Aminopyralid and Clopyralid Absorption and Translocation in Canada Thistle (Cirsium arvense)
| Autor: | Dale L. Shaner, Galen Brunk, Todd A. Gaines, Philip Westra, Vanelle F. Peterson, Scott J. Nissen, Bekir Bukun, Byron B. Sleugh |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
0106 biological sciences
food.ingredient Chromosomal translocation 04 agricultural and veterinary sciences Plant Science Absorption (skin) Pesticide Biology 01 natural sciences Clopyralid Crop 010602 entomology chemistry.chemical_compound food Animal science Agronomy chemistry 040103 agronomy & agriculture Thistle Aminopyralid 0401 agriculture forestry and fisheries Cirsium arvense Agronomy and Crop Science |
| Zdroj: | Weed Science. 57:10-15 |
| ISSN: | 1550-2759 0043-1745 |
| Popis: | Aminopyralid is a new auxinic herbicide that provides Canada thistle control at lower use rates than clopyralid. Studies were conducted to determine if differences in absorption, translocation, or metabolism account for aminopyralid's greater biological activity. Radiolabeled aminopyralid and clopyralid were applied to individual leaves of rosette-stage Canada thistle plants. Nonionic surfactant was used for the absorption studies because it provided higher aminopyralid absorption than methylated seed oil or crop oil concentrate. Clopyralid was absorbed very rapidly, reaching 72% 24 h after treatment (HAT) and remaining near or above 80% during a 192-h time course. During the same time period, aminopyralid absorption increased from 34 to 60%. Clopyralid translocation out of the treated leaf was significantly higher than aminopyralid, 39% compared with 17%, respectively, 192 HAT. More of applied clopyralid translocated to aboveground tissue 192 HAT (27%) than to roots (12%), whereas aminopyralid translocation was similar in aboveground tissue (10%) and roots (7%) 192 HAT. Neither aminopyralid nor clopyralid was metabolized 192 HAT. Although aminopyralid is effective at lower use rates than clopyralid, clopyralid absorption and translocation were higher in Canada thistle. These results suggest that aminopyralid's chemical structure may provide for greater biological activity at the target site than clopyralid. |
| Databáze: | OpenAIRE |
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