Suppressive Potential of Some Perennial Grasses on the Growth and Development of Ambrosia artemisiifolia

1 Bulgarian Academy of Sciences, Institute of Biodiversity and Ecosystem Research, Department of Plant and Fungal Diversity and Resources, BG-1113 Sofia, Bulgaria
2 Agricultural Academy, Institute of Soil Science, Agrotechnologies and Plant Protection “Nikola Pushkarov”, Plant Protection Department, BG-2230 Kostinbrod, Bulgaria


Vladimirov, V., M. Valkova, S. Maneva and S. Milanova, 2017. Suppressive potential of some perennial grasses on the growth and development of Ambrosia artemisiifolia. Bulg. J. Agric. Sci., 23 (2): 274–279

Common ragweed (Ambrosia artemisiifolia) is one of the worst invasive alien species in Europe with a strong negative impact on human health and agriculture. Therefore, search for effective methods for its control is crucial. The aim of this study was to test the suppressive potential of some perennial grasses on the growth and seed production of A. artemisiifolia. For this purpose, greenhouse and outdoor pot trials were conducted. The following grass species were used in different combinations – Lolium perenne ‘Temprano’, Dactylis glomerata ‘Alba’ and Phleum pratense ‘Tundra’. Commercially available seeds of the grasses were obtained, whereas the seeds of A. artemisiifolia were collected from established populations in Kostinbrod town, West Bulgaria. For comparison with chemical control some trial variants were treated with Maton 600 EC (600 g/L 2,4 D ester). Fresh weight of biomass per plot, height of plants and the number of A. artemisiifolia plants were recorded three times in 2010–2011 in the greenhouse experiments and four times in 2011–2012 in the outdoor trials. Also, at the end of each vegetation season the seeds of A. artemisiifolia in each pot were collected and counted. The data was processed by the analysis of variance using F-test for testing signifi cance and LSD for signifi cance of difference between control and variants at levels of P < 0.05. The results showed that all the three grass species can effectively suppress the growth and seed formation in common ragweed, although L. perenne developed more rapidly from the fi rst year, and thus expressed its suppressive capacity earlier than the other two species. At the time of last recording of the results there were no signifi cant differences between the variants treated and not treated with herbicides except for the pure A. artemisiifolia stands (control trials). Thus, the study offers an effective means for control of A. artemisiifolia in waste lands and disturbed areas by combining the use of competitive perennial tuft-forming grasses and discontinued soil disturbance.

Key words: Ambrosia, control of invasive species, invasive species, suppressive potential

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