Off-target movement assessment of dicamba in North America
| Autor: | Maxwel C. Oliveira, Jason K. Norsworthy, Guilherme Sousa Alves, Rodrigo Werle, Bryan G. Young, Christy L. Sprague, Nader Soltani, Peter H. Sikkema, Ashli Brown, Daniel B. Reynolds |
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| Rok vydání: | 2020 |
| Předmět: |
Crop injury
food and beverages 04 agricultural and veterinary sciences Plant Science 010501 environmental sciences 01 natural sciences Additional research chemistry.chemical_compound Animal science chemistry Dicamba 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Agronomy and Crop Science 0105 earth and related environmental sciences |
| Zdroj: | Weed Technology. 34:318-330 |
| ISSN: | 1550-2740 0890-037X |
| DOI: | 10.1017/wet.2020.17 |
| Popis: | Six experiments were conducted in 2018 on field sites located in Arkansas, Indiana, Michigan, Nebraska, Ontario, and Wisconsin to evaluate the off-target movement (OTM) of dicamba under field-scale conditions. The highest estimated percentages of dicamba injury in non–dicamba-resistant (DR) soybean were 55%, 44%, 39%, 67%, 15%, and 44% injury for noncovered areas and 55%, 5%, 13%, 42%, 0%, and 41% injury for covered areas during dicamba application in Arkansas, Indiana, Michigan, Nebraska, Ontario, and Wisconsin, respectively. The level of injury generally decreased as the downwind distance increased under covered and noncovered areas at all sites. There was an estimated 10% injury in non-DR soybean at 113, 8, 11, 8, and 8 m; and estimated 1% injury at 293, 28, 71, 15, and 19 m from the edge of treated fields downwind when plants were not covered during dicamba application in Arkansas, Indiana, Michigan, Ontario, and Wisconsin, respectively. Assessment of filter-paper collectors placed from 4 to 137 m downwind from the edge of the sprayed area suggested the dicamba deposition reduced exponentially with distance. The greatest injury to non-DR soybean from dicamba OTM occurred at Nebraska and Arkansas (as far as 250 m). Non-DR soybean injury was greatest adjacent to the dicamba sprayed area, but injury decreased with no injury beyond 20 m downwind or in any other direction from the dicamba sprayed area in Indiana, Michigan, Ontario, and Wisconsin. The presence of soybean injury under covered and noncovered areas during the spray period for primary drift suggests that secondary movement of dicamba was evident at five sites. Additional research is needed to determine the exact forms of secondary movement of dicamba under different environmental conditions.Nomenclature: Dicamba; soybean, Glycine max (L.) Merr |
| Databáze: | OpenAIRE |
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