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No. 11/June 08, 2001

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Diagnostic Help Available Locally
Now in its second year of statewide service, Extension's Distance Diagnostics system continues to help rural and urban Illinois residents get quick and accurate diagnosis of their plant and pest problems. Since last June, 1,100 samples have been posted to the system. Samples are sent for weed and insect identification; sick, damaged, and stressed plants are also submitted.

Illegal Insecticide Applications Reported in Wheat
The National Grain and Feed Association informed its members that the Environmental Protection Agency and the Food and Drug Administration, in cooperation with state department of agriculture officials, were investigating reports of illegal applications of an insecticide to wheat. Investigations are occurring in as many as eight states where armyworm infestations have caused injury to wheat, corn, and pasture.

The investigations are concentrating primarily on the suspected use of Fury, a synthetic pyrethroid (zeta-cypermethrin) manufactured by FMC Corporation. The FDA may seize any wheat that enters interstate commerce that contains illegal residues of this insecticide.

Second Armyworm Flight Under Way in Southern Illinois
True armyworm moths are still being caught in southern Illinois. These moths represent migrants from more southern states or the adult stage of armyworms that were recently feeding in pastures, cornfields, or wheat fields of southern Illinois.

Armyworm outbreaks are generally curtailed in warm and dry weather by natural enemies (parasitoids and predators). Unfortunately, for much of Illinois, the weather has been cool and wet. Let's hope we see some sunshine in the near future.

Burrower Bugs Perplex Producers in Southern Illinois
We have received many reports of burrower bug activity in corn and soybean fields south of Interstate 70 in Illinois and Indiana and in southern Illinois. This article answers the following questions about these insects.

What are burrower bugs?
How do they injure plants?
Are there any suggested economic thresholds or labeled insecticides for burrower bugs in corn and/or soybeans?
Why are burrower bugs more numerous this year?

Variegated Cutworms Clipping Stems in Soybean Fields
Variegated cutworms are causing economic stand reductions in some soybean fields. Thus far, in Logan County, approximately 1,000 acres of soybeans have been replanted due to variegated cutworm damage to emerging soybean seedlings. Most of the cutworm injury has occurred in fields that lacked any fall tillage and where chickweed infestations were present.

Rescue treatments should be considered in soybean fields if 20% of the plants have been cut, the stand has gaps of 1 foot or more, and cutworms are present and continue to feed.

Reports of Grape Colaspis Damage Continue
Reports of grape colaspis damage continue to come in from the western portion of Illinois. The cool, wet weather has slowed evaluation of many of the research trials currently being conducted by the University of Illinois. We will provide a summary of data from the insecticide evaluation trials as they become available.

Update on Soybean Diseases and Diagnosis in Illinois
We have received reports of damping-off as well as root and foliar disease symptoms on soybean. To date most reports have come from the central and western parts of the state.

If you are thinking about replanting, you may want to consider seed treatments for diseases affecting roots and hypocotyls or a different cultivar for foliar diseases. Resistance is not available for some foliar diseases, however, so be sure to check with your seed dealer for information on available cultivars.

Choose the Proper Gloves When Handling Pesticides
As every applicator knows, gloves (among other personal protective equipment) should be worn to protect against contact with pesticides. However, choosing the right glove for the job may be a bit confusing, especially when using a variety of pesticides.

This article provides information for properly selecting a glove material that is appropriate for the pesticide formulation used. The EPA Glove Chart is reproduced here, and a discussion of glove materials and usage tips is included.

Pesticide Record-Keeping Requirements
While most applicators keep pesticide application records because it makes good agronomic sense to do so, there are legal reasons to keep these records as well. The purpose of this article is to sift through the gossip and guessing about the record-keeping requirements and get to the facts.

The type of information you are legally required to keep depends on your type of business and the type of pesticide you use. The article discusses private applicators, commercial applicators, and pesticide dealers, and provides information about WPS record-keeping.

Syngenta Receives Callisto Registration
Callisto 4 SC (mesotrione) recently received a label for use in corn. This herbicide's mode of action is as a pigment inhibitor. Callisto has good activity on a number of broadleaf weed species; however, it is not effective for the control of most grass weeds. This article includes a table containing Callisto efficacy ratings on various broadleaf weed species taken from research trials conducted at the University of Illinois and other Midwest universities.

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 east-central, northern, southern, and west-central Illinois.

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

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