2015 is proving to be a perfect example of how environmental extremes can have serious detrimental effects on insect pests. Simply stated…insects breathe air and therefore can drown! This year’s wild swings in moisture and temperature are not unique to Indiana alone, as most Midwestern states are experiencing the same.
Valent U.S.A. Corporation announced that Zeal SC Miticide has been registered by the Environmental Protection Agency (EPA) with a new liquid formulation that allows for quick mixing and easy loading. Zeal is registered for field corn, including popcorn, corn for seed and corn grown for silage, cotton and melons.
Areas of light green to yellow, often stunted, corn plants are visible in many corn fields throughout the state at this point in mid-June. There is no single cause for such crappy looking corn (Nielsen, 2012) and multiple causes may occur in the same field, which makes for challenging diagnoses and frustrating discussions with the grower.
After decades of effort, scientists are finally figuring out how insects develop resistance to environmentally friendly farming practices – such as crop rotation – that are designed to kill them. The researchers say their insights will help develop more sustainable agricultural practices.
With much of Ohio corn now planted statewide, growers who can identify any emergence problem early on will likely have a better chance of coming up with a successful solution to the issue, said an agronomist in the College of Food, Agricultural, and Environmental Sciences at The Ohio State University.
Troubleshooting early season corn insect damage can be difficult. There are several potential insect pests and some cause similar symptoms. Also, there is the possibility that if environmental and field conditions match up, new or unexpected insect damage may occur. Getting a complete “picture” of the situation will improve your diagnosis or provide more answers to questions if you seek outside help. Sometimes the answers is obvious. Other times, your diagnosis may be complete when several, but not all, clues point to one (or more?) insect.
The true armyworm is a migratory pest from the southern U.S. that feeds on the leaf tissue of early and late vegetative corn. Adult true armyworm moths are attracted to fields that contain living ground cover, which include fields with grassy weeds or cover crops such as rye or grass.
Last week, (May 19-22, 2015), some wireworm activity was noted in south-central Iowa. Ideally, scouting for wireworms should occur prior to planting because there are no effective rescue treatments. However, most people don’t see the impact this pest can have on a corn stand until corn plants emerge.
A new study from North Carolina State University and Clemson University finds that the toxin in a widely used genetically modified (GM) crop is having little impact on the crop pest called corn earworm (Helicoverpa zea) – which is consistent with predictions made almost 20 years ago that had been largely ignored.