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Remain Vigilant for Palmer amaranth

  • August 3, 2016

Palmer amaranth (Amaranthus palmeri) has garnered much attention recently in both academic discussions and popular press releases, and with good reason.  Among the weedy species of Amaranthus, Palmer amaranth has the fastest growth rate and is the most competitive with the crops common to Midwest agronomic cropping systems.  Soybean yield losses approaching 80% and corn yield losses exceeding 90% have been reported in the peer-reviewed scientific literature.
While most concern focuses on Palmer amaranth in agronomic cropping systems,…

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Preharvest Intervals for Postemergence Soybean Herbicides

  • June 28, 2016

Almost all postemergence soybean herbicides have a preharvest interval or a soybean developmental stage beyond which applications cannot be made specified on their respective label.  Labels of some products may indicate both a developmental stage (before soybean bloom, for example) and a preharvest interval.  Preharvest intervals indicate the amount of time that must elapse between the herbicide application and crop harvest.  Failure to observe the preharvest interval may result in herbicide residue levels in the crop in excess of established limits. …

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How might soybean yield be affected by hail damage?

  • June 24, 2016

In the early morning hours on Wednesday, June 22 a severe storm moved through western Illinois affecting crops throughout much of Henderson, Warren and Mercer Counties, including those at the University of Illinois’ Northwestern Illinois Agricultural Research and Demonstration Center in Monmouth.  Preliminary data collected by instruments maintained by the Illinois Climate Network at the center had the wind gusting to 78.1 mph and more than 1 inch of rain falling in a 10 minute period contributing to the nightly total of 3.34 inches.…

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Postemergence Options to Control Waterhemp in Soybean

  • June 15, 2016

Waterhemp continues to be one of the most widespread and troublesome broadleaf weed species with which Illinois farmers must contend.  Factors related to the species’ biology, such as prolonged germination and emergence, obligate outcrossing, and high seed production, contribute to management challenges.  The evolution of herbicide resistance in Illinois waterhemp populations adds another very challenging obstacle for effective management.  Recently, many have sent questions and concerns regarding the inability to control waterhemp with various postemergence soybean herbicides. …

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Reminder of the 2016 Weed Science Field Research Tour

  • June 15, 2016

We would like to take this opportunity to once again extend the invitation to attend the 2016 University of Illinois Weed Science Field Research Tour, to be held Wednesday, June 29th at the University of Illinois Crop Sciences Research and Education Center, located immediately south of the main campus.  Coffee and refreshments will be available under the shade trees near the Seed House beginning at 8:00 a.m.  The tour will provide ample opportunity to look at research plots and interact with weed science faculty,…

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Maximum Corn Growth Stage for Postemergence Herbicides

  • June 9, 2016

The labels of most postemergence corn herbicides allow applications at various crop growth stages, but almost all product labels indicate a maximum growth stage beyond which broadcast applications should not be made, and a few even a state minimum growth stage before which applications should not be made.  These growth stages are usually indicated as a particular plant height or leaf stage; sometimes both of these are listed.  For product labels that indicate a specific corn height and growth state,…

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What is That Yellow-Flowered Plant?

  • May 5, 2016

The springtime color scheme provided by winter annual weed species in many no-till fields has shifted from the hearty purple of flowering henbit and purple deadnettle to the bright yellow flowers of two species.  Yellow rocket and cressleaf groundsel (a.k.a. butterweed) both produce bright yellow flowers and are common across much of the southern half of Illinois.  Although flower color is similar, the plants are distinct species.  Most of the yellow-flowered plants currently in fields is butterweed.…

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University of Illinois Weed Science Field Research Tour

  • May 4, 2016

We invite you to attend the 2016 University of Illinois Weed Science Field Day on Wednesday, June 29th at the University of Illinois Crop Sciences Research and Education Center, located immediately south of the main campus. Coffee and refreshments will be available under the shade trees near the Seed House beginning at 8:00 a.m.
Similar to past years, we will car pool to the fields where participants can join in a guided (but informal) tour format.…

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Marestail Control Prior to Planting

  • May 4, 2016

Marestail can be one of the most challenging weeds to control prior to planting no-till soybean.  Already this season some have reported poor marestail control following applications of glyphosate plus 2,4-D.  Poor control can be caused by several factors, including large plant size and resistance to glyphosate.  If a marestail population is resistant to glyphosate, a pint of 2,4-D in the spring is generally inconsistent/ineffective when it’s the only product in a tankmix active on the resistant population.…

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Stripe Rust Observed in Madison County Wheat

  • April 21, 2016

Retired commercial agriculture Extension educator Robert Bellm observed stripe rust yesterday in several wheat fields in Madison County (Figure).
Robert Bellm - Madison County 2016Figure. Stripe rust in winter wheat, Madison County, IL, April 20, 2016 (photo credit: Robert Bellm).
Rust pathogens are obligate parasites, meaning that they need a living host in order to survive. Wind and rain systems from further south bring spores to our area. This is why rust sightings in states to the South can help us in Illinois anticipate its arrival.…

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