Abstract: Taking some garden trees such as Bischofia javanica Bl.,Lagerstroemia speciosa（L.） Pers.,Bauhinia variegata L. and Ficus microcarpa Linn. f. as research materials,the applications of trunk injection in maintenance of garden trees were studied. The results showed that trunk injection of imidacloprid could effectively prevent Coloana cinerea Dworakowska, and the higher concentrations of injecting,the more effective against pests. Both trunk injection 20% of the original drug and diluted 2.5 times,the efficacy period reached 226 days,the duration of efficacy was long. Whether it was normal growth of Lagetstroemia specious,or newly transplanted Bauhinia blakeana,trunk injection of ‘Guoguang Shitahuo’ was able to promote its germination. Trunk injection of growth regulator could promote the germination of Ficus microcarpa. Trunk injection is a simple operation,economic and environmental protection methods,which is a worthy to popularize technology in maintenance of garden trees.

Key words: garden tree, trunk injection, pest control, promoting germination