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Herbicide Resistance in Waterhemp: PPO inhibitor and Glyphosate Testing University of Illinois Plant Clinic 2016

What is your waterhemp doing ? Waterhemp glyphosate and PPO inhibitor resistance testing was offered by the Plant Clinic for the first time in 2015. Due to the strong demand for this testing, we are offering it again this year.… Read more

University of Illinois Plant Clinic: Celebrating 40 Years of Service to Illinois

Anniversary Overview of Plant Clinic: Welcome to another year of service at the Plant Clinic! Since 1976, the University of Illinois Extension Plant Clinic has served as a clearinghouse for plant problems. Housed first in the Department of Plant Pathology and now Crop Sciences, the Plant Clinic was originally developed to help County Cooperative Extension staff and campus-based Extension specialists with requests for diagnoses on a wide variety of plants.… Read more

Update on Soil Nitrogen

Corn planting has moved ahead of the 5-year average, with 66% of the Illinois crop planted by May 1. Early planting usually means an early start to nitrogen uptake. But N uptake is slow for a month or more after planting: in one study we did in 2015, plants at the 4-leaf stage about five weeks after planting had only 4 pounds of N per acre in the above-ground part of the plant.… Read more

What is That Yellow-Flowered Plant?

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.… Read more

University of Illinois Weed Science Field Research Tour

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.… Read more

Marestail Control Prior to Planting

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. … Read more

Black Cutworm Activity Increasing Across Illinois

*Edited April 28 to include significant flights and projected cutting dates for Carroll, Effingham, and Ford counties.

Black cutworms have been observed in traps across the state for the past couple of weeks. Several counties have reported significant moth flights (9 or more moths over a 2-night span).… Read more

Stripe Rust Observed in Madison County Wheat

Retired commercial agriculture Extension educator Robert Bellm observed stripe rust yesterday in several wheat fields in Madison County (Figure).

Figure. 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.… Read more

Planting Date: Corn or Soybean First?

Corn planting in Illinois has gotten into gear over the past week, with 12 percent of the state’s crop planted by April 17. That’s close to the planting pace of a year ago, and is behind the 5-year average only because that average includes 2012, when nearly half of the state’s corn crop was planted by mid-April.… Read more

Spring Nitrogen Management for Corn

Even though the price of nitrogen fertilizer has dropped some in the past year, the lower price of corn means that decisions about N management need to be made carefully, with an eye towards maximizing the return to this critically important input.… Read more