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No. 22/September 08, 2000

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Lock in the Dates for the 2001 Crop Protection Technology Conference
The 2001 Crop Protection Technology Conference dates are January 9 and 10, 2001, and it will be held at the Illini Union on the campus of the University of Illinois. The conference will have a new look in 2001, one in which the participants will have more choices than at any time in the past.

More News about the Soybean Aphid
During the week of August 28, and a few days during the previous week, entomologists and plant pathologists embarked on several surveys to look for the soybean aphid. Counties in which the soybean aphid has been found include Adams, Brown, Schuyler, Champaign, Fulton, Knox, Logan, Mason, McDonough, McLean, Peoria, Tazewell, Warren, Menard, Sangamon, Boone, Carroll, DeKalb, JoDaviess, Kane, Kendall, Ogle, Whiteside, Will, and Stephenson. It's obvious that the soybean aphid is much more widely distributed than we originally thought.

A lot of entomologists and plant pathologists are planning to learn as much as they can about the soybean aphid before the 2001 growing season. In the meantime, you can view the brief video we prepared when we were visiting a soybean field in Kendall County on August 22.

Insecticides for Bean Leaf Beetle Control: Correction
In the previous issue of the Bulletin, I provided a list of insecticides that could be used for control of bean leaf beetles causing injury to soybean pods. I also provided preharvest intervals for the suggested insecticides because harvest of many fields of soybeans was imminent. A few people brought to my attention that the preharvest interval listed for Sevin XLR Plus was incorrect. Note that the label is the ultimate authority for rates, precautions, restrictions, and other information pertaining to the use of a specific product.

European Corn Borer Survey Will Be Conducted This Fall
The preharvest European corn borer survey is under way. As producers make their seed-selection choices this winter, we hope that the data collected on overwintering populations of borers can be used as one factor to aid in the decision-making process.

This article discusses how the survey is performed.

Hessian Flies and Wheat
Although the recommendation of planting wheat after the (Hessian) fly-free date seems repetitive, it is a time-proven tactic for reducing the potential for infestations by this historically threatening pest. Planting wheat after the fly-free date in a given county also reduces the likelihood of the occurrence of Septoria leaf spot, and wheat planted after the fly-free date is less susceptible to the barley yellow dwarf and wheat streak mosaic viruses vectored by aphids and mites, respectively. Finally, wheat planted on or after the fly-free date probably will suffer less from soilborne mosaic virus.

This article describes the life cycle of the Hessian fly, and discusses the fact that many biotypes of Hessian fly that overcome individual genes for resistance have developed over the years.

Wheat Seed Treatments for Fall 2000
The focus of this article is on winter wheat seed treatments. Although it's fairly easy to demonstrate improved stand establishment due to seed treatments, it does not necessarily translate into a statistical increase in yield. Even though both measures are valuable, obviously yield is more important.

The article contains results from a recent study of the performance of several wheat seed treatments, a list of common seed treatment active ingredients and the fungi they control, and a list of some of the more common products used to treat wheat seed. It also discusses several on-farm, continuous-flow treating systems on the market.

Herbicides As Harvest Aids
As crops across Illinois reach maturity and harvest approaches, weeds remaining in fields could potentially present harvest difficulties. A very few herbicides exist that could be used as harvest aids, helping to dry down existing weed vegetation prior to harvest.

The article examines some preharvest herbicides for corn (2,4-D, Roundup Ultra or UltraMax) and preharvest herbicides for soybeans (Clarity, Gramoxone Extra, glyphosate formulations).

Be on the Alert for Stalk-Quality Problems
Although windstorms were not particularly widespread in Illinois this growing season, there are some reported problems with corn that is flat or with stalks that are weak and subject to lodging. In the most severe cases, which tend to coincide with dry conditions in July and August, stalks in some fields are starting to break even without strong winds.

In areas that have been dry, it is critical that producers examine fields to see whether stalk quality has deteriorated. The only practical remedy for weak stalks is to harvest early.

In a year when growing conditions have been favorable statewide, it can be difficult to anticipate problems or to deal with them when prices are so low. But stalks might be weak even in fields where the crop looks good, and care must be taken not to lose some of the high yields that exist in most fields.

Regional Reports
Extension center educators, unit educators, and unit assistants in northern, west-central, east-central, and southern Illinois prepare regional reports to provide more localized insight into pest situations and crop conditions in Illinois. The reports will keep you up to date on situations in field and forage crops as they develop throughout the season.

This week's issue includes reports from northern Illinois and west-central Illinois.

The Pest Management and Crop Development Bulletin
Executive Editor: Kevin Steffey, Extension Entomologist

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