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The aim of the study was to determine the correlation between the mechanical resistance of iris seed capsules and seeds to <i>Mononychus punctumalbum</i> foraging. The principal component analysis (PCA) demonstrated that the first main component referred to the variety type in 68%, and the second main component described the stage of the ontogenetic development of the plant in 26%. As indicated by the values of each parameter measured, all the parameters were found to exert a strong impact on the variability of the analyzed system. The occurrence of weevil infestation was also strongly but negatively correlated with seed wall thickness and capsule wall thickness. There was a correlation of seed max load and seed mass with the occurrence of the weevil. The analysis of the mechanical resistance of iris seed capsules (in June 9.28 N and September 6.27 N for <i>I. sibirica</i> and in June 6.59 N and September 2.94 N for <i>I. aphylla</i>) and seeds (in June 15.97 N and September 344.90 N for <i>I. sibirica</i> and in June 16.60 N and September 174.46 N for <i>I. aphylla</i>) showed significant differences between the terms and species. The PCA analysis revealed that the first variable was correlated with the occurrence of weevil foraging.