Diversity of weed communities of annual crops in Cote-d'Or, France | Diversite des communautes de mauvaises herbes des cultures annuelles de Cote-d'Or (France)
2001
Dessaint, F. | Chadoeuf, R. | Barralis, G. (Institut national de la Recherche agronomique, Dijon (France) Unite de Malherbologie et Agronomie)
Weed flora of annual crops in Cote-d'Or, France, were characterized in three successive growing seasons by measuring species frequencies and abundance over 245 fields. A total of 210 species in 143 genera were recorded representing a total of 43 families with Asteraceae, Poaceae, Fabaceae, Scrophulariaceae, Brassicaceae, Lamiaceae and Caryophyllaceae predominating. More than half of the species occurred in less than 5/ of the sampled plots (fields x years) and only 9 species (namely Galium aparine L., Polygonum aviculare L., Fallopia convolvulus (L.) A. Loeve, Alopecurus myosuroides Hudson, Stellaria media (L.) Vill., Convolvulus arvensis L., Sinapis arvensis L., Veronica persica Poiret and Anagallis arvensis L.) occurred in more than 50/ of the plots. The maximum plot density was greater than 20 plants per square metre for more than one third of the species. Meanwhile, the plots where the density exceeded 20 plants per square metre, were rare and represented, for the most abundant species (A. myosuroides), less than 16/ of the plots. The total number of weed species per plots varied from 4 to 65 with a median species number of 20. In most of the plots, the weed community was mainly composed of species having a small density (less than one plant per square metre) and was dominated by only one or two species in half of the plots.
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