Dynamics of weed infestation in winter cereals under herbicide action in Dcircumflex˜imbovitail˜ta county.
The results of surveys conducted in 1978-89 revealed that winter cereals were infested by 147 weed species; 96 species were annual dicotyledons, 35 were perennial dicotyledons, 7 were annual monocotyledons and 1 was a pteridophyte. Thirty species had densities of >4 plants/m2; Matricaria inodora [M. perforata], Polygonum lapathifolium, Setaria glauca [S. pumila], Echinochloa crus-galli and Juncus bufonius had densities of 60-80 plants/m2. M. perforata was the most dominant species in the county, although it had lower densities in the S. and SE compared with central and western parts of the county. It is suggested that differential herbicide treatments are required for particular areas and fields.