Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract Full Text

Determination of problem weeds and their control methods in daffodils and hyacinth fields.


This study was carried out for determine the problem weeds on daffodils and hyacinth in İzmir between 2013 and 2014. O. pes-caprae (94.74%) was determined as highest frequency of occurrence in study. E. cicutarium (52.0%), B. tectorum (50,0%), H. murinum (44.74%) and G. aparine (44.73%) together with this weed were listed in the survey as the first five weeds. As sour grass is the weed type with the highest frequency of occurrence (O. pes-caprae) and as it is an invasive weed, it is estimated that it will spread more in the following years. O. pes-caprae (115.42 Weeds/m2) has been identified as the densest weed in terms of the weed density. H. murinum (34.38 Weeds/m2), A. sterilis (26.29 Weeds/m2), T. repens (14.29 Weeds/m2), B. tectorum (11.42 Weeds/m2), E. cicutarium (8.47 Weeds/m2) followed it respectively. Herbicides with 4 different active substances were taken under evaluation in 3 replications according to a randomized complete block experiment design. When the effects of herbicides on weed dry weights, the greatest effect was obtained from Oxyfluorfen herbicide (43.20%). This effect was closely followed by Picloram + 2,4 D (43,18%). Other effective applications were Aclonifen effect (38.10%) and Phendimethalin (36.00%) and Solarization (5.60%).