Mean aphid population score (1: <20 aphids to 5: >250 aphids per plant) and mean plant damage score (1: no visual damage to 5: dead plant) for M. truncatula lines ‘Cyprus’ and ‘Caliph’ (A and B) and ‘Borung’ and ‘Mogul’ (C and D) over a time course of observations following PA (A. pisum) infestation. E and F, Mean aphid weight (mg) per plant (E) and mean plant dry weight (g; F) for all four M. truncatula lines at day 15. Values are mean and se of six biological replicates.