Data from: Geographic distribution of terpenoid chemotypes in Tanacetum vulgare mediates tansy aphid occurrence but not abundance

# Data from: Geographic distribution of terpenoid chemotypes in Tanacetum vulgare mediates tansy aphid occurrence but not abundance [https://doi.org/10.5061/dryad.9p8cz8wqk](https://doi.org/10.5061/dryad.9p8cz8wqk) ## Description of the data and file structure We collected the plant morphological and insect data (e.g. plant height, stems, aphid species (**Aphid occurrence**), counts (**Me.occ**), etc.) in 26 different sites from north to south Germany. We then used the plants for chemical analysis by using gas chromatography/mass spectrometry (GC-MS). The detected terpenoids were identified by using the National Institute of Standards and Technology (NIST), Mass Spectral Library (NIST 11). The quantification of the compounds was performed based on the dilutions of the external standards: sabinene, α-pinene, linalool, methylsalicylate, β-caryophyllene, α-humulene, geraniol, and bornyl acetate at different concentrations (pmol/g). We clustered the plants (**Sample ID**) into monoterpenoid (**Monoterpenoid (MT) classes**) and sesquiterpenoid (**Sesquiterpenoid (ST) classes**) chemotype classes. Plants that were not analyzed for chemical analysis are reported as "NA" in the dataset. ## Code/Software We used "vegan", "adegenet", "chemodiv", "emmeans" and "car" packages in R