Over the past few weeks, Ohio State University researchers have been receiving calls, emails and texts about finding large caterpillars feeding on corn ears. In most cases, these are turning out to be Western bean cutworms.
December 2015 corn futures traded as much as $0.30 lower on August 12 following the USDA's surprisingly large yield forecast and closed $0.20 lower for the session. The price of that contract rallied about $0.15 in the following week, but started moving lower again late last week.
With so much attention focused on the nation’s corn struggling against Mother Nature, it’s time to focus on the states with the best corn conditions in the country.
According to the USDA, 69 percent of the nation’s corn is in good or better condition, unchanged from last week but 4 percentage points below last year’s progress. Of that, four states in particular – Iowa, Kentucky, Minnesota and Tennessee – are reporting high percentages of corn in these conditions:
In an effort supported by the National Corn Growers Association, the Monsanto Insect Management Knowledge Program awarded Dr. Felicia Wu, from Michigan State University, a grant for the proposal entitled “An Agent Based Model of Insect Adaptation to Transgenic Insecticidal Corn”.
Understand this one simple fact about yield monitors: They do not measure yield. What I want you to understand is that yield monitors ESTIMATE yield by converting electrical signals received from a mass impact or optical sensor in the clean grain elevator into ESTIMATES of grain flow (lbs) per second or two of travel time.
Diplodia ear rot, caused by the fungus Stenocarpella maydis (formerly known as Diplodia maydis), has been observed in Kentucky corn fields the last couple of weeks. These observations are due to the frequent rainfall that occurred just before and throughout silking. Corn ears are most susceptible to infection by this ear rot fungus from beginning silking to approximately 3 weeks later.
Weeds that escape control not only impact crop yields but also produce seeds that contribute to future problems. While it is too late to protect crop yields from weed-related losses, in some situations the quantity of weed seed that is produced can be reduced.
By Bruce Potter, IPM Specialist, and Ken Ostlie, Extension Entomologist, University of Minnesota
As agriculturalists re-enter corn fields to scout corn rootworm beetle populations and begin to estimate yield potential, they often find some unwelcome aphid visitors. Heavy infestations on ears and adjacent leaves can grab your attention and trigger the “Should I spray question?”