The importance of the research is due to the consideration that Ambrosia artemisiifolia is an invasive species from the Asteraceae botanical family originating from North America, but spread worldwide, implicitly on the European continent. This has a great capacity of invasion of the anthropic habitats (inhabited areas, vegetable gardens, arable land, roadside etc.) because it has the capacity to produce a very high number of seeds. Ragweed has increased very much its territory in the north-western side of Romania, thus Bihor County is one of the most affected by the invasion of this species mainly to the highly favourable soil and climate conditions. Near to the great land invasion capacity this species produces serious health problems to a great part of the population due to the extremely allergenic pollen that is produced in a very high amount during the flowering period. In literature is mentioned the increase of the incidence of the allergies during the ragweed flowering period, this starting generally from the second half of July till to the beginning of October. The pollen of the species Ambrosia artemisiifolia is one of the main factors that causes allergic rhinitis and also represents one of the major causes of the increase of the incidence of the asthma in the case of the sensitive persons at the summer end. The purpose of the research is to develop an evaluation of several genotypes of Ambrosia artemisiifolia L. from different locations from Bihor County. In the work were analysed too aspects regarding the variability of several morphological features of this species from different sites. Thus there was characterised the correlation among the analysed biological parameters. The studied material is represented by individuals of Ambrosia artemisiifolia collected at the beginning of August 2016 from 10 sites from Bihor County: Biharia, Tulca, Tinca, Hidişelu de Jos, Rabagani, Beiuş, Burda, Uileacu de Beiuş, Totoreni and Ştei. From every site were collected 10 plants and were determined several biometric parameters. The considered parameters were plant height (cm), root length (cm), number of ramifications and the number of male and female inflorescence there being analysed their variability and interrelation using Pearson r value. The data were processed with EXCEL application

Ambrosia artemisiifolia, flowering, biometric features, inflorescences, correlation.

biology

Presentation: poster