To explore whether these signalling components also contribute to reduced aphid infestation and P. capsici infection on siz1‐2, we performed aphid infestation and infection assays on Arabidopsis siz1‐2/eds1‐2, siz1‐2/pad4‐1 and siz1‐2/snc1‐11 double mutants. Here, PADI4 is linked to infection.