Date of Award

12-1-2016

Degree Name

Master of Science

Department

Plant and Soil Science

First Advisor

Walters, Stuart

Abstract

Management of volunteer horseradish is a challenge when grown in rotation with other crops, such as corn and soybean. Although, volunteer horseradish does not generally cause yield loss, these plants serve as hosts for various soil-borne pathogens that inflict damage to subsequent horseradish crops. Field studies were conducted to evaluate the effect of glyphosate and dicamba on volunteer horseradish growth and development. The application of glyphosate plus dicamba provided the greatest control and biomass reduction, while glyphosate alone provided the greatest reduction in viability. In addition to volunteer horseradish, Palmer amaranth (Amaranthus palmeri) is becoming difficult to control in southwestern Illinois. Its ability to withstand drought, produce high numbers of seed, and rapid growth make it often times difficult to control. Field studies were conducted to evaluate the effect of glyphosate and dicamba on the growth and development on Palmer amaranth. In both 2014 and 2015, sulfentrazone (preemergence) followed by glyphosate plus dicamba (postemergence) provided the greatest control of Palmer amaranth, while allowing horseradish to be planted the following spring.

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