Abstract
Ambrosia artemisiifolia L. and Ambrosia trifida L. belong to allochthonous invasive weeds species. They cause great damage in colonized areas because they reduce the yield of agricultural crops, and also with their competitive abilities affect the suppression of other plants and thus affect the change of plant community. As Polygonum aviculare L. is one of the most common weeds on the European continent and a very common companion of rural and urban habitats, this study examined the impact of different ratios of A. artemisiifolia and A. trifida on the occurrence and abundance of P. aviculare. Presence P. aviculare was incereased in treatments with increasing A. trifida and decreased A. artemisiifolia/m2 .
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