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Fig. S1 Bioassay to test preferences for cucumber leaves or paper disks with leaf extracts by laboratory colonies of leaf-cutting ants (Atta colombica).

Fig. S2 Chemical composition of volatile mixtures of ant-cut leaf pieces.

Fig. S3 Chemical composition of chloroform extracts of leaf surfaces.

Fig. S4 Plots of the amount of micronutrients, macronutrients and aluminum (Al) in Cucumis sativus leaves against the estimated density of Colletotrichum tropicale in sampled plants.

Table S1 Composition of volatile compounds detected in ant-cut leaf pieces of Cucumis sativus sampled with solid-phase microextraction (SPME)

Table S2 Composition of chloroform extracts of Cucumis sativus leaf surfaces