Ascochyta (Mycosphaerella) pea blight, caused by Mycosphaerella pinodes, is one of the most important diseases of grain legumes worldwide. Despite the economic impact and numerous studies on this disease, little is known about the cytological features during infection, especially in resistant interactions. One reason is the lack of resistant cultivars of pea, as well as the available resources in the Pisum germplasm collection with strong resistance to this disease.