Model describing possible molecular mechanisms related to host response following biocontrol agent (Metschnikowia fructicola) application. ABA, abscisic acid; BR, brassinosteroid; CAT, catalase; C4H, trans‐cinnamate 4‐monooxygenase; CHI, chitinase; 4CL, 4‐coumarate‐CoA ligase; GA, gibberellic acid; GLU, β‐1,3‐glucanase; MAPK, mitogen‐activated protein kinase; MAPKK, mitogen‐activated protein kinase kinase; PAL, phenylalanine ammonia‐lyase; POD, peroxidase; Rbo, Respiratory burst oxidase; ROS, reactive oxygen species; SOD, superoxide dismutase.