Ambrosia in Berlin: pollen emission, spread and control

摘要

Climate warming leaves its mark on metropolises like Berlin. Thus the thermophilic ambrosia could spread and establish in the last years. As a consequence of this the pollen concentration reached or even exceeded the critical threshold (～10 pollen / m~3 air) for allergic persons (Taramarcaz et. al. 2006). Since the start of the "Action program against Ambrosia in Berlin" over 600 locations of Ambrosia artemisiifolia and 104 locations of Ambrosia coronopifolia have been determined as sources of emission in the year 2009, which are spread all over the city area.massing with～25 locations of over 100 plants in the south-eastern part of Berlin. Here the seed of the species Ambrosia coronopifolia is often spread by displacement of soil during construction works. The remaining part of the 48 main findings and most of the smaller findings up to a quantity of 100 plants consist of the annual Ambrosia artemisiifolia.