Table S2. Occurrence and herbivore pressure of 27 non-native plant species in 28 sites in field survey across North China. Species with asterisks were used in the common garden experiment, bioassay and chemical analysis. The difference in the percentage of damaged leaf (binary data for undamaged vs. damaged leaves in a cbind matrix) among sites was tested using a Wald Chi-square test applied on a Generalized Linear Model (GLM) with a binomial distribution. Each non-native species was analyzed separately.