Current status of pests associated with urban vegetation in Bucharest area.
Pests of urban vegetation cause substantial aesthetic, economic and biodiversity damages, by weakening or completely destroying the plants. The recent climate changes, such as the excessive droughts alternating with heavy rain falls, and the significant imports of ornamental plants for urban landscape, as small parks, private gardens, and vertical walls, drastically increase the number of urban pests. These species are either newly introduced in the area, either they enlarge their host plant spectrum or increase their aggressiveness. We present the results of over a five-year period of monitoring of pests in the main city parks and private ornamental gardens in Bucharest. We detected 52 species of pests of urban vegetation. Each species locations and host plants are given. Eighteen of these species are alien to Romania: Cameraria ohridella on Aesculus hippocastanum, Cydalima perspectalis on Buxus spp., Unaspis euonymi on Euonymus sp., Corythucha ciliata and Phyllonorycter platani on Platanus sp., Corythucha arcuata on Quercus sp., Pseudaulacaspis pentagona on Syringa vulgaris and Morus alba, Adelges piceae on Picea sp., Adelges abietis on Abies sp., Adelges laricis on Larix sp., Macrosiphoniella sanborni on Chrysanthemum sp., Aphis spiraephaga on Spiraea × vanhouttei, Halyomorpha halys, Nezara viridula, Hyphantria cunea, Metcalfa pruinosa, Tetranychus urticae, and Trialeurodes vaporariorum on numerous ornamental species. Twelve of the alien species are considered invasive. More detailed information is presented for six of the most destructive species and a single case of interception for a mite not present in Europe.