks.
Be Watching for Moth Flight, Followed by Eggs
Christy Kettler | Sales Intern | Central Indiana
June 8 - June 12
This week’s warmer temperatures have started bringing back some green, but some yellow with it. The corn that was purple last week has made a turn toward yellow. This is a continuation symptom of the saturated soils Indiana saw last week. There are some areas that have lost the potential for a 100% yield due to these soil conditions, and some that remain under standing water. Keep watch over plants that are not fully submerged, for they are likely to survive if drainage occurs in the near future.
Corn that was subject to rapid growth syndrome is still showing symptoms. As the leaves begin to unfold you may notice a yellowing color, as depicted in the photo below. There have been a number of questions and concerns regarding potential yield decrease or Roundup® damage, but neither of these will occur. These yellowing leaves scattered throughout a field will not cause a decrease in yield and should turn green with sunshine. Some hybrids are much more prone to the leaves rolling in themselves and leaving the yellow leaves behind.
Yellowing leaves as a result of rapid growth syndrome.
The traps throughout north central Indiana have turned up fairly light. I have found seven black cutworm moths and 11 European corn borer moths. Again, the black cutworms are of no concern at this phase. The European corn borer moths are picking up flight. This should get farmers to start thinking of when these egg masses will appear in their fields.
The general rule of when the egg masses will show up on the underside of the corn leaves is 200 heat units after the peak of moth flight, with the corn at the V6 growth stage. Three days after masses are identified, they will hatch and begin eating and growing. Treatment should be administered 8-10 days after the egg masses are detected. Be sure to check the Purdue Entomology and Agronomy updates for more information.
If you have any questions about these findings or would like more information, please reach out to myself or your seed advisor.
Author: Denny Cobb
Categories: Agronomy, N Indiana, Michigan
Tags: Beck's Blog, AgTalk, Agronomy, Agronomy Update, Black Cutworm, agronomist, Beck's Agronomist, indiana agronomy, Indiana corn, Christy Kettler, Denny Cobb Agronomy, European corn borer