Response of Walnuts to Simulated Drift Rates of Bispyribac-Sodium, Bensulfuron-Methyl, and Propanil
| Autor: | Bradley D. Hanson, Kassim Al-Khatib, Mariano F. Galla |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Oryza sativa
Sodium food and beverages chemistry.chemical_element 04 agricultural and veterinary sciences Plant Science 010501 environmental sciences Biology Pesticide biology.organism_classification 01 natural sciences chemistry.chemical_compound Animal science chemistry Shoot Propanil Bensulfuron methyl 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Linear correlation Agronomy and Crop Science 0105 earth and related environmental sciences Juglans |
| Zdroj: | Weed Technology. 32:410-415 |
| ISSN: | 1550-2740 0890-037X |
| DOI: | 10.1017/wet.2018.28 |
| Popis: | A field study was established to study symptoms, growth and yield of 2-year-old walnut trees exposure to simulated drift of several herbicides commonly used in rice production. Bispyribac-sodium, bensulfuron-methyl, and propanil were applied at four rates representing 0.5%, 1%, 3% and 10% of the normal use rate in rice (45, 70, and 6725 g ai ha-1, for the three herbicides respectively). Symptoms started to appear approximately 7 days after application (DAT) and peaked 28 DAT. At that time, bispyribac-sodium caused greater injury at low drift rates (6% and 15% visual injury for 0.5% and 1% rate, respectively) compared to bensulfuronmethyl and propanil. Bispyribac-sodium also appeared to slow walnut shoot elongation compared to nontreated trees; however, no yield reductions were observed either in the year after drift exposure. The effect of bispyribac-sodium simulated drift on the yield and nut quality in the year of drift exposure was evaluated in a separate study on 3-year-old walnut trees. While no yield or nut quality reductions were observed, a linear correlation between rate of bispyribac-sodium and color, an important quality factor, was found: higher herbicide rates tended to be associated with darker kernel color. Bispyribac-sodium may damage nearby walnut orchards if drifted at significant amounts. However, it is unlikely that in a field situation bispyribac-sodium would drift at high enough levels to cause the symptoms observed from the 10% use rates in this study.Nomenclature: bispyribac-sodium; bensulfuron-methyl; propanil; rice, Oryza sativa L.; walnut, Juglans regia L. |
| Databáze: | OpenAIRE |
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