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The sycamore lace bug, <i>Corythucha ciliata</i> (Say) is a highly invasive pest insect that feeds on sycamore trees (<i>Platanus</i> spp.) worldwide. The interaction between <i>Platanus</i> species and this insect pest has not yet been studied at the molecular level. Therefore, a recent study was conducted to compare the gene expression and metabolite profiles of <i>Platanus acerifolia</i> leaves in response to <i>C. ciliata</i> feeding damage after 24 and 48 h. We employed high throughput RNA sequencing (RNA- seq) to identify a total of 2,828 significantly differentially expressed genes (DEGs) after <i>C. ciliata</i> feeding. In addition, 303 unigenes were found to be up-regulated at both time points. Moreover, Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis showed that monoterpenoid biosynthesis, the linoleic acid metabolism pathway, and alpha- linolenic acid metabolism were the most prominent pathways among the DEGs. Further analysis of the metabolite profiles showed that nine metabolites were significantly different before and after <i>C. ciliata</i> damage. In addition, we analyzed DEGs detected in the <i>P. acerifolia</i> and <i>C. ciliata</i> interaction using Mapman. The terpene synthase gene family was also identified. We suggest that the results obtained from DEGs and metabolite analysis can provide important information for the identification of genes involved in the <i>P. acerifolia</i>&#8722;<i>C. ciliata</i> interaction, which might be necessary for controlling <i>C. ciliata</i> efficiently.