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Table S1 Results (generalized linear models) of aphid (Aulacorthum solani), hemiparasite (Rhinanthus serotinus) and host grass (Lolium pratense) performance in choice experiment. Cultivar factor included in the model. Significant values shown in bold. n.s., not significant.

Figure S1 Aphid (Aulacorthum solani) herbivore performance on hemiparasite (Rhinanthus serotinus) of grass host (Lolium pratense). Back-transformed estimates of least-squares means and 95% confidence limits of numbers of aphids on hemiparasites parasitizing on endophyte-infected (E+), endophyte-free (E-) and manipulatively endophyte-free (ME-) host grass cultivars Kasper and Old at the end of the experiments. A: choice experiment, B: no-choice experiment. *P < 0.05; **P < 0.01; ***P < 0.001. Statistics for no-choice experiment: endophyte: d.f. = 2, χ2 = 18.40, P = 0.0001; cultivar: d.f. = 1, χ2 = 3.51, P = 0.06; endophyte x cultivar: d.f. = 2, χ2 = 0.88, P = 0.64.

Figure S2 Grass host (Lolium pratense) and hemiparasitic plant (Rhinanthus serotinus) performance in choice experiment. Back-transformed estimates of least-squares means and 95% confidence limits of biomass (A) and number of flowers (B) of hemiparasite parasitizing endophyte-infected (E+) and endophyte-free (E-) host grass cultivars Kasper and Old and (C) biomass of parasitized and non-parasitized host grass cultivars at the end of the experiment. *P < 0.05; **P < 0.01; ***P < 0.001.

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