Occurence and distribution of insects associated with street trees as well as the growth condition of these trees on 14 main streets in northern part of Taipei City were investigated and assessed. Among the 19 species of street trees, 11 were found in good health while 8 in poor condition. A total of 29 species of insects, belonging to 6 orders, 19 families, were associated with all 19 species of street trees but Spathodea comparulata. Insects with the highest frequency of occurrence and the most extensive distribution were Reticulaphis fici (on Ficus microcarpa), Icerya purchasi (on Erythrina variegata) and Pealius liquidambari (on Liquidambar formosana). Tree species and insect species that require special attention are discussed. It is also suggested that insects and pathogens should be considered in designing street trees.
