The occurence of some pests and diseases on horse chestnut, plane tree and Indian bean tree in urban areas of Slovenia

Abstract

The occurrence of some pests and diseases was monitored on horse chestnut (Aesculus hippocastanum), red horse chestnut (Aesculus x carnea), plane tree (Platanus hybrida) and Indian bean tree (Catalpa bignonioides) in the period 1995-2003. The following organisms were the most common: the horse chestnut leaf-miner (Cameraria ohridella) on horse chestnut and, in recent two years, also on red horse chestnut, the Sycamore lace bug (Corythuca ciliata) and the leaf miner (Phyllonorycter platani) on plane tree. The flatid planthopper (Metcalpha pruinosa) was  found inland, in Ljubljana in 2003  on A. x carnea near a busy petrol station, and on C. bignonioides in the vicinity of a motorway intersection. Along with M. pruinosa, two new parasite fungi for Slovenia were found in 2003 Erysiphe flexuosa on A. x carnea, A. hippocastanum and Erysiphe   elevata on C. bignonioides.