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Issue No. 21/August 15, 2008

Numbers of Soybean Aphids Have Increased Significantly in Northern Illinois
In just a week, numbers of soybean aphids in northern Illinois have 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.

Short Corn Ears
Though the appearance of the corn crop is good to very good in most fields, and the pollination period was one of generally good water supply and temperatures, we have started to get reports that ears in some fields are shorter than expected.

Last Printed In-Season Issue of the Bulletin for 2008
The next printed issue of the Bulletin will not be published until September 5, but e-mail "Alerts" are likely to be sent in the meantime, given the unusual crop-growing season.

University of Illinois Agronomy Day, August 21, 2008
"Energizing Agriculture" is the theme of this year's University of Illinois Agronomy Day, held in Urbana on Thursday, August 21, 7 am to 2 pm.

A Full-Blown Soybean Aphid Outbreak in the Northwestern Midwest
Soybean aphid populations have reached economically damaging levels over much of the northwestern Midwest. If scouting indicates an insecticide application is warranted, coordinate with local beekeepers before applying sprays.

Sudden Death Syndrome Symptoms Beginning to Appear in Soybean
Multiple management practices are needed to help limit the damage of sudden death syndrome of soybean, symptoms of which are beginning to appear in Illinois.

Diplodia Leaf Streak: An Uncommon Disease of Corn in Illinois
Diplodia leaf streak, whose symptoms can be confused with northern corn leaf blight, has been observed in research plots at the Dixon Springs Agricultural Center.

Can You Help Your Soybean Crop with a Foliar Nutrient Application?
A large body of evidence indicates that the likelihood of getting a yield increase from foliar fertilization of soybean is very limited.

Soybean Crop: Progress and Prospects
Late-planted fields are not getting the temperatures needed to encourage development and retention of high pod numbers needed for high soybean yields.

Regional Reports
A report is provided this issue for northern Illinois.