| Autor: |
von Redwitz, Christoph, Pannwitt, Heike, Gerowitt, Bärbel |
| Jazyk: |
German<br />English |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Julius-Kühn-Archiv, Iss 452, Pp 93-99 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1868-9892 |
| DOI: |
10.5073/jka.2016.452.012 |
| Popis: |
Weed species easily establish in crops with a similar life cycle. Especially mono-cropping provides best conditions for such weeds. In maize this is true for Echinochloa crus-galli, which is a C4 plant and one of the worst weeds worldwide. In Germany E. crus-galli is one of the few typical weed species in maize. When recurrent herbicide treatments are applied, development of herbicide resistance is likely. Since maize is typically only treated once with herbicides, later germinating weeds can escape and produce seeds. These escaping weeds are not selected for herbicide resistance. Hence, they still have a more sensitive gene pool. E. crus-galli emerges with the highest density in spring and continues to germinate over the whole vegetative period of maize. In that way the early germinating biotypes are selected for herbicide resistance while the later germinating biotypes are not. To avoid the reproduction of E. crus-galli effort is made to suppress these later germinating weeds. Using undersown cover crops is one way to do that. We hypothesize that suppressing the later germinating biotypes enhances the development of herbicide resistance. We simulated the development of herbicide resistance in populations of E. crus-galli, composed of sensitive and resistant biotypes, in a continuous maize cropping system. We used the model PROSPER for our simulations. We assumed three levels of suppression of the later germinating weeds (0%, 30%, and 100%). The results show a faster development of herbicide resistance, when the later germinating individuals are suppressed. Nevertheless, the suppressive effect of undersown crops is able to lower the weed density even with high resistance level in the population. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
