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Issue No. 23/October 7, 2005

New Nitrogen Rate Guidelines for Illinois
University agronomists from a number of Corn Belt states have been collaborating on a new approach to nitrogen rate recommendations. How this work applies to rates in Illinois is detailed.

Looking for Volunteers for On-Farm N Rate Trials
Volunteers from all parts of Illinois are needed to carry out trials using field-scale plots and equipment to better support the new recommendations for nitrogen rates. Details are outlined for what participation involves.

An Addendum to the Preliminary Root Rating Results for DeKalb and Urbana, 2005
Differences found between early and later evaluation dates in corn rootworm product trials should be interpreted with care.

Nitrogen for Corn in 2006
Recent reports suggesting that nitrogen rate recommendations for corn in Illinois are inaccurate have created a great deal of confusion. This unfortunately is coming at a time when N prices are record-high, yields in some Illinois corn fields were reduced by drought in 2005, and corn prices have been held down by reports of higher supplies and some shipping problems.

Mark Your Calendar for Some University of Illinois Educational Programs
Dates and topics are detailed for the Crop Protection Technology Conference, Corn and Soybean Classics, and Regional Crop Management Workshops.

Update on Annual Survey for Second-Generation European Corn Borer
Results to date for the annual fall survey of second-generation European corn borer indicate higher infestation levels and numbers of larvae than in recent years.

Corn Earworm, European Corn Borer, Fall Armyworm, or Western Bean Cutworm: Which One Is Causing the Injury I'm Finding on My Corn Ears?
Some producers are finding insect injury to corn as they reenter fields. Differences are described for the similar-looking injuries caused by corn earworm, European corn borer, fall armyworm, and western bean cutworm. Know what insects you face in deciding on hybrids for 2006.

Results from the 2005 Survey for Western Corn Rootworm Larval Injury in Corn Planted After Soybeans
There appears to be some expansion of the range of the variant western corn rootworm into southern and southwestern Illinois. Producers need to step up their efforts to monitor for injury in corn planted after soybeans in 2006.

Preliminary Root Ratings for the Corn Rootworm Control Trial in Monmouth
Node-injury ratings are presented from the corn rootworm control trial in Monmouth. Results were very similar to those obtained in DeKalb and Urbana.

Syngenta Has Indicated a Mistake in the Rate of Cruiser Extreme-Treated Seeds in University of Illinois Corn Rootworm Trials in 2005
An error in the seed used in corn rootworm trials should be noted when reviewing and interpreting data published for Urbana and DeKalb trials.

New Fungicide Resource Online
"Characteristics of Fungicides for Field Crops" is a new Report on Plant Diseases available online.

Over-the-Winter Soybean Rust Review
Information resources and programs addressing soybean rust are summarized.

What's the Potential for Herbicide Carryover in 2006?
Limited soil moisture can reduce herbicide dissipation in soils, which may result in residues high enough to injure susceptible rotational crops. The factors to be considered when determining the potential for herbicide carryover are detailed.

Japanese Hops
Japanese hops have been found in Illinois this year. Characteristics and control options are outlined for this weed, listed as an invasive species in many states surrounding Illinois.

Responding to Increasing Nitrogen Cost
How corn producers should manage nitrogen in the face of unprecedented costs is addressed in detail.

Regional Reports
Reports are provided this issue for northern, southern, and west-central Illinois.