Investigation on turf weeds in Shenyang area

In two years,species of turf weeds were investigated and identifiied in Shenyang area.The regularity of their appearance can be definited.The results show that 48 species of turfweed can be grouped into 24 families.The major species includeTaraxacum mongolicum,Ixeris denticulata,Polygonum aviculare,Cephalonoplos segetum,Plantago asiatlca,Capsella bursa-pastoris,Erigeron canadensis,Trigontis peduncularis and Rorippa islandica.The climax period of occurrence for weeds is spring(from April to May),including annual,biennial and perennial ones.The weeds appear in great amount and cause svere damage to the turf.The dominant species in autumn are biennial or perennial weeds.Moreover,how to control weeds is discussed in this paper.