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Multi-Herbicide Resistance Research Goes a Long Way

April 7, 2017

An ounce of research is worth a ton of savings when it comes to weed resistance management, especially in a time where every input impacts the bottom line. This season, pigweed poses a serious problem to growers in the Midwest and South due to its easy spread, difficult identification and ability to develop resistance to multiple herbicides.

In 2016, the University of Illinois Plant Clinic tested approximately 2,000 waterhemp and Palmer amaranth plants from 593 fields across 10 states. The following 5 states demonstrate the highest percent of waterhemp and/or Palmer amaranth field samples that tested positive for both glyphosate and PPO inhibitor resistance.

A chart showing agronomic information on weed resistance.

Additionally, the University of Tennessee reported that 20% of sampled Palmer amaranth in TN showed resistance to PPO inhibitors. The impact of this relatively low figure can be magnified, if the weed’s seed bank is large.

Herbicides should effectively control target weeds and help maximize yield potential, rather than potentially failing and letting resistant weeds go to seed. Before choosing an herbicide program that could result in a costly weed control failure, take the Resistance Fighter® Weed IQ Quiz to test your weed resistance knowledge and boost your chances of outsmarting the weeds this season.

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