No. 05/April 26, 2002|
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|IN THIS ISSUE:|
|University of Illinois Plant Clinic Service|
The plant clinic serves as a clearinghouse for plant problems sent to the University of Illinois, from May through mid-September. Diagnoses are provided on field crops, trees, shrubs, turf, fruit, vegetables, or any other type of plant you can imagine.
Services include plant and insect identification; diagnosis of disease, insect, weed, and chemical injury symptoms; nematode assays; and help with nutrient-related problems, as well as management recommendations involving these diagnoses.
|Pesticide Registrations: "Section What?"|
In the April 5 issue of the Bulletin, Kevin Steffey discussed Section 2(ee) supplemental pesticide labeling. Companies issue Section 2(ee) recommendations for products to control pests in crops for which the products are already registered. These recommendations allow companies to offer quick "updates" before the federal label is amended. This article explains two other, often confusing, types of supplemental labels that also merit your attention: section 24(c) registration and section 18 registration.
|"Intense" Captures of Black Cutworm Moths Continue|
We have received many reports of intense captures of black cutworms within the past week. The cool weather fronts that followed on the heels of our unusually warm weather during the week of April 15 were replete with migrating black cutworms. Intense captures were especially prevalent during April 19-21. Entomologists in Indiana and Missouri have also reported captures of high numbers of black cutworm moths.
|More Information About Mustang Insecticide|
Mustang, the newly registered pyrethroid manufactured by FMC Corporation, also can be applied before, during, or after planting for cutworm control.
|Captures of Armyworms and Corn Earworms, Too|
The numbers of armyworms and corn earworms captured in traps are not as impressive as the numbers of black cutworms captured thus far, but we will continue to monitor their presence.
The numbers of armyworms captured this year are less than the numbers captured in 2001. This doesn't mean that armyworm problems won't develop in wheat or grass hay or pasture, but at least we are watching these insects more closely this year.
|White Grubs Causing Problems Again in 2002|
It's early in the growing season, but many people already have the sense that white grubs will be problematic again this year. Remember that it is important to accurately identify the species of grubs you find.
|Replanting and Application of Soil Insecticides|
Recent heavy rains, followed by much colder temperatures, have resulted in a few instances of corn having to be replanted in some fields. Some of the farmers affected had applied soil insecticides for control of corn rootworms, cutworms, white grubs, or wireworms, and they want to apply an insecticide again during replanting. Under this scenario, what's legal? Can the insecticide applied the first time be applied again during replanting? What are the maximum use rates of specific soil insecticides within a growing season? This article addresses these questions.
|Remember Armyworms? Look in Wheat and Grass Hay Fields First|
This article contains descriptions of the insects and the damage they cause, and suggestions for control.
|Several Reports of Aphids in Wheat|
Aphids have been found in wheat fields in southern Illinois. Entomologists from Indiana also have reported that aphids in wheat are common in southern Indiana.
By themselves, aphids rarely cause injury to wheat in Illinois. However, they can transmit barley yellow dwarf virus (BYDV). The yellowing caused by BYDV usually appears in late spring.
|Alfalfa Weevil Damage Is Severe in Southern Illinois, Activity Picking Up in Central Illinois|
Reports from southern Illinois, southern Indiana, and southern Missouri indicate that alfalfa weevil damage is severe in many fields. In central Illinois, alfalfa weevil activity is beginning to pick up steam. The warning signs were in place for a "bumper year" for alfalfa weevil problemshigh numbers of overwintering eggs in southern areas, mild winter weather. So now it's a matter of staying on top of it and preventing serious yield losses.
|Virus in Winter Wheat|
Symptoms characteristic of viral infection are showing up on the winter wheat crop in several areas of the state. Many area fields show the yellowing typically associated with infection by barley yellow dwarf virus (BYDV).
Although aphids can and do transmit the virus in the spring, fall infection by BYDV presents a more serious situation for the plant.
|Yield Loss from Foliar Blights in Wheat|
Conditions are primed for development of foliar fungal infections in areas of the state that have had intense sustained rains. This presents an extremely conducive environment for development of foliar fungal blights on the wheat crop. Plants already infected with virus disease can also host fungal infections. Start scouting for fungal leaf blight development this week.
|What Weed Is That?|
The warm weather during the week of April 15 encouraged the growth of many weed species in no-till fields. Trying to figure out what some of these early-season weed species are can sometimes be difficult, so we thought a short review on identification would be beneficial. This article provides descriptions and color photographs of many of these species.
|Windy Conditions and Herbicide Applications|
The problem of herbicide drift remains with us. We understand that, with the number of acres covered by commercial applicators, applications are sometimes made under less than ideal conditions. However, there are not many "good things" that come from herbicide drift complaints, not to mention the potential weed control problems if too much of the herbicide moves out of the intended target area.
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 and west-central Illinois.