Effect of the foliar application of diquat herbicide on selected natural area and field crop species |
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| Authors: | ATUL PURI GREGORY E MACDONALD DONN S SHILLING WILLIAM T HALLER |
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| Institution: | Center for Aquatic and Invasive Plants and;Department of Agronomy, University of Florida, Gainesville, Florida and;Crop and Soil Sciences, University of Georgia, Athens, Georgia, USA |
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| Abstract: | Field experiments were conducted to determine the non-target impact of foliar-applied diquat on selected plant species. Diquat was applied to emerged bracken fern, chain fern, slash pine, soybean, sunflower, cotton, corn, and onion at rates varying from 0.02–4.5 kg ai ha?1 of diquat cation, which allowed for the determination of the no-effect rate and the rate that caused 25, 50, and 100% injury, as measured by visual injury ratings, plant heights, and dry weights. Bracken fern, chain fern, and slash pine were more tolerant to diquat and exhibited regrowth potential at the higher rates. The other six species were not only more susceptible to diquat, but they did not exhibit regrowth potential at high rates. However, these species were able to recover from slight injury caused by the lower rates of diquat. |
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| Keywords: | diquat field crops foliar application natural area species non-target impact |
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