Issue No. 22/September 5, 2008
Numbers of Soybean Aphids Have Increased Significantly in Northern Illinois
In just one week in August, numbers of soybean aphids in northern Illinois increased dramatically. If you have not begun to scout soybeans diligently, start right away.
Caterpillars in Corn Ears
Yellowstriped armyworms, which rarely cause economic damage to corn ears, are being observed in north-central states this year. Don't mistakenly identify the insect as a western bean cutworm because it is unfamiliar.
Prioritizing Fertilizer Applications
Higher costs for fertilizer and other commodities call for sound strategies to produce high yields while maintaining profitability. Guidelines for ranking cropping system needs are discussed.
Fertilization for the 2009 Crop in Light of the 2008 Growing Season
This year's significant variability in yield and nutrient removal points to using variable rate technology along with yield data and updated site-specific soil sample details to guide fertilizer decisions for 2009.
Making Informed Fertilizer Applications Through Accurate Soil Sampling
It is important to optimize the distribution, depth, locations, and timing of samples collected to determine soil fertility.
Short Corn Ears
On a widespread basis, ears in some fields are being reported as shorter than expected. Possible causes are detailed.
More Ear Oddities, and a Possible Cause
Nonionic surfactant as a fungicide additive appears to be responsible for ear damage in an experiment undertaken to reproduce damage observed in 2007.
A report is provided this issue for northern Illinois.