The present invention relates to a powdery mildew-resistant Cucumis sativus plant, comprising in its genome a necrosis-suppressing genetic factor, which plant is both resistant to powdery mildew and is necrosis-free. The invention further relates to a method for obtaining a powdery mildew-resistant and necrosis-free Cucumis sativus plant, comprising of introducing a necrosis-suppressing genetic factor into the genome of a powdery mildew-resistant plant.