Field resistance to bacterial canker in some cherry seedling populations

In 9–13 year old cherry seedling populations, totalling 1,033 individuals, a preliminary selection was made in 1963, for field resistance to bacterial canker (Pseudomonas syringae van Hall).The field resistance of the three cherry species used, P. avium, P. cerasus and P. avium × P. cerasus, has shown to be low, high and very high, respectively.