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Giant ragweed, if left unchecked, will compete with slower growing soybean plants for critical resources and can significantly reduce yield, with losses reaching as high as 30-90 percent in soybean field trials. 

The Plant Management Network (PMN) has released a new presentation entitled “Herbicide Resistance in Giant Ragweed” for growers, crop consultants, and extension agents discussing the biological characteristics that make giant ragweed problematic in soybean production and how its increased resistance to herbicide impacts potential control strategies.

The webcast, developed by Bill Johnson, Professor of Weed Science at Purdue University, chronicles giant ragweed’s increasing resistance to herbicide varieties and describes how stem-boring insects can aid its chances of surviving a herbicide treatment. It also discusses the:

•          Effectiveness of various herbicide application strategies
•          Herbicide varieties that best combat different resistance profiles
•          Essential techniques for optimizing ragweed control

The 20-minute presentation will remain open access through July 31 in the Focus on Soybean webcast resource.

The Plant Management Network is a nonprofit publisher of applied, science-based resources that help enhance the health, management, and production of agricultural and horticultural crops. Partnering with over 80 universities, nonprofits, and agribusinesses, PMN provides materials covering a wide range of crops and contemporary issues through the online PMN Education Center.