Die infraspezifische Struktur von Chenopodium album L. in Beziehung zur Herbizidresistenz |
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| Authors: | B ARLT K JÜTTERSONKE |
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| Institution: | Akademie der Landwirtschaftswissenschaften der DDR, Institut für Pflanzenschutzforschung Kleinmachnow, Stahnsdorfer Damm 81, Kleinmachnow, 1531, Deutsche Demokratische Republik |
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| Abstract: | Herbicide resistance in relation to the infra-specific structure of Chenopodium album Chenopodium album is one of the weeds in which herbicide resistance has developed, especially to triazines. In order to identify herbicide-resistant populations at an early stage, the relationships between subtaxa of this polymorphic species and their response to her bicides was investigated. Using the infra-specific systematics of Aellen (1960) as a basis, a new structure was developed from observations over several years. The genetic stability of several anatomical characteristics was evaluated and as a result, the shape of the inflorescence was taken as the basic characteristic. Tests of her bicide susceptibility showed that the taxon with a pseudo-umbelliferous inflorescence had a higher resistance to triazines. C. album biotypes identified to be triazine resistant in the GDR since 1985 all belonged to this taxon. C. suecicum, which closely resembles C. album and often grows together with it, is highly sus ceptible to triazines. In general there was cross-resistance to triazines and chloridazon. Pyridate, bentazon, metobromuron and bromuron were fully effective against these biotypes. The activity of metribizin and combinations of bromuron or fenuron with triazines was some what reduced. Triazine-resistant biotypes of C. album responded more slowly to bromuron than susceptible plants. |
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