Indiana CCA Conference 2018 Presentation



Pest Management
Wed, Dec 19, 2018
4:00pm to 4:50pm


Pest Management
Wed, Dec 19, 2018
11:00am to 11:50am


The continual evolution of weed species and populations resistant to herbicides from one or more mechanism-of-action families represents one of the most daunting challenges faced by weed management practitioners.  Currently in Illinois, biotypes of 12 weed species have been confirmed resistant to one or more herbicide mechanisms of action.  Resistance to herbicides that inhibit the ALS enzyme is the most common type of resistance in Illinois.  Waterhemp has evolved resistance to more herbicide mechanisms of action than any other Illinois weed species, including resistance to inhibitors of acetolactate synthase (ALS), photosystem II (PSII), protoporphyrinogen oxidase (PPO), enolpyruvyl shikimate-3-phosphate synthase (EPSPS), hydroxyphenyl pyruvate dioxygenase (HPPD), and the plant growth regulator 2,4-D.  Not every individual waterhemp plant is resistant to one or more herbicides, but the majority of field-level waterhemp populations contain one or more types of herbicide resistance.  Perhaps even more daunting is the occurrence of multiple herbicide resistances within individual plants and/or fields.  Waterhemp plants and populations demonstrating multiple herbicide resistance are becoming increasingly common and greatly reduce the number of herbicide options that remain effective for their control.


Aaron Hager

Associate Professor of Weed Science
University of Illinois

Aaron Hager is an associate professor of extension weed science in the Department of Crop Sciences at the University of Illinois. He attended Southern Illinois University, Carbondale and received a B.S. in Plant and Soil Science in 1991. He then went to Michigan State University and received his M.S. in weed science in May, 1993. Later that month, he joined the University of Illinois as a weed science extension specialist. In 2001, he completed his Ph.D. in weed science and joined the Department of Crop Sciences faculty ranks in 2002. As an associate professor of weed science at the University of Illinois, Dr. Hager is responsible for weed biology and management research in corn and soybean production systems. His research focuses on examining the biology and management of weed species that are common in Illinois agronomic crops.