Against the current - Clearfield® oilseed rape in Germany
The introduction of imidazolinone-tolerant oilseed rape (Clearfield® system, CL; OSR) meets with scepticism in Germany. Frequently mentioned as a major drawback for growing CL-OSR in Germany is the possible occurrence of herbicide resistant CL-volunteers which could run out of control. A monitoring...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | deu |
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Julius Kühn-Institut
2014-02-01
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| Series: | Julius-Kühn-Archiv |
| Subjects: | |
| Online Access: | http://pub.jki.bund.de/index.php/JKA/article/view/2937/3135 |
| Summary: | The introduction of imidazolinone-tolerant oilseed rape (Clearfield® system, CL; OSR) meets with scepticism in Germany. Frequently mentioned as a major drawback for growing CL-OSR in Germany is the possible occurrence of herbicide resistant CL-volunteers which could run out of control. A monitoring was started by BASF in the seasons 2011/2012/2013 on farms in Germany prior to commercial launching of the Clearfield® system. Aim of this phase was, among others, to analyse the potential for occurrence and survival of volunteers, and to identify factors which promote or minimize volunteers. The University of Hohenheim monitored 41 farms in nearly all regions of Germany during spring 2013 in the crops following to CL-OSR (harvested in summer 2012), mostly winter wheat. Volunteer OSR was counted on the fields and molecularbiologically analysed, and the soil seed bank was investigated in 0 – 30 cm soil depth. Additionally, data about field history and cultivation were gathered. Several CL-varieties were tested at the same time in the laboratory for secondary dormancy. First results showed variation in dormancy from high (>90%) to nearly no dormancy of the tested CL-varieties, similar to common varieties. The situation on farmers fields corresponded to dormancy values: 40 – 49% of all farms had no CL-soil seedbank or volunteers at all, and a maximum of 1000 CL seeds m-2 and two CL-volunteers m-2 were observed on the other farms. Conventional seed banks and volunteers additionally occurred on the majority of the farms. Overall, seed survival and volunteer emergence of CL-OSR can be assessed as medium-low compared to previous studies with conventional varieties. Volunteers observed after CL growing do not necessarily originate from this crop. The regression analysis showed no clear effects, probably because of the low number of sampling sites. This monitoring did not reveal specific disadvantages linked with CL-oilseed rape in terms of volunteers. |
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| ISSN: | 1868-9892 1868-9892 |